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Contents Wiring diagrams Section: Entertainment Systems All sections

Cellular System, Entertainment System, and Navigation System Buick Regal V

Entertainment Systems 34 illustrations ~30215 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Radio Antenna Coil Fastener8 N.m70 lb in
Radio Antenna Module Fastener9 N.m80 lb in
Video Display Fastener9.5 N.m84 lb in

Fastener Tightening Specifications

Scheme 1

Scheme 1: Power, Ground, Serial Data and Antennas Wiring Schematics
Scheme 1: Power, Ground, Serial Data and Antennas Wiring Schematics

Scheme 2

Scheme 2: Amplifier Inputs (UQA) Wiring Schematics
Scheme 2: Amplifier Inputs (UQA) Wiring Schematics

Scheme 3

Scheme 3: Speakers (U65) Wiring Schematics
Scheme 3: Speakers (U65) Wiring Schematics

Scheme 4

Scheme 4: Speakers (UQA) Wiring Schematics
Scheme 4: Speakers (UQA) Wiring Schematics

Scheme 5

Scheme 5: Auxiliary Inputs (UEW) Wiring Schematics
Scheme 5: Auxiliary Inputs (UEW) Wiring Schematics

Scheme 6

Scheme 6: Controls and Display Wiring Schematics
Scheme 6: Controls and Display Wiring Schematics

Scheme 7

Scheme 7: Power, Ground, Serial Data, Antennas, and Microphone Wiring Schematics
Scheme 7: Power, Ground, Serial Data, Antennas, and Microphone Wiring Schematics

Scheme 8

Scheme 8: Controls and Outputs Wiring Schematics
Scheme 8: Controls and Outputs Wiring Schematics

Diagnostic Code Index

DTCDescription
DTC B0000DTC B0000 5A Vehicle Speed Information Circuit Not Plausible
DTC B0997DTC B0997 00 Info Display Module Malfunction
DTC B1020DTC B1020 00 Auxiliary Electronic Control Unit (ECU) Performance
DTC B1025, B1035, B1045, or B1055DTC B1025 01 Left Front Audio Output Circuit Short to Battery DTC B1025 02 Left Front Audio Output Circuit Short to Ground DTC B1025 04 Left Front Audio Output Circuit Open DTC B1035 01 Front Audio Output Circuit Short to Battery DTC B1035 02 Right Front Audio Output Circuit Short to Ground DTC B1035 04 Right Front Audio Output Circuit Open DTC B1045 01 Left Rear Audio Output Circuit Short to Battery DTC B1045 02 Left Rear Audio Output Circuit Short to Ground DTC B1045 04 Left Rear Audio Output Circuit Open DTC B1055 01 Right Rear Audio Output Circuit Short to Battery DTC B1055 02 Right Rear Audio Output Circuit Short to Ground DTC B1055 04 Right Rear Audio Output Circuit Open
DTC B125ADTC B125A 02 Antenna Signal Circuit Short to Ground DTC B125A 04 Antenna Signal Circuit Open Circuit
DTC B125CDTC B125C 01 Satellite Antenna Circuit Short to Battery DTC B125C 02 Satellite Antenna Circuit Short to Ground DTC B125C 04 Satellite Antenna Circuit Open
DTC B1265DTC B1265 02 Switched 14 Volt Performance Short to Ground
DTC B1271DTC B1271 00 Theft Protection Active
DTC B1278 or B1279DTC B1278 01 Left Auxiliary Input Signal Circuit Short to Battery DTC B1278 02 Left Auxiliary Input Signal Circuit Short to Ground DTC B1279 01 Right Auxiliary Input Signal Circuit Short to Battery DTC B1279 02 Right Auxiliary Input Signal Circuit Short to Ground
DTC B1287DTC B1287 01 Amplifier Control Signal Circuit Short to Battery DTC B1287 02 Amplifier Control Signal Circuit Short to Ground DTC B1287 04 Amplifier Control Signal Circuit Open
DTC B1446 or B1447DTC B1446 03 Replace Backup Power Source Voltage Below Threshold DTC B1447 04 Backup Power Source Open Circuit
DTC B2455DTC B2455 02 Cellular Phone Microphone Circuit Short to Ground DTC B2455 04 Cellular Phone Microphone Circuit Open
DTC B2462DTC B2462 01 Global Positioning System Short to Battery DTC B2462 02 Global Positioning System Short to Ground DTC B2462 04 Global Positioning System Open
DTC B2470DTC B2470 02 Cellular Phone Antenna Circuit Malfunction Short to Ground DTC B2470 04 Cellular Phone Antenna Circuit Malfunction Open Circuit
DTC B2476 or B2482DTC B2476 04 Cellular Phone Select Service Switch Open DTC B2476 59 Cellular Phone Select Service Switch Protection Time-out DTC B2482 00 Cellular Phone Select Service Switch Range/Performance
DTC B2485DTC B2485 02 Wireless Communication (BT) Antenna Circuit Short to Ground DTC B2485 04 Wireless Communication (BT) Antenna Circuit Open
DTC B2625DTC B2625 01 Display Dimming Pulse Width Modulation (PWM) Output Circuit Short to Voltage DTC B2625 02 Display Dimming Pulse Width Modulation (PWM) Output Circuit Short to Ground DTC B2625 04 Display Dimming Pulse Width Modulation (PWM) Output Circuit Open

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Vehicle Speed SignalB0000 5AB0000 5AB0000 5AB0000 5A

Circuit/System Description

The radio receives a vehicle speed signal from the electronic brake control module in order to correlate actual vehicle speed to the movement of the vehicle calculated by the navigation system and reported serial data.

Conditions for Running the DTC

  1. Radio ON.
  2. Battery voltage must be between 9-16 V.

Conditions for Setting the DTC

  1. Vehicle speed from serial data is more than 5 km/h (3 mph) and vehicle speed pulse from the electronic brake control module is 0 km/h (0 mph).
  2. Vehicle speed calculated from the navigation processing software is more than 36 km/h (22 mph) and vehicle speed pulse from the electronic brake control module is 0 km/h (0 mph) for 10 seconds continuously.

Action Taken When the DTC Sets

  1. Turn by turn route navigation may be inoperative.
  2. Vehicle indicated location may be inaccurate.

Conditions for Clearing the DTC

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Note. Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.

  1. Ignition OFF, disconnect the X4 harness connector at the A11 radio.
  2. Ignition ON, operate the vehicle drive wheels at 5 mph. Test for 3-7 Hertz between the signal circuit terminal 20 and ground. If not within the specified range, test the signal circuit terminal 20 for an open, high resistance, short to ground or short to voltage. If the circuit tests normal replace the K17 electronic brake control module.
  3. If the circuit tests normal, replace the A11 radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio or electronic brake control module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The radio communicates with the information display via serial data. This DTC indicates a fault in the information display. No external circuits are involved. The radio and display may continue to operate normally when this DTC is set.

  1. Ignition is ON or in the ACC position.
  2. The system voltage is at least 9.5 V and no more than 15.5 V.
  3. All the above conditions are present for greater than 10 seconds.

The radio receives an improper status response indicating an internal ECU fault in the information display.

No action is taken.

  1. A current DTC clears when the radio receives a proper status response message back from the information display.
  2. A history DTC clears after 50 malfunction-free ignition cycles.

Diagnostic Aids

  1. This DTC may be stored as a history DTC without affecting the operation of the information display.
  2. If stored only as a history DTC and not retrieved as a current DTC, do not replace the information display.
  3. If this DTC is retrieved as both a current and history DTC, replace the information display.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

If this DTC is retrieved as a current DTC, replace the information display.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The radio communicates with the radio controls via serial data. This DTC indicates a fault in the radio controls. No external circuits are involved. The radio may continue to respond normally to faceplate functions when this DTC is set.

  1. Ignition is ON or in the ACC position.
  2. The system voltage is at least 9.5 V and no more than 15.5 V.
  3. All the above conditions are present for greater than 10 seconds.

The radio receives an improper status response indicating an internal ECU fault in the radio controls.

No action is taken.

  1. A current DTC clears when the radio receives a proper status response message back from the radio control assembly.
  2. A history DTC clears after 50 malfunction-free ignition cycles.
  1. This DTC may be stored as a history DTC without affecting the operation of the radio controls.
  2. If stored only as a history DTC and not retrieved as a current DTC, do not replace the radio controls.
  3. If this DTC is retrieved as both a current and history DTC, replace the radio controls.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC B1020 is not set. If DTC B1020 is set Replace the A22 radio controls. If DTC B1020 is not set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for radio controls replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Left Front Audio Signal CircuitB1025 02*B1025 04**B1025 01*
Right Front Audio Signal CircuitB1035 02*B1035 04**B1035 01*
Left Rear Audio Signal CircuitB1045 02*B1045 04**B1045 01*
Right Rear Audio Signal CircuitB1055 02*B1055 04**B1055 01*
* Noticeable audio distortion possible. ** No or reduced sound from speaker.

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

  1. Ignition is ON or in the ACC position
  2. The system voltage is 9-16 V
  3. The test is run once during radio wake up

B1025 01, B1035 01, B1045 01, B1055 01

The radio detects a short to voltage on the specified audio (+) or (-) circuit.

B1025 02, B1035 02, B1045 02, B1055 02

The radio detects a short to ground on the specified audio (+) or (-) circuit.

B1025 04, B1035 04, B1045 04, B1055 04

The radio detects an open on the specified audio (+) or (-) circuit.

The radio continues to send the output signal to the speaker signal circuit with the current fault.

  1. A current DTC clears when the conditions for setting the DTC are no longer present and the ignition has been cycled from OFF to ON.
  2. A history DTC clears after 50 malfunction-free ignition cycles.

Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, A11 radio ON, mute OFF.
  2. Verify clear audio is heard from each speaker, adjusting fade and balance controls to test each speaker individually. If audio is inoperative from one or more speakers, or the audio emitted is not clear. Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If clear audio is heard from all speakers.
  3. All OK.
  1. Ignition OFF, disconnect the harness connector at the appropriate P19 speaker. Ignition ON, A11 radio ON, mute OFF.
  2. Test for 5-7 V between each audio signal circuit terminal 1 and terminal 2 and ground. If less than 5 V Ignition OFF, disconnect the X1 harness connector at the A11 radio. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the A11 radio. If greater than 7 V Ignition OFF, disconnect the X1 harness connector at the A11 radio. Ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the A11 radio. If between 5-7 V
  3. Test or replace the P19 speaker.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Speaker Replacement Reference»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Radio Antenna CoaxB125A 02B125A 041
Ground1
1. May exhibit possible AM/FM interference.

The antenna amplifier receives both AM and FM signals from the rear glass antenna. The radio antenna amplifier is enabled when the radio is turned on. The radio provides battery voltage to the antenna amplifier using the center conductor of the antenna coaxial cable. When a 12 V signal is seen by the module on the center conductor of the antenna coax, both AM and FM signals are amplified.

  1. Ignition ON.
  2. Battery voltage must be between 9-16 V.

B125A 02

The radio detects a short to ground in the antenna signal circuit center conductor.

B125A 04

The radio detects an open in the antenna signal circuit center conductor.

Radio reception may be poor or not available.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clears after 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, A11 radio ON, tune to a strong AM or FM station. Verify that the AM or FM reception is clear.

  1. Ignition OFF, disconnect the radio antenna coax from the A11 radio and from the radio antenna amplifier.
  2. Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax.
  3. Test for less than 5 ohms on the antenna coax center circuit from end to end. If greater than the specified range, replace the antenna coax.
  4. Ignition ON, test for less than 1 V between the antenna coax center terminal and ground. If greater than the specified range, replace the antenna coax.
  5. Test for infinite resistance between the coax center terminal and the outer shield. If less than the specified value, replace the antenna coax.
  6. Connect the antenna coax to the A11 radio. Test for 12-15 V between the antenna coax center terminal and ground at the radio antenna amplifier connector. If not within the specified range, replace the A11 radio.
  7. If all circuits test normal, replace the radio antenna amplifier.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Radio Antenna Amplifier Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. The digital radio receiver is connected to the digital radio antenna via a shielded coax cable. The digital radio antenna contains an amplifier which is powered by the radio through the coax cable.

This DTC is run every 300 milliseconds.

The radio detects a circuit fault in the digital radio antenna.

The radio displays No XM Signal or Check Antenna.

  1. A current DTC clears when the condition for setting the DTC is no longer present.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

The digital radio antenna requires a clear line of sight to the sky to operate properly. Reception may be limited, intermittent, or unavailable inside structures.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

EL-48028 Digital Radio Test Antenna

  1. With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM.
  2. Verify DTC B125C is not set as current and the No XM Signal message is not displayed on the radio. If DTC B125C is set as current or the No XM Signal message is displayed. Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If DTC B125C is not set as current and the No XM Signal message is not displayed.
  3. All OK.
  1. Ignition OFF, disconnect the digital radio antenna coax cable from the A11 radio. Connect the EL-48028 digital radio test antenna to the radio and place on the roof of the vehicle.
  2. Ignition ON, radio tuned to XM channel 1.
  3. Verify DTC B125C is not set as current and XM reception is improved. If DTC B125C is set as current or XM reception is not improved Replace the A11 radio. If DTC B125C is not set as current and XM reception is improved
  4. Ignition OFF, disconnect the digital radio antenna coax cable from the T4G cellular phone, navigation, and digital radio antenna.
  5. Verify the digital radio antenna coax cable passes the coax cable component test. Refer to Component Testing. If the coax cable does not pass the test Replace the antenna coax cable If the coax cable passes the test
  6. Test or replace the T4G cellular phone, navigation, and digital radio antenna.

Component Testing

CAUTIONRefer to Test Probe Caution .

Note. Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

  1. Ignition OFF, disconnect the coax cable at both components.
  2. Test for less than 5 ohms between coax cable center terminal end to end. If 5 ohms or greater Replace the coax cable If less than 5 ohms
  3. Test for less than 5 ohms between the coax cable outer shield end to end. If 5 ohms or greater Replace the coax cable If less than 5 ohms
  4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. If less than infinite resistance Replace the coax cable If infinite resistance
  5. All OK

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Radio Antenna Base Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the radio is on, or when audio ouput is needed fro chimes, a discrete 12 V signal is supplied on the entertainment remote enable circuit from the radio to the audio amplifier. This signal is used to control the power state of the amplifier.

  1. The radio is ON.
  2. The system voltage is 9 -16 V
  1. The radio detects a short to ground on the entertainment remote enable circuit circuit.
  2. The above condition is present for greater than 250 mS.
  1. The radio implements a current limiting mode and disables the output on the entertainment remote enable circuit.
  2. All components connected on the entertainment remote enable circuit will be inoperative.
  1. The condition for setting the DTC no longer exists.
  2. After the ignition has been OFF for a sufficient amount of time to allow the radio to enter a low power/sleep state, the radio will re-enable the output on the following ignition cycle and the DTC will become history.
  3. A history DTC clears after 50 malfunction-free ignition cycles.
  1. This DTC may be stored as a history DTC without affecting the operation of the radio/infotainment systems.
  2. The radio's current limiting logic will not re-enable the output on the entertainment remote enable circuit until after the radio performs a full power-down. It may be necessary to wait 5 minutes between each test attempt with the key OFF and retained accessory power OFF.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, radio OFF, radio B+ fuse removed, disconnect the X3 connector at the T3 audio amplifier.
  2. Reinstall the radio B+ fuse. Ignition ON, radio ON, verify that a test lamp illuminates between the entertainment remote enable circuit Audio Amplifier X3 terminal 13 and ground. If the test lamp does not illuminate, test the entertainment remote enable circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the Radio.
  3. If all circuits test normal, replace the T3 audio amplifier.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for radio and amplifier replacement, programming, and setup

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the radio is initially installed in the vehicle, the radio receives VIN information via serial data. The radio stores a portion of the VIN and compares this sequence to the VIN information received each time the radio powers on. The VIN in the radio is a single one-time learn.

The radio theft deterrent system is intended to disable or limit radio functionality if incorrect vehicle information is received by the radio. The radio disables functionality if the VIN information received by the radio does not match the VIN information that has been learned by the radio. This DTC is generated by the module when the Theft Protection is activated.

This DTC test runs when the radio changes from OFF to ON.

The radio has learned a correct VIN sequence and the VIN information received via serial data does NOT match the learned VIN sequence.

The radio may be disabled or have limited functionality. The radio display will indicate that theft protection is active.

The radio receives the correct VIN information via serial data.

A possible cause of incorrect VIN info could be the radio was originally installed in another vehicle.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC B1271 is not set. If DTC B1271 is set Replace the A11 radio. If DTC B1271 is not set
  3. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for radio replacement, programming, and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+4
Detection Signal Circuit455
Left Audio Signal Terminal 12B1278 02, 33B1278 01, 3
Left Audio Signal Terminal 14333
Right Audio Signal Terminal 13B1279 02, 22B1279 01, 2
Right Audio Signal Terminal 15222
Audio Common Circuit1
Ground4
1. No or distorted audio from both sides 2. No or distorted right side audio 3. No or distorted left side audio 4. External audio inputs inoperative 5. AUX selection always available with or without device connected

A remote 3.5 mm auxiliary stereo jack allows playback of audio signals from remote devices (e.g., laptop computer, IPOD, MP3 player, etc.). The auxiliary audio jack has an internal mechanical detection switch. The switch is normally closed, connecting the detection circuit to the audio common circuit. When a device is inserted to the auxiliary audio jack, the switch opens and the multimedia player interface module detects a high voltage on the detection circuit. A serial data message is sent to the radio, the radio will switch to AUX as the audio source. The multimedia player interface module receives the analog audio signals from the connected device and sends the signals to the radio.

  1. Ignition in RUN or ACC position.
  2. The system voltage is at least 9.5 V and no more than 15.5 V.
  3. The multimedia player interface module detects a device has been connected to the auxiliary audio input jack.

B1278 01, B1279 01

  1. The multimedia player interface module detects a short to battery on either of the audio signal circuits from the auxiliary audio jack.
  2. The condition is present for greater than 250 mS.

B1278 02, B1279 02

  1. The multimedia player interface module detects a short to ground on either of the audio signal circuits from the auxiliary audio jack.
  2. The condition is present for greater than 250 mS.

No or reduced audio is heard from the remote audio device.

  1. The conditions for setting the DTC are no longer present on the auxiliary input signal circuits.
  2. A history DTC clears after 50 malfunction-free ignition cycles.
  1. Playback of an audio device that is connected to the 3.5 mm jack can only be controlled using the controls on the device.
  2. The volume control on the device may need to be adjusted to ensure sufficient playback volume through the infotainment system.
  3. This DTC may be stored as a history DTC without affecting the operation of the module.
  4. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X1 harness connector at the X83 auxiliary audio input.
  2. Ignition ON, test for less than 1 V between the terminals listed below and ground: Signal terminal 1 Signal terminal 2 If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the T11 multimedia player interface module.
  3. Ignition OFF, test for infinite resistance between the terminals listed below and ground: Signal terminal 1 Signal terminal 2 If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the T11 multimedia player interface module.
  4. If all of the circuits test normal, replace the X83 auxiliary audio input.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References multimedia player interface module replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Amplifier ControlDTC B1287 02,**DTC B1287 04,**DTC B1287 01,*
* No audio output. ** 4 Channel unmute, possible noise in speakers when radio muted or turned off

The radio amplifier control circuit provides varying pulse width modulated (PWM) signals to control overall muting of the amplifier. The PWM signals are varying duty cycle percentages ranging from 0-100 percent. A low duty cycle unmutes all amplifier channels and a high duty cycle mutes all amplifier channels. The amplifier control circuit will measure less than 1 V when the mute function is OFF, and approximately 8 V DC when at full mute. The radio monitors the amp control circuit for faults.

The following are conditions that must be present in order for the radio to enable the diagnostics.

  1. The radio is in ACCESSORY, RUN, or RAP power mode.
  2. The system voltage ist 9-16 V.
  3. The radio performs the test once during wakeup.

The radio detects a fault on the amplifier control circuit 400 ms after radio activates the remote enable circuit.

Radio sets the DTC and continues to output correct state.

  1. The condition must be corrected.
  2. A history DTC clears after 100 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the X3 harness connector at the T3 amplifier.
  2. Ignition ON, radio ON, mute ON, test for 7.5-8.5 V between the amplifier control circuit terminal 6 and ground. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  3. Mute OFF, test for less than 1 V between the amplifier control circuit terminal 6 and ground. If greater than the specified range, replace the A11 radio.
  4. If all circuits test normal, replace the T3 amplifier.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio and amplifier replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Backup Battery B+B1446 03B1447 04
Backup Battery Low Reference

The backup power source provides voltage to the telematics communication interface control module, to be able to successfully place a call in the event of a main battery disconnect during a collision event.

B1446 03

  1. Ignition is in the RUN or ACC position.
  2. System voltage is between 9.5 and 15.5 V.
  3. DTC B1447 is not set.

B1447 04

  1. Ignition is in the RUN or ACC position.
  2. System voltage is between 9.5 and 15.5 V.
  3. The above conditions are present for greater than 10 seconds.

B1446 03

The telematics communication interface control module detects that the backup power source voltage has dropped below the minimum threshold value.

B1447 04

The telematics communication interface control module detects no voltage from the backup power source.

B1446 03

The OnStar® status LED turns red.

B1447 04

  1. The OnStar® status LED turns red.
  2. The telematics communication interface control module will be unable to place a call in the event of a main battery disconnect during a collision event.
  1. A current DTC B1446 will clear when the telematics communication interface control module detects the voltage of the backup power source is above the minimum threshold value.
  2. A current DTC B1447 will clear when the telematics communication interface control module detects voltage from the backup power source.
  3. A history DTC clears after 50 malfunction-free ignition cycles.
  1. Shorting the backup power source positive voltage circuit to the backup power source ground circuit or chassis ground will activate the internal circuit protection of the backup power source, rendering the backup power source inoperable.
  2. DTC B1447 may set if the K73 telematics communication interface control module has been incorrectly disconnected or serviced. When disconnecting the K73 telematics communication interface control module, disconnect the harness connector X1 at the K73 telematics communication interface control module prior to disconnecting any other harness connectors. This will ensure the backup power source is preserved when voltage is removed from the K73 telematics communication interface control module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  2. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  3. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  4. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the C3 telematics communication interface control module battery. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal B and ground. If 10 ohms or greater Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for less than 2 ohms in the low referencce circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If less than 10 ohms
  3. Test for 15.5 V or less between the battery positive voltage circuit terminal A and low reference terminal B. If greater than 15.5 V Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the battery positive voltage circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the battery positive voltage circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If 15.5 V or less
  4. Test or replace the C3 telematics communication interface control module battery.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Communication Interface Module Battery Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Microphone SignalB2455 02B2455 04
Cellular Microphone Low ReferenceB2455 041
1. OnStar Microphone Inoperative - Caller Cannot Be Heard

The telematics communication interface control module provides the cellular phone microphone with a supplied voltage on the cellular phone microphone signal circuit. When the microphone is in use, voice data from the user is sent back to the telematics communication interface control module on the signal circuit. The telematics communication interface control module provides a ground for the cellular phone microphone via the low reference wire.

  1. The ignition must be in the RUN or ACC position.
  2. The system voltage is at least 9.5 V and no more than 15.5 V.
  3. All the above conditions are present for greater than 10 seconds.

B2455 02

The telematics communication interface control module detects an short to ground in the cellular phone microphone signal circuit for 10 seconds or greater.

B2455 04

The following conditions will set this DTC

  1. The telematics communication interface control module detects an open/high resistance in the cellular phone microphone signal circuit for 10 seconds or greater.
  2. The telematics communication interface control module detects an open/high resistance in the low reference circuit for 10 seconds or greater.
  1. The OnStar® status LED turns red.
  2. The telematics communication interface control module will not receive a signal from the cellular phone microphone.
  3. Calls can be placed but the caller cannot be heard.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. It is necessary to have the vehicle in a quiet, open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

  1. Ignition ON.
  2. Verify that DTC B2455 is set. If DTC B2455 is not set Refer to «OnStar Microphone Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If DTC B2455 is set
  3. Verify that your voice is heard clearly by the OnStar Call Center after completing a blue button press. If your voice can not be heard clearly Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If your voice can be heard clearly
  4. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B24 cellular phone microphone. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal A and ground. If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If less than 10 ohms
  3. Ignition ON.
  4. Test for 9.5-10.5 V between the signal circuit terminal B and ground. If less than 9.5 V Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 10.5 V Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If between 9.5-10.5 V
  5. Test or replace the B24 cellular phone microphone.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mobile Telephone Microphone Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The navigation antenna is connected to the telematics communication interface control module and the radio through the navigation signal splitter. The navigation signal splitter distributes the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter. The radio supplies 5 V through the center conductor of the coax cable to power the splitter.

  1. Radio On.
  2. System voltage is greater than 9 V and less than 16 V.
  3. The navigation radio tests the GPS antenna every 10 seconds.

B2462 01

The navigation radio detects a short to B+ on the GPS antenna signal circuit.

B2462 02

The navigation radio detects a short to ground on the GPS antenna signal circuit.

B2462 04

The navigation radio detects an open/high resistance on the GPS antenna signal circuit.

  1. The radio uses the last reported position and the vehicle speed signal to calculate the vehicle position.
  2. Route guidance may be inaccurate.
  3. Turn by turn navigation may be inaccurate or inoperative.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
  1. This DTC can only be retrieved from the radio. The telematics communication interface control module does not set this DTC.
  2. The radio only monitors the connection between the navigation signal splitter and the radio. The radio cannot detect faults between the signal splitter and the navigation antenna. Faults between the signal splitter and the navigation antenna will result in a loss of GPS signal without setting DTC B2462.
  3. The navigation antenna requires a clear line of sight to the sky to operate properly. The GPS may have limited, intermittent, or no reception near tall buildings or inside structures.

Schematic Reference

  1. «OnStar Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio/Navigation System Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Connector End View Reference

Description and Operation

  1. «OnStar Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation)
  2. «Radio/Audio System Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__radioaudio-system-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit

  1. Ignition OFF, disconnect the navigation antenna coax cable connector at the A11 radio. Connect the «EL-49903»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) to the A11 radio, place the test antenna on the roof of the vehicle.
  2. Ignition ON, radio ON, navigation selected.
  3. Verify DTC B2462 is not set. If DTC B2462 is set replace the A11 radio. If DTC B2462 is not set
  4. Ignition OFF, disconnect the radio navigation coax cable at the T15 navigation signal splitter.
  5. Verify the radio navigation coax cable passes the coax cable component test. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable If the coax cable passes the test
  6. Test or replace the T15 navigation signal splitter.
CAUTIONRefer to Test Probe Caution .

Note. Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

  1. Ignition OFF, disconnect the coax cable at both components.
  2. Test for less than 5 ohms between coax cable center terminal end to end. If 5 ohms or greater Replace the coax cable If less than 5 ohms
  3. Test for less than 5 ohms between the coax cable outer shield end to end. If 5 ohms or greater Replace the coax cable If less than 5 ohms
  4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. If less than infinite resistance Replace the coax cable If infinite resistance
  5. All OK

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Navigation Signal Splitter Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, programming, and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Antenna SignalB2470 02B2470 04

The cellular phone and navigation antenna is connected to the telematics communication interface control module. This module supplies 5 V to the cellular phone and navigation antenna to power the internal amplifier. When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the GPS signal to both the telematics communication interface control module and the navigation radio. The navigation radio supplies 5 V through the GPS antenna coaxial cable to the navigation signal splitter to power the internal navigation radio signal amplifier.

  1. Ignition in the RUN or ACC position.
  2. System voltage is between 9.5 V and 15.5 V.
  3. The above conditions are present for greater than 1 second.

The telematics communication interface control module does not detect the presence of a cellular phone antenna.

  1. The vehicle is unable to connect to the OnStar® Call Center.
  2. The OnStar® status LED turns red.
  1. The telematics communication interface control module detects the presence of a cellular phone antenna.
  2. A history DTC clears after 50 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit

Note. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition ON.
  2. Verify that DTC B2470 is not set. If DTC B2470 is set Refer to «Circuit/System Testing (without Navigation Radio)»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__circuitsystem-testing-without-navigation-radio) If DTC B2470 is not set
  3. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to connect with the OnStar Call Center. Refer to «Unable to Contact OnStar Call Center»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If able to connect with the OnStar Call Center
  4. All OK.

Circuit/System Testing (without Navigation Radio)

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface control module. Place the test antenna on the roof of the vehicle.
  3. Verify the DTC does not set while operating the vehicle within the conditions for running the DTC. If the DTC sets Replace the K73 telematics communication interface control module. If the DTC does not set
  4. Ignition OFF.
  5. Disconnect the EL-49903 GM OnStar antenna diagnostic tool kit from the K73 telematics communication interface control module If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  6. Test or replace the T4G cellular phone, navigation, and digital radio antenna.

Circuit/System Testing (with Navigation Radio)

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface control module. Place the test antenna on the roof of the vehicle.
  3. Verify the DTC does not set while operating the vehicle within the conditions for running the DTC. If the DTC sets Replace the K73 telematics communication interface control module. If the DTC does not set
  4. Ignition OFF, connect the coax cable to the K73 telematics communication interface control module and disconnect the coax cable from the T15 navigation signal splitter.
  5. Ignition ON.
  6. Test for 4.5-5.5 V between the coax cable center conductor and the outer shield. If greater than 5.5 V Test or replace the coax cable. If less than 4.5 V Test or replace the coax cable. If between 4.5-5.5 V
  7. Ignition OFF.
  8. Test the coax cable between the T15 navigation signal splitter and the T4G cellular phone, navigation, and digital radio antenna. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  9. Test or replace the T15 navigation and signal splitter.
CAUTIONRefer to Test Probe Caution

Note. Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false readings when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

  1. Ignition OFF, disconnect the coax cable at both components.
  2. Test for less than 5 ohms between the coax cable center terminal end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  3. Test for greater than 5 ohms between the coax cable outer shield end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. If less than infinite resistance Replace the coax cable. If infinite resistance
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Navigation Signal Splitter Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio Antenna Base Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
10 V ReferenceB2476 04
Control Terminal 6112
Control Terminal 7112
Signal Terminal 333B2476 59, B2482 00
GroundB2476 04
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative

The OnStar® button assembly consists of 3 buttons: Call/Answer, OnStar® Call Center, and OnStar® Emergency. The telematics communication interface control module supplies the OnStar® button assembly with 10 V via the 10 V reference circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the keypad signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been pressed.

  1. Ignition ON.
  2. Battery voltage must be between 9-16 V.

B2476 04

The telematics communication interface control module detects an open/high resistance on the keypad supply voltage circuit.

B2482 and B2476 59

The telematics communication interface control module detects a valid signal on the keypad signal circuit for longer than 15 seconds. If one of the OnStar® buttons is held or stuck for 15 seconds or greater, the telematics communication interface control module will set this DTC.

  1. The OnStar® status LED turns red.
  2. No calls can be placed.
  3. The telematics communication interface control module will ignore all inputs from the OnStar® button assembly.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.

  1. Ignition ON.
  2. Verify that each button of the S51 telematics button assembly operates normally by pressing each button individually. If none of the buttons operate normally Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If some, but not all, of the buttons operate normally Test or replace the A10 inside rearview mirror If all of the buttons operate normally
  3. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A10 inside rearview mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 5 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Test for 9.5-10.5 V between the 10 V reference circuit terminal 4 and ground. If less than 9.5 V Ignition OFF, disconnect the harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the 10 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 10 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 10.5 V Ignition OFF, disconnect the harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the 10 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If between 9.5-10.5 V
  5. Ignition OFF.
  6. Test for 500-900 ohms between the signal circuit terminal 3 and ground. If less than 500 ohms Disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K73 telematics communication interface control module. If greater than 900 ohms Disconnect the X1 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If between 500-900 ohms
  7. Test or replace the A10 inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Inside Rearview Mirror Replacement»(/buick/regal/v-2009-2013/remont/mirrors/#mirror-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
SignalB2485 02B2485 04

The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

  1. The ignition is in OFF, ACCESSORY or RUN position.
  2. The system voltage is between 9-16 V.
  3. The telematics communication interface control module tests the antenna once every second.

B2485 02

  1. The signal voltage is less than 1 V.
  2. The above conditions must be met for 500 ms.

B2485 04

  1. The signal voltage is greater than 2 V.
  2. The above conditions must be met for 500 ms.

Actions Taken When the DTC Sets

  1. The OnStar ® status LED turns red.
  2. Bluetooth ® functionality is disabled.
  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)
  1. Ignition ON.
  2. Verify that DTC B2458 is not set. If DTC B2485 is set Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If DTC B2485 is not set
  3. All OK.
  1. Verify that the T4S wireless communication antenna - Bluetooth ® is properly connected to the K73 telematics communication interface control module and is not damaged. If the antenna is disconnected Connect the T4S Bluetooth ® antenna to the module. If the antenna is damaged Test or replace the T4S Bluetooth ® antenna If the antenna is connected and not damaged
  2. Ignition ON.
  3. Verify DTC B2485 is not set. If the DTC is set Test or replace the T4S Bluetooth ® antenna. Clear the DTC, ignition OF. Ignition ON. Verify the DTC is not set. If the DTC is set Replace the K73 telematics communication interface control module. If the DTC is not set All OK. If the DTC is not set
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Wireless Communication Interface Antenna Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Display Dimming ControlB2625 02*B2625 04*B2625 01*
*Navigation display dimming control inoperative

The radio receives display dimming level information from the BCM via serial data. The radio supplies a pulse width modulated signal to the information display to control the display dimming level.

  1. Ignition ON.
  2. Radio ON.
  3. Exterior lighting ON.

The radio detects a short to ground, short to voltage or an open on the display dimming control circuit.

The radio sets the DTC and continues to output the desired dimming level signal.

  1. The condition responsible for setting the DTC no longer exists.
  2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, Radio ON, exterior lights ON, vary the interior lamp dimming switch from dim to bright. The navigation display brightness should vary from dim to bright.

  1. Ignition OFF, disconnect the X1 harness connector at the P17 info display module.
  2. Test for less than 10 ohms between the ground circuit terminal 2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition ON, radio ON, verify a test lamp illuminates between the remote enable signal circuit terminal 6 and ground. If the test lamp does not illuminate, test the remote enable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
  5. Lights ON, set the dimming switch to full bright. Test for 1-1.5 V on the display dimming control circuit terminal 3. If less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio. If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  6. Use the dimming switch to decrease the dimming level to full dim. Verify the voltage increases steadily to 6-7 V at full dim. If less than the specified value, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio. If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  7. If all circuits test normal, replace the P17 info display module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Driver Information Display Replacement (UDN)»(/buick/regal/v-2009-2013/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges) , «Driver Information Display Replacement (UAG)»(/buick/regal/v-2009-2013/remont/gauges-instrument-panels/#instrument-panel-system-displays-and-gauges)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Symptoms - Cellular Communication

Note. The following steps must be completed before using the symptom table.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «OnStar Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect for easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Bluetooth Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «No Global Positioning System (GPS) Reception»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «OnStar Microphone Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  4. «OnStar Audio Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  5. «OnStar Button LED Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  6. «OnStar Call Center Remote Function Requests Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  7. «OnStar Button Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  8. «Unable to Contact OnStar Call Center»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  9. «OnStar Voice Recognition Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  10. «OnStar Steering Wheel Control Functions Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-steering-wheel-control-functions-malfunction)

Symptoms - Entertainment

IMPORTANTThe following steps must be completed before using the symptom table.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to «Radio/Audio System Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__radioaudio-system-description-and-operation) .
  1. Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to «Checking Aftermarket Accessories»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
  2. Inspect for easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

  1. «Auxiliary Audio Input Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Digital Radio Poor or No Reception»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Radio Poor Reception»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  4. «Speaker Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Auxiliary Audio Input Jack

The 3.5 mm (1/8 in.) auxiliary audio input jack is located in the console. The auxiliary input jack circuits may be connected directly to the radio, or to the multimedia player interface module (if equipped). When a portable audio playback device is connected to the auxiliary jack, an internal switch opens the detection signal circuit and the radio will switch to AUX as the audio source.

When not equipped with the multimedia player interface module, all circuits from the auxiliary jack are connected directly to the radio. When a device is connected to the auxiliary jack an internal switch opens. The radio detects the device and switches to AUX as the audio source. Audio signals from the device are sent to the radio from the auxiliary input jack via the left, right, and common audio signal circuits.

When equipped with the multimedia player interface module, all circuits from the auxiliary jack are connected directly to the multimedia player interface module. When a device is connected to the auxiliary jack an internal switch opens. The multimedia player interface module detects the device and sends a serial data request to radio to switch to AUX as the audio source. Audio signals from the device are sent to the multimedia player interface module from the auxiliary input jack via the left, right, and common audio signal circuits. The multimedia player interface module then outputs these signals to the radio.

USB Port

The vehicle may be equipped with a USB port in the console. This port allows USB connectivity to the infotainment system from portable media players or a USB storage device (memory stick/ flash drive). When a device is connected to the USB port, the system detects the device and switches to USB as the audio source. Once connected, the device can be controlled from the radio controls.

The USB port is connected to the radio or multimedia player interface module (if equipped) via a standard USB cable. Mini type USB connectors are used to connect the cable at the USB port and at the radio or multimedia player interface module. Standard USB male to female connections are typically used for connecting USB cables together where an in-line connection is required. An in-line cable connection is typically found between the console and I/P harness.

Not all portable media player devices are compatible. Memory stick/ flash drive capability is limited to MP3 and WMA file types only. Video transfer from any device is not supported. Refer to the owner's manual for information on USB devices, control, and operation.

Multimedia Player Interface Module: RPO KTA or KTB (if equipped)

The multimedia player interface module is a device that is capable of receiving inputs from analog or digital audio playback devices. When equipped with RPO KTA, inputs can be received via the auxiliary input jack or USB. With RPO KTB, the multimedia player interface module has the additional capability of receiving inputs via Bluetooth®. The multimedia player interface module and the radio communicate via serial data. Messages are used for the radio to control the input source, and for the multimedia player interface module to send detection information to the radio when devices are connected. The multimedia player interface module is used to provide capability for these inputs in systems where the radio does not provide native support.

The multimedia player interface module receives the inputs from the device, and transfers the audio signals to the radio for playback. All multimedia player interface module inputs are transferred to the radio as analog audio signals via left, right, and common audio circuits.

Auxiliary Audio Input Jack

  1. When a device is first connected to the 3.5 mm (1/8 in.) input jack the infotainment system automatically switches to that device. If an auxiliary device has already been connected, press the AUX or CD/AUX button to select the device.
  2. If the system detects the device, but the audio is not heard or is not clear, attempt to connect the device using a different cable; cables can deteriorate over time or become damaged.
  3. Playback of an audio device that is connected to the 3.5 mm jack can only be controlled using the controls on the device.
  4. The volume control on the device may need to be adjusted to ensure sufficient playback volume through the infotainment system.

USB

  1. When a device is first connected to the USB port, the infotainment system automatically switches to that device. If an auxiliary device has already been connected, press the AUX or CD/AUX button to select the device.
  2. A low battery condition in a portable media player may not allow the device to connect to the system, or can create communication issues with the device. Verify the device battery state of charge and re-charge or replace as needed.
  3. Connect the device directly to the USB port if possible. Only use a cable if it is required to connect the device. The use of extension cables can cause communication issues.
  4. If a cable is required for connection, attempt to connect the device using a different cable; cables can deteriorate over time or become damaged.
  5. Attempt audio playback from multiple USB devices when diagnosing USB concerns. Device compatibility can vary based on vehicle equipment. If the infotainment system is capable of operating any USB type device, the cause of the concern is not with the vehicle system. The inoperative device(s) may be incompatible or contain no recognized media types.
  6. If a 'Device Not Supported' or similar type error message is displayed, this indicates the system has connected to the device but cannot communicate with it properly. This does not indicate an issue with the vehicle system. The device may be incompatible, may require a 'reset', or may require an update to its software/firmware.
  7. If a 'No Supported Data Found' or similar type error message is displayed, this indicates the system has connected to the device and is communicating, but cannot find any compatible files/data. This does not indicate an issue with the vehicle system. Verify the device contains compatible media/ file types.
  8. Poor connections or damaged USB cables can cause intermittent or no operation of USB devices. Inspect connectors, terminals, and cables for damage and replace components as necessary. Ensure all USB inline connections and connections at components are fully seated and connector position retainers/locks are secure.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-50334-50 EL-50334-50 USB Cable and Adapter Kit

Auxiliary Audio Input Jack

  1. Verify no DTCs are present. If any DTCs are present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Ignition ON, radio ON, connect a portable audio playback device to the auxiliary audio input jack. Verify the infotainment system switches to AUX as the audio source. If the infotainment system does not switch to AUX as the audio source, refer to Circuit/System Testing.
  3. Operate the device to begin audio playback, adjusting the volume on the device if necessary. Verify the audio from the device is heard through the vehicle infotainment system. If audio is not heard from the device, attempt to playback audio from another device. If audio cannot be heard from any device connected to the auxiliary audio input jack, refer to Circuit/System Testing.

USB Port

  1. Verify no DTCs are present. If any DTCs are present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
  2. Inspect the USB port for damage. If damage is noted, replace the USB port.
  3. Ignition ON, radio ON, connect a device to the USB port. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  4. Operate the radio controls to play audio from the device. Verify the audio from the device is heard through the vehicle infotainment system. If audio is not heard from the device, attempt to playback audio from another device. If audio cannot be heard from any device connected to the USB port, or the audio heard is not clear, refer to Circuit/System Testing.

Auxiliary Audio Input Jack without Multimedia Player Interface Module

  1. Ignition OFF, disconnect the X1 harness connector at the X83 auxiliary audio input.
  2. Ignition ON, radio ON, test for 2.5-3.5 V between the auxiliary detection terminal 1 and ground. If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  3. Ignition OFF, disconnect the X1 harness connector at the radio. Test for infinite resistance between the circuits listed below and ground: auxiliary audio common circuit terminal 23 left auxiliary audio circuit terminal 24 right auxiliary audio circuit terminal 10 If not the specified value, test the circuit for a short to ground.
  4. Test for less than 5 ohms between the A11 radio X1 terminal 24 and the X83 auxiliary audio input X1 terminal 2. If greater than the specified value, test the signal circuit for an open/high resistance.
  5. Test for less than 5 ohms between the A11 radio X1 terminal 10 and the X83 auxiliary audio input X1 terminal 4. If greater than the specified value, test the signal circuit for an open/high resistance.
  6. Test for less than 5 ohms between the A11 radio X1 terminal 23 and the X83 auxiliary audio input X1 terminal 5. If greater than the specified value, test the signal circuit for an open/high resistance.
  7. Reconnect the X1 harness connector at the A11 radio.
  8. Ignition ON, test for less than 1 V between the circuits listed below and ground: auxiliary audio common circuit X83 auxiliary audio input X1 terminal 5 left auxiliary audio circuit X83 auxiliary audio input X1 terminal 2 right auxiliary audio circuit X83 auxiliary audio input X1 terminal 4 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  9. If all circuits test normal, replace the X83 auxiliary audio input and reconnect all harness connectors. Connect and operate the portable audio playback device. If audio cannot be heard from the device, replace the A11 radio.

USB Port without Multimedia Player Interface Module

  1. Ignition OFF, disconnect the USB cable connection at the A11 radio.
  2. Connect the EL-50334-1 Type A male to Mini A male USB Cable to the A11 radio.
  3. Connect the EL-50334-3 Type A female to Type A female adapter to the EL-50334-1 Cable.
  4. Ignition ON, radio ON, connect a USB device to the EL-50334-3 adapter. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the A11 radio.
  5. Ignition OFF, reconnect the vehicle USB cable to the A11 radio.
  6. Disconnect the X301 I/P to floor console harness USB connector.
  7. Ignition ON, radio ON, connect a USB device to the I/P side of the X301 connector. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the I/P USB cable assembly.
  8. Ignition OFF, reconnect the X301 harness connector.
  9. Disconnect the USB cable at the X92 USB receptacle.
  10. Connect the EL-50334-4 Type A female to Mini B female adapter to the USB cable.
  11. Ignition ON, radio ON, connect a USB device to the EL-50334-4 adapter. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the console USB cable assembly.
  12. If all circuits test normal, replace the X92 USB receptacle.

Auxiliary Audio Input Jack with Multimedia Player Interface Module

  1. Ignition OFF, disconnect the X1 harness connector at the X83 auxiliary audio input.
  2. Ignition ON, radio ON, test for 2.5-3.5 V between the auxiliary detection terminal 1 and ground. If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the T11 multimedia player interface module. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the T11 multimedia player interface module.
  3. Ignition OFF, disconnect the X1 harness connector at the T11 multimedia player interface module. Test for infinite resistance between the circuits listed below and ground: auxiliary audio common circuit terminal 3 left auxiliary audio circuit terminal 12 right auxiliary audio circuit terminal 13 If not the specified value, test the circuit for a short to ground.
  4. Test for less than 5 ohms between the T11 multimedia player interface module X1 terminal 12 and the X83 auxiliary audio input X1 terminal 2. If greater than the specified value, test the signal circuit for an open/high resistance.
  5. Test for less than 5 ohms between the T11 multimedia player interface module X1 terminal 13 and the X83 auxiliary audio input X1 terminal 4. If greater than the specified value, test the signal circuit for an open/high resistance.
  6. Test for less than 5 ohms between the T11 multimedia player interface module X1 terminal 3 and the X83 auxiliary audio input X1 terminal 5. If greater than the specified value, test the signal circuit for an open/high resistance.
  7. Ignition OFF, disconnect the X1 harness connector at the A11 radio. Test for infinite resistance between the circuits listed below and ground: auxiliary audio common circuit terminal 23 left auxiliary audio circuit terminal 24 right auxiliary audio circuit terminal 10 If not the specified value, test the signal circuit for a short to ground.
  8. Test for less than 5 ohms between the A11 radio X1 terminal 24 and the T11 multimedia player interface module X1 terminal 14. If greater than the specified value, test the signal circuit for an open/high resistance.
  9. Test for less than 5 ohms between the A11 radio X1 terminal 10 and the T11 multimedia player interface module X1 terminal 15. If greater than the specified value, test the signal circuit for an open/high resistance.
  10. Test for less than 5 ohms between the A11 radio X1 terminal 23 and the T11 multimedia player interface module X1 terminal 4. If greater than the specified value, test the signal circuit for an open/high resistance.
  11. Reconnect the X1 harness connector at the A11 radio.
  12. Ignition ON, test for less than 1 V between the circuits listed below and ground: auxiliary audio common circuit T11 multimedia player interface module X1 terminal 4 left auxiliary audio circuit T11 multimedia player interface module X1 terminal 14 right auxiliary audio circuit T11 multimedia player interface module X1 terminal 15 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  13. If all circuits test normal, replace the X83 auxiliary audio input and reconnect all harness connectors. Connect and operate the portable audio playback device. If audio cannot be heard from the device, replace the T11 multimedia player interface module. If audio is still not heard from the device, replace the A11 radio.

USB Port with Multimedia Player Interface Module

  1. Ignition OFF, disconnect the USB cable connection at the T11 multimedia player interface module.
  2. Connect the EL-50334-2 Type A female to Mini B male USB Cable to the T11 multimedia player interface module.
  3. Ignition ON, radio ON, connect a USB device to the EL-50334-2 cable. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the T11 multimedia player interface module.
  4. Ignition OFF, reconnect the vehicle USB cable to the T11 multimedia player interface module.
  5. Disconnect the X301 I/P to floor console harness USB connector.
  6. Ignition ON, radio ON, connect a USB device to the I/P side of the X301 connector. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the I/P USB cable assembly.
  7. Ignition OFF, reconnect the X301 harness connector.
  8. Disconnect the USB cable at the X92 USB receptacle.
  9. Connect the EL-50334-4 Type A female to Mini B female adapter to the USB cable.
  10. Ignition ON, radio ON, connect a USB device to the EL-50334-4 adapter. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the console USB cable assembly.
  11. Ignition OFF, reconnect X92 USB receptacle to the vehicle USB cable.
  12. Ignition ON, radio ON, connect a USB device to the X92 USB receptacle. Verify the infotainment system switches to USB as the audio source. If the infotainment system does not switch to USB as the audio source, replace the X92 USB receptacle.
  13. Ignition OFF, disconnect the X1 harness connector at both the A11 radio and the T11 multimedia player interface module. Test for infinite resistance between the circuits listed below and ground: auxiliary audio common circuit A11 radio terminal 23 left auxiliary audio circuit A11 radio terminal 24 right auxiliary audio circuit A11 radio terminal 10 If not the specified value, test the signal circuit for a short to ground.
  14. Test for less than 5 ohms between the A11 radio X1 terminal 24 and the T11 multimedia player interface module X1 terminal 14. If greater than the specified value, test the signal circuit for an open/high resistance.
  15. Test for less than 5 ohms between the A11 radio X1 terminal 10 and the T11 multimedia player interface module X1 terminal 15. If greater than the specified value, test the signal circuit for an open/high resistance.
  16. Test for less than 5 ohms between the A11 radio X1 terminal 23 and the T11 multimedia player interface module X1 terminal 4. If greater than the specified value, test the signal circuit for an open/high resistance.
  17. Reconnect the X1 harness connector at the A11 radio.
  18. Ignition ON, test for less than 1 V between the circuits listed below and ground: auxiliary audio common circuit T11 multimedia player interface module X1 terminal 4 left auxiliary audio circuit T11 multimedia player interface module X1 terminal 14 right auxiliary audio circuit T11 multimedia player interface module X1 terminal 15 If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  19. If all circuits test normal, replace the T11 multimedia player interface module and reconnect all harness connectors. Connect and operate the USB device. If audio is still not heard from the device, replace the A11 radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Audio Disc Player and USB Receptacle Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Radio or multimedia player interface module replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Signal1
1. Red LED illuminated

The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface control module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone's information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

  1. The purpose of this diagnostic is to verify the ability of the telematics communication interface control module to pair to a Bluetooth ® device.
  2. Before performing this test, verify compatibility of the cellular phone(s) the customer is attempting to use with the vehicle. Based on the cellular phone's service provider and the manufacturer's implementation of Bluetooth ®, not all phones support all available Bluetooth ® functionality. A vehicle and feature compatibility list will be provided via the GM Bluetooth ® website: http://www.onstar.com/web/Bluetooth/
  3. If the vehicle passes the following tests and a compatible device is being used, the concern may be due to a device malfunction or an incomplete/improper pairing attempt.
  4. A Bluetooth ® test tool or equivalent can also be used to verify the ability of the customers cellular phone(s) to pair with another device.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON.
  2. Verify DTC B2485 is not set. If DTC B2485 is set Refer to «DTC B2485»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If DTC B2485 is not set
  3. Verify that the vehicle appears in the list of available devices when performing the discovery/search operation on a Bluetooth test tool or equivalent. If the vehicle does not appear in the list of available devices after repeated attempts Refer to Circuit/System Testing If the vehicle appears in the list of available devices
  4. Verify successful pairing with test tool when utilizing instructions provided in the Vehicle Owners service information. If pairing is not successful after repeated attempts Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If pairing is successful
  5. All OK.
  1. Ignition ON.
  2. Verify that the vehicle appears in the list of available devices when performing the discovery/search operation on a Bluetooth test tool or equivalent. If the vehicle does not appear in the list of available devices after repeated attempts Ignition OFF. Replace the T4S Bluetooth Antenna. Verify that the vehicle appears in the list of available devices when performing the discover/search operation on a Bluetooth test tool or equivalent. If the vehicle does not appear in the list of available devices after repeated attempts, replace the K73 telematics communication interface control module If the vehicle appears in the list of available devices All OK. If the vehicle appears in the list of available devices
  3. Verify successful pairing with test tool when utilizing instructions provided in the Vehicle Owners Manual. If pairing is not successful after repeated attempts Replace the K73 telematics communication interface control module If pairing is successful
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Wireless Communication Interface Antenna Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. The digital radio receiver is connected to the digital radio antenna via a shielded coax cable.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48028 Digital Radio Test Antenna

  1. Tune to a strong AM or FM station and verify each speaker is producing clear and even sound, with no distortion. If any speaker is not producing sound or the sound produced is distorted, refer to «Speaker Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  2. With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal message is not displayed on the radio.
  1. Ignition OFF, disconnect the digital radio antenna coax from the radio. Connect the EL-48028 digital radio test antenna to the radio and place on the roof of the vehicle. Move the vehicle outside in an area with an unobstructed view of the southern sky.
  2. Ignition ON, radio tuned to XM channel 1, verify XM reception is clear and uninterrupted. If reception is not clear, replace the radio.
  3. Ignition OFF, reconnect the antenna coax cable at the radio. Disconnect the antenna coax cable from the digital radio antenna.
  4. Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and outer shield. If less than the specified range, test the antenna coax cable for an open/high resistance. If greater than the specified range, test the antenna coax cable for a short to voltage.
  5. If all circuits test normal, replace the digital radio antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Radio Antenna Base Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Microphone SignalB2455 02B2455 04
Cellular Microphone Low ReferenceB2455 041
1. OnStar Microphone Inoperative - Caller Cannot Be Heard

The telematics communication interface control module provides the cellular phone microphone with a supplied voltage on the cellular phone microphone signal circuit. When the cellular phone microphone is in use, voice data from the user is sent back to the telematics communication interface control module on the signal circuit. The telematics communication interface control module provides a ground for the microphone via the low reference wire.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. It is necessary to have the vehicle in a quiet, open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

  1. Ignition ON.
  2. Verify that DTC B2455 is not set. If DTC B2455 is set Refer to «DTC B2455»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If DTC B2455 is not set
  3. Verify that your voice is heard clearly by the OnStar Call Center after completing a blue button press. If your voice can not be heard clearly Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If your voice can be heard clearly
  4. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B24 cellular phone microphone. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 ohms between the low reference circuit terminal A and ground. If 10 ohms or greater Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If less than 10 ohms
  3. Ignition ON.
  4. Test for 9.5-10.5 V between the signal circuit terminal B and ground. If less than 9.5 V Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 10.5 V Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If between 9.5-10.5 V
  5. Test or replace the B24 cellular phone microphone.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Mobile Telephone Microphone Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Audio Signal111
Audio Common Signal1
1. No (or Noisy) OnStar® Audio

When an OnStar® keypress is made, a serial data message is sent to the audio system to mute all radio functions and output OnStar® originated audio. After the audio system is muted, the telematics communication interface control module transmits signals to the audio system on the audio signal and audio common circuits.

Schematic Reference

  1. «OnStar Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio/Navigation System Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, radio ON.
  2. Verify that audio is heard clearly through all speaker channels when tuning radio to a known good station. If audio is not heard clearly Refer to «Speaker Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If audio is heard clearly
  3. Verify that the Connecting to OnStar® message is heard clearly through the audio system when the OnStar® blue button is pressed. If OnStar message is noisy or distorted Refer to «Circuit/System Testing»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If OnStar message is heard clearly
  4. All OK.
  1. Ignition OFF and vehicle systems OFF, disconnect the harness connector X1 at the A11 radio and disconnect the harness connector X2 at the K73 telematics communication interface control module, ignition ON.
  2. Test for less than 1 V between the K73 telematics communication interface control module signal circuit terminal 1 and ground If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
  3. Test for less than 1 V between the K73 telematics communication interface control module low reference circuit terminal 2 and ground. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
  4. Ignition OFF.
  5. Test for infinite resistance between the K73 telematics communication interface control module signal circuit terminal 1 and ground If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
  6. Test for infinite resistance between the K73 telematics communication interface control module low reference circuit terminal 2 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
  7. Test for less than 2 ohms between the K73 telematics communication interface control module signal circuit terminal 1 and the A11 radio cellular telephone voice low reference circuit terminal 20. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
  8. Test for less than 2 ohms between the K73 telematics communication interface control module low reference circuit terminal 2 and the A11 radio low reference circuit terminal 6. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
  9. Replace the K73 telematics communication interface control module.
  10. Verify that the Connecting to OnStar® message is heard clearly through the audio system when the OnStar® blue button is pressed. If audio is not heard clearly Replace the A11 radio. If audio is heard clearly
  11. All OK.

Perform the Diagnostic Repair Verification after completing the repair procedure.

Control Module References for radio or telematics communication interface control module replacement, programming and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The navigation antenna is connected to the telematics communication interface control module. The module supplies 5 V to the antenna to power the internal amplifier through the center conductor of the antenna coax cable.

When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter.

  1. The telematics communication interface control module GPS signal title on the scan tool will display a Yes or No dependent upon whether or not the module sees an increment of the seconds transmitted by GPS signals to the telematics communication interface control module. Upon entering this screen, the GPS signal title will initially display Yes, regardless of the presence of time increment, for at least 2 seconds, while the algorithm in the scan tool determines the status of the clock. If increment is found, Yes is continually displayed. If the clock remains static, No is displayed. The scan tool looks for increment every second, regardless of current display.
  2. Inaccurate or aged GPS position concerns which are no longer present may have been due to the temporary loss of GPS signal reception by the vehicle. Conditions such as tunnels or parking structures will restrict the cellular phone and navigation antenna from a clear view of the satellites in the sky and may have caused this temporary data loss.
  3. The GPS requires a clear line of sight to the sky to operate properly. In most cases the GPS will not have reception near tall buildings or inside structures.

Schematic Reference

  1. «OnStar Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio/Navigation System Schematics»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Connector End View Reference

Description and Operation

  1. «OnStar Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation)
  2. «Radio/Audio System Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__radioaudio-system-description-and-operation)

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit

Note. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition ON.
  2. Verify that no DTCs are set. If any DTCs are set Refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) If no DTCs are set
  3. Verify that an OnStar advisor can locate the vehicle after performing a blue button press. If the advisor can not locate the vehicle and the vehicle is not equipped with a navigation radio Refer to «Circuit/System Testing (without Navigation Radio)»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If the advisor can not locate the vehicle and the vehicle is equipped with a navigation radio Refer to «Circuit/System Testing (with Navigation Radio)»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If the advisor can locate the vehicle
  4. Verify that the NO GPS symbol/message is not displayed on the radio. If the NO GPS symbol/message is displayed Refer to Circuit System Testing With Navigation Radio. If the NO GPS symbol/message is not displayed
  5. All OK.

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to two minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface module. Place the test antenna on the roof of the vehicle.
  3. Ignition ON.
  4. Verify that an OnStar advisor can locate the vehicle after performing a blue button press. If the advisor can not locate the vehicle Replace the K73 telematics communication interface control module. If the advisor can locate the vehicle
  5. Ignition OFF, disconnect the K73 telematics communication interface module coax at the T4G cellular phone, navigation, and digital radio antenna.
  6. Test the coax cable between the K73 telematics communication interface control module and the T4G cellular phone, navigation, and digital radio antenna. Refer to component testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  7. Test or replace the T4G cellular phone, navigation, and digital radio antenna.

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the coax cable at the T15 navigation signal splitter. It may take up to 2 minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the navigation signal splitter. Place the test antenna on the roof of the vehicle.
  3. Ignition ON.
  4. Verify that the customer GPS concern is still present. If the GPS concern is not present Ignition OFF, disconnect the coax cable at the T4G cellular phone, navigation and digital radio antenna. Test the coax cable between the T15 navigation signal splitter and the T4G cellular phone, navigation and digital radio antenna. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test Test or replace the T4G cellular phone, navigation and digital radio antenna. If the GPS concern is still present
  5. Ignition OFF, disconnect the coax cable between the T15 navigation signal splitter and the K73 telematics communication interface control module.
  6. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the telematics communication interface module. Place the test antenna on the roof of the vehicle.
  7. Ignition ON.
  8. Verify that an OnStar advisor can locate the vehicle after performing a blue button press. If the advisor can not locate the vehicle Replace the K73 telematics communication interface control module. If the advisor can locate the vehicle
  9. Ignition OFF.
  10. Test the coax cable between the navigation signal splitter and the K73 telematics communication interface control module. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  11. Ignition OFF, disconnect the coax cable between the T15 navigation signal splitter and the A11 radio.
  12. Connect the test antenna to the radio and place the test antenna on the roof of the vehicle.
  13. Ignition ON.
  14. Verify that the NO GPS symbol/message is not displayed on the radio. If the NO GPS symbol/message is displayed Replace the A11 Radio If the NO GPS symbol/message is not displayed
  15. Ignition OFF.
  16. Test the coax cable between the T15 navigation signal splitter and the A11 radio. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  17. Test or replace the T15 navigation antenna signal splitter.
CAUTIONRefer to Test Probe Caution .

Note. Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

  1. Ignition OFF, disconnect the coax cable at both components.
  2. Test for less than 5 ohms between the coax cable center terminal end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  3. Test for greater than 5 ohms between the coax cable outer shield end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. If less than infinite resistance Replace the coax cable. If infinite resistance
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Navigation Signal Splitter Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio Antenna Base Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
10 V ReferenceB2476 04
Control Terminal 6112
Control Terminal 7112
Signal Terminal 333B2476 59, B2482 00
GroundB2476 04
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative

Circuit Description

The OnStar® status LEDs are located in the inside rearview mirror telematic button assembly. The green LED is illuminated when the system is ON and operating normally. When the green LED is green and flashing, it is an indication that a call is in progress. When the red LED is illuminated, a system malfunction is present. In the event there is a system malfunction and the OnStar® system is still able to make a call, the LED will flash red during the call. The OnStar® LEDs are controlled by the telematics communication interface control module via the keypad green LED control circuit and the keypad red LED control circuit.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. If the green LED is off with the ignition ON and the LED functions correctly when commanded with the scan tool, contact the OnStar Center to confirm the vehicle has a current subscription.

  1. Ignition ON.
  2. Verify that the green LED turns ON and OFF when commanding the K73 telematics communication interface control module green indicator ON and OFF with a scan tool. If the green LED does not turn ON and OFF Refer to Circuit/System Testing - Green LED Test If the green LED turns ON and OFF
  3. Verify that the red LED turns ON and OFF when commanding the K73 telematics communication interface control module red indicator ON and OFF with a scan tool. If the red LED does not turn ON and OFF Refer to Circuit/System Testing - Red LED Test If the red LED turns ON and OFF
  4. All OK.

Green LED Test

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the A10 inside rearview mirror. It may take up to 2 minutes for all vehicle systems to power down. Doors closed, courtesy lamps OFF.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Ignition ON.
  4. Test for less than 1 V between the control circuit terminal 6 and ground while commanding the K73 telematics communication interface control module green indicator OFF with a scan tool. If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the control circuit terminal 6 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If less than 1 V
  5. Test for greater than 8 V between the control circuit terminal 6 and ground while commanding the K73 telematics communication interface control module green indicator ON with a scan tool. If 8 V or less Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the control circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 8 V
  6. Test or replace the A10 inside rearview mirror.

Red LED Test

  1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the A10 inside rearview mirror. It may take up to 2 minutes for all vehicle systems to power down. Doors closed, courtesy lamps OFF.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
  3. Ignition ON.
  4. Test for less than 1 V between the control circuit terminal 7 and ground while commanding the K73 telematics communication interface control module red indicator OFF with a scan tool. If 1 V or greater Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the control circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If less than 1 V
  5. Test for greater than 8 V between the control circuit terminal 7 and ground while commanding the K73 telematics communication interface control module red indicator ON with a scan tool. If 8 V or less Ignition OFF, disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the control circuit terminal 7 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 8 V
  6. Test or replace the A10 inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Inside Rearview Mirror Replacement»(/buick/regal/v-2009-2013/remont/mirrors/#mirror-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The telematics communication interface control module has the capability of commanding the horn, initiating door lock/unlock, or operating the exterior lamps using the serial data circuits. These functions are commanded by the OnStar® Call Center per a customer request.

The customer concern may have been due to a lack of cellular service in a given area, or a failure in the National Cellular Network infrastructure that has since been corrected.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes. It is necessary to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

  1. Ignition ON.
  2. Verify that the horn, lights, and the door locks on the vehicle operate properly. If an applicable vehicle system does not operate properly Refer to «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) . If all applicable vehicle systems operate properly
  3. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to contact the OnStar® call center Refer to «Unable to Contact OnStar Call Center»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If able to contact the OnStar Call Center
  4. Verify with the OnStar advisor that all remote functions (door locks, lights, and horn) work. If the remote functions do not operate when requested Replace the K73 telematics communication interface control module If the remote functions operate when requested
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for telematics communication interface control module replacement, programming and setup.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
10 V ReferenceB2476 04
Control Terminal 6112
Control Terminal 7112
Signal Terminal 333B2476 59, B2482 00
GroundB2476 04
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative

The OnStar® button assembly consists of 3 buttons: Call/Answer, OnStar® Call Center, and OnStar® Emergency. The telematics communication interface control module supplies the OnStar® button assembly with 10 V via the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface control module over the keypad signal circuit. Depending upon the voltage range returned, the telematics communication interface control module is able to identify which button has been activated.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.

  1. Ignition ON.
  2. Verify that each button of the S51 telematics button assembly operates normally by pressing each button individually. If none of the buttons operate normally Refer to Circuit/System Testing. If some, but not all, of the buttons operate normally Test or replace the A10 inside rearview mirror. If all of the buttons operate normally
  3. All OK.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A10 inside rearview mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 15 ohms between the ground circuit terminal 5 and ground. If 15 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 15 ohms
  3. Ignition ON.
  4. Test for 9.5-10.5 V between the 10 V reference circuit terminal 4 and ground. If less than 9.5 V Ignition OFF, disconnect the harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the 10 V reference circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the 10 V reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If greater than 10.5 V Ignition OFF, disconnect the harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the 10 V reference circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K73 telematics communication interface control module. If between 9.5-10.5 V
  5. Ignition OFF.
  6. Test for 500-900 ohms between the signal circuit terminal 3 and ground. If less than 500 ohms Disconnect the X1 harness connector at the K73 telematics communication interface control module. Test for infinite resistance between the signal circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the K73 telematics communication interface control module. If greater than 900 ohms Disconnect the X1 harness connector at the K73 telematics communication interface control module, ignition ON. Test for less than 1 V between the signal circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF. Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K73 telematics communication interface control module. If between 500-900 ohms
  7. Test or replace the A10 inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Inside Rearview Mirror Replacement»(/buick/regal/v-2009-2013/remont/mirrors/#mirror-system)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.

OnStar Steering Wheel Control Functions Malfunction

Some vehicles equipped with the OnStar® system have the capability of accessing voice mailboxes and other automated phone systems by means of the steering wheel controls, while the OnStar® Personal Calling feature is in use. If the "Talk" or "Mute" button (depending upon the vehicle) on the steering wheel controls is depressed during an OnStar® Personal Calling call, the telematics communication interface control module receives the message on the serial data bus from either the radio or body control module. This message is interpreted as a request to turn any spoken numbers into dual tone multi-frequency tones to be delivered over the airwaves to the phone system the user is communicating with. Complete instructions for operation of these features can be found in the information provided to the customer with the OnStar® system.

The steering wheel controls are a resistor network that consist of multiple momentary contact switches and a series of resistors. The switches and resistor network are arranged so that each switch has a different resistance value. When a switch is pressed, a voltage drop occurs in the resistor network, which produces a specific voltage value unique to the switch selected, to be interpreted by either the radio or BCM. In the event the OnStar® steering wheel control functions are inoperative, technicians should refer to Steering Wheel Controls Malfunction , to begin diagnosis of the steering wheel control concern.

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Radio Antenna CoaxB125A 02B125A 041
Ground1
1. May exhibit possible AM/FM interference

AM and FM radio reception is dependent on the following components

  1. Radio antenna in the rear glass
  2. Radio antenna module
  3. Coax cable between the radio antenna and the radio antenna module
  4. Radio

The antenna amplifier receives both AM and FM signals from the rear glass antenna. The radio antenna amplifier is enabled when the radio is turned on. The radio provides battery voltage to the antenna amplifier using the center conductor of the antenna coaxial cable. When a 12 V signal is seen by the module on the center conductor of the antenna coax, both AM and FM signals are amplified.

Poor AM and FM radio reception is dependent on multiple influences, some of which may not be vehicle related. Areas which have high RF traffic or block the signal path may cause a degradation in radio reception. Radio reception may also be influenced by items within the vehicle, but not part of the radio system. Such examples are aftermarket electrical accessories or other items which may generated noise in the vehicle electrical system. Aftermarket window tinting, especially when there is a metallic in the film, may reduce radio reception.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the radio antenna coax from the A11 radio and from the radio antenna amplifier.
  2. Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax.
  3. Test for less than 5 ohms on the antenna coax center circuit from end to end. If greater than the specified range, replace the antenna coax.
  4. Ignition ON, test for less than 1 V between the antenna coax center terminal and ground. If greater than the specified range, replace the antenna coax.
  5. Test for infinite resistance between the coax center terminal and the outer shield. If less than the specified value, replace the antenna coax.
  6. Connect the antenna coax to the A11 radio. Test for 12-15 V between the antenna coax center terminal and ground at the radio antenna amplifier connector. If not within the specified range, replace the A11 radio.
  7. If all circuits test normal, replace the radio antenna amplifier.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

Speaker Replacement Reference

Speaker Replacement Reference

  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is approximately one half of battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

  1. Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.
  2. When equipped with an amplifier, it is possible for some individual circuit faults to affect more than one speakers operation. Perform diagnostic tests in the sequence listed to avoid misdiagnosis.
  3. The amplifier control circuit will measure less than 1 V when the mute function is OFF, and approximately 8 V DC when at full mute. When mute is active, the radio stops sending the varying AC voltage to the amplifier/speakers.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-50334-50 EL-50334-50 USB Cable and Adapter Kit

Without Amplifier (U65)

Radio ON, Mute OFF, verify clear audio is heard from each audio speaker.

  1. If audio is inoperative from all speakers, replace the radio.
  2. If audio is inoperative from one or more, but not all, speakers or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction - without Amplifier.

With Amplifier (UQA)

Radio ON, Mute OFF, verify clear audio is heard from each audio speaker.

  1. If audio is not heard from all speakers, or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction - with Amplifier.

Speaker Circuit Malfunction - without Amplifier

  1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
  2. Radio ON, mute OFF, test for 5.0-7.5 volts between each audio signal circuit terminal 1 and terminal 2 and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Insert the EL-50334-6 Audio Test CD from the «EL-50334-50»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) EL-50334-50 USB Cable and Adapter Kit.
  4. Play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between each signal circuit terminal 1 and terminal 2 and ground. If not the specified value, replace the A11 radio.
  5. If all circuits test normal, replace the speaker.

Speaker Circuit Malfunction - with Amplifier

  1. Ignition OFF, disconnect the X1 harness connector at the T3 audio amplifier.
  2. Test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Disconnect the X3 harness connector at the T3 audio amplifier.
  5. Ignition ON, radio ON, verify a test lamp illuminates between the remote enable signal circuit terminal 13 and ground. If the test lamp does not illuminate, test the remote enable signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio.
  6. Radio ON, mute OFF, test for less than 1 V between the amplifier control circuit terminal 6 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  7. Test for 4-8 V between the audio signal circuit terminals listed below and ground. Left front low level audio signal (+) terminal 9 Left front low level audio signal (-) terminal 1 Right front low level audio signal (+) terminal 10 Right front low level audio signal (-) terminal 2 Left rear low level audio signal (+) terminal 11 Left rear low level audio signal (-) terminal 3 Right rear low level audio signal (+) terminal 12 Right rear low level audio signal (-) terminal 4 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 radio. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 radio.
  8. Insert the EL-50334-6 Audio Test CD from the «EL-50334-50»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) EL-50334-50 USB Cable and Adapter Kit.
  9. Mute OFF, play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground. Left front low level audio signal (+) terminal 9 Left front low level audio signal (-) terminal 1 Right front low level audio signal (+) terminal 10 Right front low level audio signal (-) terminal 2 Left rear low level audio signal (+) terminal 11 Left rear low level audio signal (-) terminal 3 Right rear low level audio signal (+) terminal 12 Right rear low level audio signal (-) terminal 4 If not the specified value, replace the A11 radio.
  10. Ignition OFF, reconnect all harness connectors at the T3 audio amplifier.
  11. Disconnect the harness connector at the appropriate T19 speaker.
  12. Ignition ON, radio ON, test for 4-8 V between the appropriate speaker signal terminals listed below and ground: Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (-) circuit terminal 1 Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (+) circuit terminal 2 Subwoofer speaker control (-) circuit terminal A Subwoofer speaker control (+) circuit terminal B If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the T3 audio amplifier. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the T3 audio amplifier.
  13. Mute OFF, play track number three (50 Hz bass test tone) from the test CD. Test for 49-51 Hz AC between the audio signal circuit terminals listed below and ground. Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (-) circuit terminal 1 Door speakers, front tweeter speakers, rear compartment speakers, or center I/P speaker: speaker control (+) circuit terminal 2 Subwoofer speaker control (-) circuit terminal A Subwoofer speaker control (+) circuit terminal B If not the specified value, replace the T3 audio amplifier.
  14. If all circuits test normal, replace the appropriate T19 speaker.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Speaker Replacement Reference»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
  2. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for amplifier or radio replacement
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The telematics communication interface control module is a cellular device that allows the user to communicate data and voice signals over the national cellular network. When an OnStar keypress is made, the telematics communication interface control module activates and connects the system to the cellular carriers communication system by interacting with the national cellular infrastructure. The module sends and receives all cellular communications over the cellular phone and navigation antenna and cellular antenna coax.

  1. The customer concern may have been due to a lack of cellular service in a given area. A failure in the National Cellular Network infrastructure at the time of the customers failed connection that has since been repaired may also have been the cause.
  2. If an OnStar® emergency call is able to successfully connect the vehicle to the OnStar® Call Center when an OnStar® Call Center button press is not, there may be a failure in the ability of the OnStar® system in the vehicle to be recognized by the local cellular carrier.
  3. If the prompt "OnStar® request ended" is heard, without pressing the white dot button at the end of the OnStar® keypress, the OnStar® system at one time has made a successful cellular connection, but was unable to complete the call.
  4. It is important to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit

Note. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition ON.
  2. Verify that DTC B2470 is not set. If DTC B2470 is set Refer to «DTC B2470»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If DTC B2470 is not set
  3. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to connect with the OnStar Call Center. Refer to bulletin PIC4310. If able to connect with the OnStar Call Center
  4. All OK.

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface control module.
  3. Ignition ON, wait 5 minutes.
  4. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to connect with the OnStar Call Center Test or replace the K73 telematics communication interface control module. If able to connect with the OnStar Call Center
  5. Ignition OFF, disconnect the EL-49903 GM OnStar antenna diagnostic tool kit from the K73 telematics communication interface control module
  6. Test the coax cable between the K73 telematics communication interface control module and the T4G cellular phone, navigation, and digital radio antenna. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  7. Test or replace the T4G cellular phone, navigation, and digital radio antenna.

Note. The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. The following verification requires the vehicle to be outside with an unobstructed view of the southern sky. Allow 5 minutes after turning the ignition ON for the GPS satellites to acquire vehicle signal.

  1. Ignition OFF and all vehicle systems OFF, disconnect the GPS and cellular coax cable connector at the K73 telematics communication interface control module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Using the EL-49903-3 kit (EL-49903-5 adapter and EL-49903-4 coax cable), connect the EL-49903 GM OnStar antenna diagnostic tool kit to the K73 telematics communication interface control module.
  3. Ignition ON, wait 5 minutes.
  4. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to connect with the OnStar Call Center Test or replace the K73 telematics communication interface control module. If able to connect with the OnStar Call Center
  5. Ignition OFF, disconnect the EL-49903 from the K73 telematics communication interface control module.
  6. Test the coax cable between the K73 telematics communication interface control module and the T15 cellular phone, navigation antenna signal splitter. Refer to Component Testing. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  7. Test the coax cable between the navigation antenna signal splitter and the T4G cellular phone, navigation, and digital radio antenna. If the coax cable does not pass the test Replace the coax cable. If the coax cable passes the test
  8. Test or replace the T15 navigation and signal splitter.
  9. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button. If unable to connect with the OnStar Call Center Test or replace the T4G cellular phone, navigation, and digital radio antenna. If able to connect with the OnStar Call Center
  10. All OK.
CAUTIONRefer to Test Probe Caution .

Note. Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues. To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

  1. Ignition OFF, disconnect the coax cable at both components.
  2. Test for less than 5 ohms between the coax cable center terminal end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  3. Test for greater than 5 ohms between the coax cable outer shield end to end. If 5 ohms or greater Replace the coax cable. If less than 5 ohms
  4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield. If less than infinite resistance Replace the coax cable. If infinite resistance
  5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Navigation Signal Splitter Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio Antenna Base Replacement»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Control Module References»(/buick/regal/v-2009-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, programming and setup.
  1. Perform the «Diagnostic System Check - Vehicle»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/buick/regal/v-2009-2013/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The telematics communication interface control module is capable of interpreting voice commands received over the cellular microphone circuit. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over the cellular communication network. The module attempts to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
  2. «Connector Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
  4. «Wiring Repairs»(/buick/regal/v-2009-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Note. It is necessary to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites. The vehicle should be located in a quiet area.

  1. Ignition ON, press the blue OnStar Call button.
  2. Verify that your voice is heard clearly by the OnStar Call center. If your voice can not be heard clearly Refer to «OnStar Microphone Malfunction»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) If your voice can be heard clearly
  3. Verify that the system responds appropriately to all voice commands by pressing the blue OnStar Call button and attempting to operate the system using multiple voice commands. If the OnStar system does not respond to any voice commands Test or replace the K73 telematics communication interface control module If the OnStar system responds to some, but not all voice commands Refer to «OnStar Description and Operation»(/buick/regal/v-2009-2013/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation) for tips on proper pronunciation If the OnStar system responds to all voice commands
  4. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for telematics communication interface control module replacement, programming and setup.

Scheme 9

Scheme 9: Mobile Telephone Microphone Replacement
Scheme 9: Mobile Telephone Microphone Replacement
CalloutComponent Name
1Sunroof Actuator Trim Cover Procedure Remove the sunroof actuator trim cover. TIP: Use a flat bladed tool to release the trim cover.
2Mobile Telephone Microphone Procedure Disconnect the electrical connector. Release the microphone out of the retainer. Make a functional check.

Mobile Telephone Microphone Replacement

Scheme 10

Scheme 10: Communication Interface Module Replacement
Scheme 10: Communication Interface Module Replacement
CalloutComponent Name
Preliminary Procedure Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection . Remove the instrument panel lower trim panel replacement. Refer to Instrument Panel Lower Trim Panel Replacement - Left Side . Remove the instrument panel lower extension side trim panel. Refer to Instrument Panel Lower Extension Side Trim Panel Replacement . Remove the instrument panel lower center trim panel. Refer to Instrument Panel Lower Center Trim Panel Replacement .
1Instrument Panel Wiring Harness Protector
2Wireless Communication Interface Antenna
3Communication Interface Module Procedure Disconnect the electrical connections. For programming and set up information. Refer to Control Module References .

Communication Interface Module Replacement

Scheme 11

Scheme 11: Communication Interface Module Battery Replacement
Scheme 11: Communication Interface Module Battery Replacement
CalloutComponent Name
Preliminary Procedure Remove the communication interface module bracket. Refer to Communication Interface Module Bracket Replacement .
1Communication Interface Module Battery Procedure Unsnap the communication interface module battery from the bracket. Disconnect the electrical connectors.

Communication Interface Module Battery Replacement

Scheme 12

Scheme 12: Wireless Communication Interface Antenna Replacement
Scheme 12: Wireless Communication Interface Antenna Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel ashtray housing. Refer to Instrument Panel Ashtray Housing Replacement .
1Wireless Communication Interface Antenna Assembly Procedure Unsnap the antenna from the communication interface module.

Wireless Communication Interface Antenna Replacement

Scheme 13

Scheme 13: Communication Interface Module Bracket Replacement
Scheme 13: Communication Interface Module Bracket Replacement
CalloutComponent Name
Preliminary Procedure Remove the communication interface module. Refer to Communication Interface Module Replacement
1Communication Interface Module Bracket

Communication Interface Module Bracket Replacement

Scheme 14

Scheme 14: Radio Replacement
Scheme 14: Radio Replacement
CalloutComponent Name
Preliminary Procedures Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection . Remove the instrument panel lower center trim panel. Refer to Instrument Panel Lower Center Trim Panel Replacement .
1Radio Fastener (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
2Radio Procedure Disconnect the electrical connections. After repairs, refer to Control Module References for programming and set up information.
CAUTION
Refer to Fastener Caution .

Radio Replacement

Scheme 15

Scheme 15: Audio Disc Player and USB Receptacle Replacement
Scheme 15: Audio Disc Player and USB Receptacle Replacement
CalloutComponent Name
Preliminary Procedure Remove the front floor console compartment. Refer to Front Floor Console Compartment Replacement .
1Audio Disc Player and USB Receptacle Procedure Depress the tabs and remove the receptacle from the rear compartment. TIP: The rear compartment does not need to be removed from the front floor console cup holder housing to remove the receptacle.

Audio Disc Player and USB Receptacle Replacement

Scheme 16

Scheme 16: Radio Speaker Amplifier Replacement
Scheme 16: Radio Speaker Amplifier Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear compartment side trim panel. Refer to Rear Compartment Side Trim Panel Replacement (without HP6) , Rear Compartment Side Trim Panel Replacement (HP6, Left Side) , Rear Compartment Side Trim Panel Replacement (HP6, Right Side) .
1Radio Speaker Amplifier Nut (Qty: 3) CAUTION: Refer to Fastener Caution .
2Radio Speaker Amplifier Bolt (Qty: 3)
3Radio Speaker Amplifier Assembly Procedure Disconnect the electrical connectors. For programming and set up information, refer to Control Module References .
CAUTION
Refer to Fastener Caution .

Radio Speaker Amplifier Replacement

Scheme 17

Scheme 17: Multimedia Player Interface Module Replacement
Scheme 17: Multimedia Player Interface Module Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement .
1Multi Media Player Interface Module Assembly Procedure Disconnect the electrical connectors. Unsnap to release the module from the bracket.

Multimedia Player Interface Module Replacement

Scheme 18

Scheme 18: Navigation Signal Splitter Replacement
Scheme 18: Navigation Signal Splitter Replacement
CalloutComponent Name
Preliminary Procedure Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement .
1Navigation Signal Splitter Assembly Procedure Disconnect the electrical connectors. Unsnap the navigation signal splitter from the bracket.

Navigation Signal Splitter Replacement

Scheme 19

Scheme 19: Radio Antenna Base Replacement
Scheme 19: Radio Antenna Base Replacement
CalloutComponent Name
Preliminary Procedure Remove the headlining trim panel. Refer to Headlining Trim Panel Replacement (With Sunroof) , Headlining Trim Panel Replacement (Without Sunroof) .
1Radio Antenna Base Retainer
2Radio Antenna Base Fastener
3Radio Antenna Base Procedure Disconnect the electrical connector. Use a new retainer.

Radio Antenna Base Replacement

Scheme 20

Scheme 20: Radio Antenna Amplifier Replacement
Scheme 20: Radio Antenna Amplifier Replacement
CalloutComponent Name
Preliminary Procedure Remove the right body lock pillar upper trim panel. Refer to Body Lock Pillar Upper Trim Panel Replacement (Sedan) .
1Radio Antenna Amplifier Fastener CAUTION: Refer to Fastener Caution . Tighten 8 N.m (71 lb in)
2Radio Antenna Amplifier Procedure Disconnect the electrical connector.
CAUTION
Refer to Fastener Caution .

Radio Antenna Amplifier Replacement

Scheme 21

Scheme 21: Radio Control Module Replacement
Scheme 21: Radio Control Module Replacement
CalloutComponent Name
Preliminary Procedures Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection . Remove the instrument panel lower center trim panel. Refer to Instrument Panel Lower Center Trim Panel Replacement .
1Radio Control Module Fastener (Qty: 5) CAUTION: Refer to Fastener Caution .
2Radio Control Module Procedure Disconnect the radio control module electrical connector. Disconnect antenna cable. Use a flat bladed plastic trim tool to aid in the removal of the radio control module.
CAUTION
Refer to Fastener Caution .

Radio Control Module Replacement

Scheme 22

Scheme 22: Radio and Telephone Control Switch Replacement
Scheme 22: Radio and Telephone Control Switch Replacement
CalloutComponent Name
Preliminary Procedure Remove the steering wheel lower cover. Refer to Steering Wheel Spoke Lower Cover Replacement .
1Steering Wheel Lower Cover Fasteners (Qty: 2) CAUTION: Refer to Fastener Caution .
2Radio and Telephone Control Switch Procedure Release all the retainers and disconnect the electrical connector. Remove the radio and telephone control switch.
CAUTION
Refer to Fastener Caution .

Radio and Telephone Control Switch Replacement

Scheme 23

Scheme 23: Audio Multifunction Control Replacement
Scheme 23: Audio Multifunction Control Replacement
CalloutComponent Name
1Front Floor Console Front Compartment TIP: Use a flat-bladed plastic trim tool in order to release the retainer clips securing the front floor console front compartment to the front floor upper console trim plate.
2Audio Multifunction Control Procedure Disconnect the electrical connections.

Audio Multifunction Control Replacement

Scheme 24

Scheme 24: Radio Rear Speaker Grille Replacement
Scheme 24: Radio Rear Speaker Grille Replacement
CalloutComponent Name
1Radio Rear Speaker Grille Procedure Use a small flat-bladed tool to release the radio rear speaker grille.

Radio Rear Speaker Grille Replacement

Scheme 25

Scheme 25: Radio Front Speaker Replacement
Scheme 25: Radio Front Speaker Replacement
CalloutComponent Name
Preliminary Procedure Remove the windshield defroster nozzle grille. Refer to Windshield Defroster Nozzle Grille Replacement .
1Radio Front Speaker Fastener (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 2.5 N.m (22 lb in)
2Radio Front Speaker Procedure Disconnect the electrical connector.
CAUTION
Refer to Fastener Caution .

Radio Front Speaker Replacement

Scheme 26

Scheme 26: Radio Front Side Door Upper Speaker Replacement
Scheme 26: Radio Front Side Door Upper Speaker Replacement
CalloutComponent Name
Preliminary Procedure Remove front side door outside rearview mirror filler. Refer to Front Side Door Outside Rearview Mirror Filler Replacement .
1Radio Front Side Door Upper Speaker Procedure Use a small flat-bladed tool to release the radio front side door upper speaker.

Radio Front Side Door Upper Speaker Replacement

Scheme 27

Scheme 27: Radio Front Side Door Speaker Replacement
Scheme 27: Radio Front Side Door Speaker Replacement
CalloutComponent Name
Preliminary Procedure Remove the front side door trim panel. Refer to Front Side Door Trim Panel Replacement .
1Radio Front Side Door Speaker Fastener CAUTION: Refer to Fastener Caution .
2Radio Front Side Door Speaker Procedure Disconnect the electrical connection. Release the radio front side door speaker retainer.
CAUTION
Refer to Fastener Caution .

Radio Front Side Door Speaker Replacement

Scheme 28

Scheme 28: Radio Rear Side Door Speaker Replacement
Scheme 28: Radio Rear Side Door Speaker Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear side door water deflector. Refer to Rear Side Door Water Deflector Replacement .
1Radio Rear Side Door Speaker Fastener CAUTION: Refer to Fastener Caution .
2Radio Rear Side Door Speaker Procedures Disconnect the radio rear side door speaker electrical connector. Release radio rear side door speaker retainer.
CAUTION
Refer to Fastener Caution .

Radio Rear Side Door Speaker Replacement

Scheme 29

Scheme 29: Radio Rear Compartment Speaker Replacement
Scheme 29: Radio Rear Compartment Speaker Replacement
CalloutComponent Name
Preliminary Procedure Remove the rear window panel trim. Refer to Rear Window Panel Trim Replacement (with HP6) , Rear Window Panel Trim Replacement (without HP6) .
1Radio Rear Compartment Speaker Fastener CAUTION: Refer to Fastener Caution .
2Radio Rear Compartment Speaker Procedure Disconnect the radio rear compartment speaker electrical connector.
CAUTION
Refer to Fastener Caution .

Radio Rear Compartment Speaker Replacement

Navigation System Description and Operation

Each item in the list below represents topics covered in detail below.

  1. Audio System Description
  2. Navigation System Components
  3. Navigation Radio
  4. Global Positioning System (GPS) Antenna
  5. Route Guidance
  6. Voice Recognition
  7. Points of Interest
  8. Traffic Information
  9. Weather Information

Audio System Description

The Navigation radio operates similar to a traditional radio. For information on the audio description and operation, see Radio/Audio System Description and Operation .

Navigation System Components

The navigation system contains the following components

  1. Navigation radio
  2. Info display module
  3. Radio/HVAC controls
  4. Global positioning system (GPS) antenna

Navigation Radio

The navigation radio is located in the center of the instrument panel. The navigation radio provides the following

  1. A hard disk drive that stores map data for navigation and map route guidance.
  2. Digital video signals to the info display module screen.
  3. Traffic and weather information for display on the navigation system map (with active subscription, where available).
  4. Provides verbal guidance to the operator.
  5. Connection to the global positioning system (GPS) antenna, which provides the vehicle position information.

Scheme 30

Scheme 30: Navigation Radio Communications Diagram
Scheme 30: Navigation Radio Communications Diagram
CalloutComponent Name
1Radio Controls
2Info Display Module
3Radio
4HVAC Control Module
5Data Link Connector
6HVAC Controls
AGMLAN
BLocal Interconnect Network
CCAN Graphical Interface
DDigital Video

Info Display Module

The info display module has continuous power and ground. When the navigation radio is on, a discrete 12 V signal is supplied on the remote enable circuit to the color display module. This signal is used to control the power state of the module, which is active when the signal is high and inactive when the signal is low.

The info display module receives digital video data from the radio for on-screen display information through the video signal circuits. Backlighting dimming level is controlled by the radio through a pulse width modulated circuit. The output is determined by dimming level information the radio receives via serial data.

Radio/HVAC Controls

When equipped with the navigation radio, the radio controls communicate radio control inputs directly to the navigation radio with the CAN Graphical Interface (CGI) data circuits. After receiving the message the radio will perform the requested function. Messages communicated between the radio and the radio controls include the following

  1. Button presses/knob rotations
  2. Commands for the state of indicators
  3. Radio control back-lighting

The HVAC controls are a separate component from the radio controls. HVAC data for controls and status indicators is communicated between the HVAC controls and the HVAC control module with a separate LIN serial data circuit. HVAC status screen information from the HVAC control module is transmitted to the radio on the GMLAN serial data circuit. The radio then displays the desired screen information on the info display using the video data circuits.

Global Positioning System (GPS) Antenna

The global positioning system (GPS) antenna is part of the multi-band antenna located on the roof of the vehicle. The GPS antenna is used to collect the signals of the orbiting GPS satellites. Within the antenna is housed a low noise amplifier that allows for a more broad and precise reception of this data. The GPS antenna amplifier is powered through the coaxial cable.

The antenna is connected to the navigation radio through a signal splitter. The signal splitter is a component for dividing the navigation signal into two paths without any transmission loss. This allows the use of a single GPS antenna to provide a signal to both the navigation radio and the telematics communication interface module.

Route Guidance

The map will display the route to the selected destination. Voice prompts alert the operator of upcoming events (turns) and arrivals at the destination. The navigation system will automatically recalculate if the route is not followed. The navigation radio uses data received from the global positioning system (GPS) satellites, the vehicle speed signal. and serial data information to accurately display the current position of the vehicle.

Voice Recognition

The Navigation System's voice recognition allows for hands-free operation of navigation and audio system features. The voice recognition can be used when the ignition is in accessory or ON, or when retained accessory power is active. For a complete list of available commands, refer to the Owners Service Information Navigation Supplement and/or Personalization in the Owners service information.

Points of Interest

Points of interests are locations that are frequently visited. Points of interest can be can be displayed on the map or set as a destination. The following are some of the available Points of interests

  1. Gas Station
  2. Restaurant
  3. College
  4. Police Station

Traffic Information

XM NavTraffic™ is a subscription based service that enhances the navigation system with live traffic information. The service provides information on traffic conditions such as traffic speed, accidents, disabled vehicles, construction and road closings.

The integrated XM satellite radio receives the information. When Traffic Information is turned ON in the configuration menu, the available information will be displayed on the map screen.

The traffic information can vary based upon coverage in the area, and coverage is not available in all areas. No information will be displayed if coverage is not available, if there is no traffic information for the area, or if there is no subscription to receive the information.

A subscription fee is required in order to receive the XM NavTraffic™ service. No traffic data will be displayed without a current subscription.

Weather Information

XM NavWeather™ is a subscription based service that transmits weather information to the integrated XM satellite radio. Real time information such as current and future weather and road conditions, atmospheric conditions, and National Weather Service warnings is provided, as well as 3 day forecasts for some cities. Received information is available to be displayed on the Weather Info screen.

A subscription fee is required in order to receive the XM NavWeather™ service. No weather data will be displayed without a current subscription.

OnStar Description and Operation

This OnStar® system consists of the following components

  1. Telematics Communication Interface Module
  2. OnStar® button assembly
  3. Microphone
  4. Cellular antenna
  5. Navigation antenna
  6. Bluetooth ® antenna (If Equipped)
  7. Back Up Battery (If Equipped)

This system also interfaces with the factory installed vehicle audio system.

Telematics Communication Interface Module

The telematics communication interface module is a cellular device that allows the user to communicate data and voice signals over the national cellular network. Power is provided by a dedicated, fused B+ circuit. Ground is provided through the vehicle wiring harness attached to the module. The ignition state is determined by the telematics communication interface module through serial data messaging.

Dedicated circuits are used to connect the telematics communication interface module to a microphone, the button assembly, and to command the status LED. The telematics communication interface module communicates with the rest of the vehicle over the serial data bus.

The module houses 2 technology systems, one to process GPS data, and another for cellular information. The cellular system connects the OnStar® system to the cellular carrier's communication system by interacting with the national cellular infrastructure. The module sends and receives all cellular communications over the cellular antenna and cellular antenna coax. GPS satellites orbiting earth are constantly transmitting signals of their current location. The OnStar® system uses the GPS signals to provide location on demand.

The module also has the capability of activating the horn, initiating door lock/unlock, slowing down stolen vehicle gradually, or activating the exterior lamps using the serial data circuits. These functions can be commanded by the OnStar® Call Center per a customer request.

OnStar® Button Assembly

The OnStar® button assembly may be part of the rearview mirror, or a separate, stand alone unit. The button assembly is comprised of 3 buttons and a status LED. The buttons are defined as follows

  1. The answer/end call button, which is black with a white phone icon, allows the user to answer and end calls or initiate speech recognition.
  2. The blue OnStar® call center button, which displays the OnStar® logo, allows the user to connect to the OnStar® call center.
  3. The emergency button, which displays a white cross with a red background, sends a high priority emergency call to the OnStar® call center when pressed.

The telematics communication interface module supplies 10 volts to the OnStar® button assembly on the keypad supply voltage circuit. When pressed, each button completes a circuit across a resistor allowing a specific voltage to be returned to the telematics communication interface module on the keypad signal circuit. Depending upon the voltage range returned the telematics communication interface module is able to identify which button has been pressed.

The OnStar® status LED is located with the button assembly. The LED is green when the system is ON and operating normally. When the status LED is green and flashing, it is an indication that a call is in progress. When the LED is red, this indicates a system malfunction is present. In the event there is a system malfunction and the OnStar® system is still able to make a call, the LED will flash red during the call.

If the LED does not illuminate, this may indicate that the customers OnStar® subscription is not active or has expired. Push the blue OnStar button to connect to an advisor who can then verify the account status.

Each LED is controlled by the telematics communication interface module over dedicated LED signal circuits. Ground for the LED is provided by the wiring harness attached to the button assembly.

Secondary OnStar® Controls

Some vehicles may have an additional button that when pushed can engage the OnStar® system. The button may be a symbol of a face with sound waves, or may say MUTE, or be a symbol of a radio speaker with a slash through it.

By engaging the OnStar® system with this feature, the user can interact with the system by use of voice commands. A complete list of these commands is supplied in the information provided to the customer. If the information is not available for reference, at any command prompt the user can say "HELP" and the telematics communication interface module will return an audible list of available commands.

OnStar® Microphone

The OnStar®, or cellular phone microphone, can be a part of the rearview mirror assembly, or on some vehicle lines, a separate, stand alone unit. In either case, the telematics communication interface module supplies approximately 10 V to the microphone on the cellular phone microphone signal circuit, and voice data from the user is sent back to the telematics communication interface module over the same circuit. A cellular phone microphone low reference circuit or a drain wire provides a ground for the microphone.

Cellular and GPS Antennas

This vehicle will be equipped with one of the following types of antennas

  1. Separate, standalone cellular and navigation antennas
  2. A combination cellular and navigation antenna, which brings the functions of both into a single part
  3. A cellular, GPS, and digital radio receiver antenna, which also incorporates the functionality of the digital radio receiver satellite antenna (XM).
  4. A cellular, GPS, and digital radio receiver antenna, which also incorporates the AM/FM antenna.

The cellular antenna is the component that allows the OnStar® system to send and receive data over airwaves by means of cellular technology. The antenna is connected at the base to a coax cable that plugs directly into the telematics communication interface module.

The GPS antenna is used to collect the signals of the orbiting GPS satellites. Within the antenna is housed a low noise amplifier that allows for a more broad and precise reception of this data. The antenna is connected at the base to a coax cable that plugs directly into the telematics communication interface module. The cable also provides a path for DC current for powering the antenna.

The OnStar® Call Center also has the capability of communicating with the vehicle during an OnStar® call to retrieve the latest GPS location and transmit it to the OnStar® Call Center. A history location of the last recorded position of the vehicle is stored in the module and marked as aged, for as long as the module power is not removed. Actual GPS location may take up to 10 minutes to register in the event of a loss of power.

Navigation Signal Antenna Splitter

The navigation signal splitter is a component for dividing the navigation signal antenna signal into two paths without any transmission loss. It has two RF-connectors, one signal fakra connector and one double fakra connector. Port 1 is the input for connecting to the navigation signal antenna, port 2 is the output for the car OnStar navigation system, port 3 is the output for the navigation radio. Port 1 and 2 are galvanically coupled internally using a matching network. The OnStar system supplies the navigation signal antenna with power via port 2. Connectivity is made between port 1 and 3 though and internal coupling element and low noise amplifier. The navigation radio provides the amplifier with power via port 3.

OnStar® RemoteLink (If Equipped)

OnStar® RemoteLink is a mobile app to link mobile devices to a vehicle for limited diagnostics and feature controls. After downloading the app and registering the device, vehicle owners with an eligible vehicle can use their mobile devices to access real-time data from their vehicle and perform specific commands remotely.

All communication between the app and the vehicle is powered by OnStar's® advanced connected vehicle technology. An active OnStar® account as well as a valid OnStar® username and password are required to use the app. The remote commands must be enabled by logging into the user's OnStar® account prior to using the app.

Vehicle Control Features

  1. Lock/Unlock doors
  2. Start vehicle remotely
  3. Activate your Horn & Lights
  4. Contact an OnStar Advisor, Roadside Assistance or your Preferred Dealer

Available Vehicle Data

  1. Real-time fuel information, including fuel range, fuel remaining, and lifetime MPG
  2. Lifetime mileage
  3. Remaining oil life
  4. Current tire pressure information
  5. OnStar® account information

Compass Heading

The telematics communication interface module has a compass feature to calculate vehicle direction which is displayed via the instrument panel cluster or designated display. The compass heading is determined by dead reckoning until the GPS 3d fix is established. The dead reckoning is accomplished by using the yaw rate sensors and wheel ticks to determine heading changes from a GPS known heading. The GPS 3d fix heading is determined by the deferential of two locations.

Bluetooth ® (If Equipped)

Bluetooth ® wireless technology is a short-range communications technology intended to replace the cables connecting portable and/or fixed devices while maintaining high levels of security. Only vehicles with steering wheel controls will have Bluetooth ® functionality. In order to utilize the vehicle Bluetooth ® system, a Bluetooth ® equipped cellular phone is required.

The Bluetooth ® antenna is a small fixed antenna connected directly to the telematics communication interface module and is used to send and receive signals from a Bluetooth ® enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle. The available features and functions are determined by the software within the device being used and the telematics communication interface module. The operating range of the signal from the vehicle is approximately 30 feet. Note that the operating range is dependent upon the cellular phone being used and battery level of the phone.

With Bluetooth ® technology customers can experience hands-free calling as their Bluetooth ® capable cellular phones are wirelessly connected to the vehicle. It will allow customers to place and receive calls using the steering wheel controls and voice recognition. The vehicle audio system will allow you to listen to your call through the vehicle speakers and adjust volume through steering wheel or radio controls.

Not all Bluetooth ® cellular phones are guaranteed to work with the vehicle's Bluetooth ® system. Based on the cellular phone's service provider and the manufacturer's implementation of Bluetooth ®, not all phones support all available Bluetooth ® functionality. Bluetooth ® enabled cellular phones will be tested for vehicle compatibility and a feature compatibility list will be provided via the GM Bluetooth ® website: http://www.gm.com/vc/bluetooth/

Bluetooth ® Features Supported

The following is a list of features supported by the Bluetooth ® system. Note that not all devices will support all of the listed functions.

  1. Automatic reconnection - highest priority phone will automatically be connected to vehicle when vehicle ignition is on
  2. Hands-free dialing- via digits, redial, name tags (phone number saved to a nametag via voice recognition)
  3. Answering a call
  4. Ending a call
  5. Mute a Call
  6. Rejecting a call - ignore an incoming call
  7. Call Waiting
  8. Three-way Calling - initiated from hands-free system
  9. Send Number During a Call - this is used when calling a menu-driven phone system
  10. Transfer a Call - transfer call from vehicle to cellular phone and visa versa
  11. Voice Pass-Thru - allow access to the voice recognition commands on the cellular phone

Pairing a Bluetooth ® Cellular Phone to the Vehicle

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone's information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

Once the Bluetooth ® cellular phone has been paired with vehicle, it will automatically connect to the vehicle when the ignition is on and the device is on. When more than one paired phone is in the vehicle, the phone with the highest priority will be connected. If the cellular phone is in use while getting into the vehicle, the phone can be switched to hands-free mode with the press of a button. In addition, a call in progress can be transferred from the vehicle hands-free mode to the phone to continue the call as the customer exits the vehicle.

Complete pairing instructions are provided in the Vehicle Owners Service Information.

Back-up Battery (If Equipped)

Note. Do not disconnect the main vehicle battery or remove the telematics communication interface control module fuse with the ignition key in any position other than OFF. Disconnecting power to the telematics communication interface control module in any way while the ignition is ON or with retained accessory power activated may cause activation of the OnStar® Back-Up Battery. This action is per design as the back-up battery is designed to provide power to the telematics communication interface module so an emergency notification call can be made after a vehicle collision where the main battery is disabled. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The back-up battery is not rechargeable and once activated the back-up battery must be replaced.

Certain OnStar® equipped vehicles may also be equipped with a back-up battery. The back-up battery is a non-rechargeable, lithium battery intended to provide an auxiliary power source for the telematics communication interface module in the event of a vehicle collision where power from the main vehicle battery is lost.

The back-up battery is intended to have a limited life span of approximately 4 years and is designed to maintain an open circuit voltage between 16V and 9V throughout this period. This allows the battery to power the basic functions of the telematics communication interface module for least one 200 second (5 minute) call at the end of the 4 year span, should a main vehicle battery loss collision occur.

The back-up battery is connected to the telematics communication interface module through the back-up battery positive voltage circuit and back-up battery ground circuit and is protected from a short circuit by means of an internal fuse. In the event the back-up battery positive voltage circuit is shorted to the back-up battery ground circuit or chassis ground, the fuse will open and render the back-up battery permanently inoperable. The status of the back-up battery and its associated wiring is monitored by the telematics communication interface module.

Audio System Interface

When the OnStar® requires audio output, a serial data message is sent to the audio system to mute all radio functions and transmit OnStar® originated audio. The OnStar® audio is transmitted to the vehicle audio system by a dedicated signal circuit and a low reference circuit.

The audio system will mute and an audible ring will be heard though the speakers if the vehicle receives a call with the radio ON.

On some vehicles, the HVAC blower speed may be reduced when the OnStar® system is active to aid in reducing interior noise. When the system is no longer active, the blower speed will return to its previous setting.

OnStar® Sleep Cycle

The OnStar® system uses a unique sleep cycle to allow the system to receive cellular calls while the ignition is in the OFF position and retained accessory power mode has ended. This cycle enables the telematics communication interface module to perform remote functions, such as door unlock, as commanded over the air by the OnStar® Call Center, and to continue to maintain an acceptable level of battery electrical drain.

The OnStar® system uses 4 states of readiness, depending upon the type of cellular market the vehicle is in when the ignition is put into the OFF state

  1. High power
  2. Low power
  3. Sleep
  4. Digital standby

The high power state is in effect whenever the ignition is in the ON or RUN position, or retained accessory power is enabled, and the OnStar® system is sending or receiving calls or when the system is performing a remote function.

The low power state is in effect when the OnStar® system is idle with the ignition in the ON or RUN position, or with retained accessory power enabled.

The sleep state is entered after the vehicle has been shut off and the retained accessory power has timed out while in an analog cellular area. At a predetermined time recorded within the telematics communication interface module, the system re-enters the low power state to listen for a call from the OnStar® Call Center for 1 minute. After this interval, the system will again return to the sleep state for 9 minutes. If a call is sent during the 1 minute interval, the OnStar® system will receive the call and immediately go into the high power mode to perform any requested functions. If no call is received during the 1 minute interval, the system will go back into the sleep mode for another 9 minutes. This process will continue for up to 48 hours, after which the OnStar® system will turn off until the ignition is turned to the ON or RUN position.

The digital standby power state is entered after the vehicle has been shut off and the retained accessory power has timed out while in a digital cellular area. When in digital standby mode, the OnStar® module is able to perform all remote functions as commanded by an OnStar® advisor at any time, for a continuous 48 hours. After 48 hours, the OnStar® module will go into sleep mode until a wake up signal from the vehicle is seen by the telematics communication interface module. If the OnStar module loses the digital cellular signal it will revert to analog mode and follow the standard sleep state (9 minutes OFF, 1 minute standby) based on the time of the GPS signals, this will continue until a digital cellular signal is again received.

If the OnStar® system loses battery power while the system is in a standby or sleep mode, the system will remain OFF until battery power is restored and the ignition is turned to the ON or RUN position.

Features

OnStar® Personal Calling

The hands free, OnStar® personal calling cellular phone feature is an additional feature of the OnStar® system. This feature is embedded within the telematics communication interface module; however it must be activated by an OnStar® advisor. OnStar® personal calling operates similar to most hand held cellular phones in that the availability for its usage is based on minutes or units. The customer must have a current OnStar® subscription, as this feature cannot be utilized without it. To use OnStar® personal calling, the customer must also purchase units (minutes) as outlined in the owners guide provided with the OnStar® system. Units begin to deplete, 1 unit is equal to 1 minute, as the customer makes outbound phone calls, answers inbound phone calls, or while connected to the OnStar® virtual advisor. In addition, units may also have an expiration date, depending upon the type of units purchased.

Customers have the ability to store telephone numbers within the module, referenced by a nametag for the convenience of frequently dialed numbers. After storing a nametag, the user can dial this number by initiating the OnStar® personal calling feature, speaking the word "call," and repeating the nametag assigned.

Customers have the capability to lock their OnStar® personal calling system by pressing the answer/end call button, speaking "security" and entering a 4-digit code. Once this process is complete, the user must enter the code before OnStar® personal calling is available. In the event the customer cannot remember their code and is unable to use their system, they can press the blue OnStar® button and speak to an advisor to unlock the system by means of a discrete cellular call to the vehicle.

Turn by Turn Navigation

Turn by Turn Navigation allows the driver to contact OnStar® to obtain directions for driving from a current location to a desired location. The Turn by Turn Navigation system stores your planned route and continually checks your position along that route, when you deviate from the planned route, the system will recognize this and prompt the driver with verbal prompts for how to proceed. The driver then responds verbally to direct the system to continue the current routing or to recalculate the route because of a missed turn. On some vehicles, the Turn by Turn Navigation instructions may be displayed to the driver in the radio display or the driver information center.

OnStar® Stolen Vehicle Slowdown (If equipped)

OnStar® Stolen Vehicle Slowdown allows advisors working with law enforcement services to send a signal to limit fuel flow to the engine, gradually slowing down the stolen vehicle.

Stolen Vehicle Slowdown is an enhancement to OnStar's Stolen vehicle Location Assistance, which uses Global Positioning Technology to pinpoint the location of a vehicle reported stolen. Stolen Vehicle Slowdown is powered by OnStar's new generation of hardware (Generation 8).

Advisor Record Feature

The Advisor Record Feature allows the user to store any information given during a call with an OnStar® Advisor. Recording is activated by pressing the blue OnStar button during a call; pressing the button a second time stops the recording. The stored information can be played back by pressing the phone button and using the voice command "Advisor Playback".

Deactivated OnStar® Accounts

In the event a customer has not renewed their OnStar® account after expiration or the account was never activated, OnStar® will make a discrete cellular call to the vehicle to deactivate the OnStar® system. Before taking this action, customers are notified that the OnStar® system in their vehicle will be deactivated unless they elect to renew the account. After the OnStar® account has been deactivated, customers will experience the following

  1. The OnStar® status LED will not illuminate.
  2. The OnStar® system will NOT attempt to connect to the OnStar® Call Center in the event of a collision or if the vehicle front air bags deploy for any other reason.
  3. An emergency button press will play a demo message indicating the service has been deactivated.
  4. An OnStar® Call Center button press will connect the customer with a dedicated sales team who can sell an OnStar® subscription and reactivate the vehicle. Depending on the type of OnStar® hardware in the vehicle, the customer may first hear a demonstration message stating there is no current OnStar® subscription for the vehicle, and directing the customer what to do to activate services.
  5. OnStar® personal calling will not be available, as this feature requires the customer to have a current OnStar® account. Attempts to use this feature may result in cellular connection failure messages and the inability to connect to the number dialed.

Certain vehicles that have never had an active OnStar® account, or that have been deactivated, may be unable to establish a connection with the OnStar® Call Center. When normal published diagnostic procedures do not indicate a possible cause for the no connect concern, the vehicle may have been deactivated. For deactivated vehicles, a no connect response should be considered normal operation. Further diagnosis and subsequent repair is only necessary should the customer elect to become an active OnStar® subscriber or renew the account subscription.

OnStar® Cellular, GPS, and Diagnostic Limitations

The proper operation of the OnStar® System is dependent on several elements outside the components integrated into the vehicle. These include the National Cellular Network Infrastructure, the cellular telephone carriers within the network, and the GPS.

The cellular operation of the OnStar® system may be inhibited by factors such as the users range from an analog or digital cellular tower, the state of the cellular carrier's equipment, and the location where the call is placed. Making an OnStar® key press in areas that lack sufficient cellular coverage or have a temporary equipment failure will result in either the inability of a call to complete with a data transfer or the complete inability to connect to the OnStar® Call Center. The OnStar® system may also experience connection issues if the identification numbers for the module, station identification number, electronic serial number or manufacturers electronic ID, are not recognized by the cellular carriers local signal receiving towers.

The satellites that orbit earth providing the OnStar system with GPS data have almost no failures associated with them. In the event of a no GPS concern, the failure will likely lie with the inability of the system to gain GPS signals because of its location, i.e. in a parking structure, hardware failure, or being mistaken with an OnStar® call which has reached the Call Center without vehicle data.

During diagnostic testing of the OnStar® system, the technician should ensure the vehicle is located in an area that has a clear unobstructed view of the open sky, and preferably, an area where analog or digital cellular calls have been successfully placed. These areas can be found by successfully making an OnStar® keypress in a known good OnStar® equipped vehicle and confirming success with the OnStar® Call Center advisor. Such places can be used as a permanent reference for future OnStar® testing.

Mobile Identification Number and Mobile Directory Number

The telematics communication interface module utilizes 2 numbers for cellular device identification, call routing and connection, a mobile identification number and a mobile directory number. The mobile identification number represents the number used by the cellular carrier for call routing purposes while the mobile directory number represents the number dialed to reach the cellular device.

Operation of the OnStar® Speech Recognition Systems

OnStar® users communicate with 2 speech recognition systems. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over a phone line. The computer tries to understand the users command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

  1. Personal Calling uses a speech recognition system that resides in the vehicle. When the user presses the phone button, the system states, Ready, and listens for the user command. The user can speak commands to control the hands-free phone.
  2. Virtual advisor is a remote speech recognition system that the caller can access by making a phone call. The user connects to virtual advisor by requesting it during personal calling use. The user is then transferred to the virtual advisor server and talks to it via a cellular connection.

The OnStar® speech recognition systems use speech technology that is designed to understand a wide range of American English speakers. Although there is no one right way to speak English, the system will work best when users try to modify their pronunciation should they encounter difficulty. Users who do not obtain good results are advised to try the tips and workarounds found in this section.

ConcernTip for Better Result
NoiseNoise may confuse the speech recognition system. You usually get better performance from the system in quieter conditions: The HVAC fan creates noise. Turn it down or OFF for better speech system performance. Driving at high speeds creates louder engine noise and wind noise. You may get better results at lower speeds. An open window or an open sunroof allows more noise to enter the vehicle. Close all windows for better results. Noisy rainstorms can also reduce performance. If passengers are talking while you use the speech system, it may be confused by their speech. You will get better results if all occupants of the vehicle are quiet while the system is listening for commands.
When to SpeakIn Personal Calling, the system is only listening after it prompts you to speak. When the system prompts you to speak, you have about 5 seconds to respond. If the system does not hear a response, it will prompt you again, or cancel the transaction. If you begin to speak too soon, it will tell you "Slower, please." Try pausing for a half second before speaking. In the Virtual Advisor, the system is always listening for commands, even while it is speaking.
How to SpeakSpeak forcefully, and clearly. The noisier the environment, the louder you need to speak. If you are in the driver seat, speak facing the front of the car. If you are a passenger, speak facing the rearview mirror. Speak calmly, and naturally. The system may sometimes fail your repeated attempts to give a command. If your speech is distorted by shouting or frustration, this may cause more errors. People with high-pitched voices may have better results by speaking in a deeper, lower-pitched voice. However, do not lower the volume of the voice. Avoid speaking with a rising intonation, like asking a question. Use a flat or falling intonation, like giving an answer.
What to SayPersonal Calling: One-word commands The Personal Calling system listens for only one word at a time. There are some exceptions, 2-word phrases that are spoken and understood as a single word, e.g. "virtual advisor", "voice feedback", and "my number". You can enter phone numbers only one digit at a time, and the system repeats each digit as it hears it. Say "Help" at the Ready prompt to hear the list of Personal Calling commands. Virtual Advisor can understand sentences with more than one word. It also expects to hear a 4-digit number all at once when it asks for your PIN. Say, "What are my choices?" to hear a list of commands that the Virtual Advisor understands.
Entering a phone numberIf you have trouble getting numbers correctly into the system, store your frequently-called number in the directory, so the system will remember them. After you have stored a number with a nametag, then you simply say "call" and the nametag in order to call the number. If the system cannot understand your numbers, ask another person to help you enter your frequently-called numbers. This person can speak the numbers, then you can speak the nametag.
Storing or dialing a numberWhen you have finished speaking your phone number, you do not need to say "store" or "dial" to indicate that you are done. If you pause and say nothing, the system will ask you if you want to store or dial. Say "yes".
Creating nametagsShort nametags that are similar may be easily confused by the system. You may get better recognition of your nametags if you make them longer, for example "George Washington" without pause, instead of "George" only. If you want to use nametags while driving, it is best to store the nametag with some vehicle noise in the background. If you are in park while you are storing nametags, you can turn the fan on low or open windows in order to create some background noise.
Virtual Advisor 4-digit PINSay the 4 digits in a natural way, without pausing between digits.
InterruptingWhen the Virtual Advisor is speaking, you can interrupt it with another command. The first word in your command helps to get its attention. If the Virtual Advisor has trouble understanding your commands when you interrupt, try speaking the first word loudly and clearly, then pause for an instant, then continue with the rest of the command. For example: "Get... my weather" or "Lookup... a quote for General Motors".

General Tips for Better Speech Recognition

Radio/Audio System Description and Operation

The entertainment system on this vehicle may have several different configurations available to it. To determine the specific configuration of the vehicle, please see the Service Parts ID Label, and refer to RPO Code List .

The entertainment system on this vehicle is configured with either a base or an uplevel system. The base and uplevel systems each contain a radio, antenna, speakers, and on some systems an audio amplifier. The uplevel system differs from the base system by providing the customer with enhanced audio system features.

Each item in the list below represents topics covered in detail below.

  1. Radio Circuit Operation
  2. Radio/HVAC Communications
  3. Radio/HVAC Controls
  4. Antenna System
  5. AM/FM Reception
  6. Digital Radio Receiver (If equipped)
  7. Speaker Operation
  8. Audio Amplifier (If equipped)
  9. Radio Data System (RDS)
  10. Theft Deterrent
  11. OnStar ®
  12. Steering Wheel Controls (If equipped)
  13. Auxiliary Audio Input Jack (If equipped)
  14. USB Port (If equipped)
  15. Multimedia Player Interface Module (If equipped)
  16. Speed Controlled Volume (SCV) (If equipped)

Radio Circuit Operation

Radio Power

The radio does not use a discrete ignition feed circuit for power moding. The power mode master provides the system power mode to the radio via serial data messages. The power mode master determines the system power mode by processing power mode information from ignition switch inputs. Serial data power modes supported by the radio are OFF, ACCESSORY, RUN, and CRANK REQUEST.

Radio Grounds

The vehicle harness provides a ground for the radio circuits. The radio may also be case grounded.

Radio Data Link Communication

The radio communicates with other modules via serial data.

Radio Audio Outputs

Each of the audio output channel circuits (+) and (-), at the radio have a DC bias voltage that is approximately one half of battery voltage. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

Remote Enable Output

The remote enable circuit is a discrete 12 V signal supplied to infotainment system components when the radio is producing audio, needs the front display on, needs video entertainment system components on, or needs to produce chimes. This signal is used to control the power state of the components. There is no output on radio the remote enable circuit when the vehicle is in the CRANK powermode, this is to minimize current consumption from the attached modules and also to avoid audio pops during crank events.

Scheme 31

Scheme 31: Radio/HVAC Communications
Scheme 31: Radio/HVAC Communications
CalloutComponent Name
1Radio Controls
2Info Display Module
3Radio
4HVAC Control Module
5Data Link Connector
6HVAC Controls
AGMLAN
BLocal Interconnect Network-HVAC
CCAN Graphical Interface
DLocal Interconnect Network-Radio

The radio controls are a separate component from the radio. The radio controls contain the radio control knobs and buttons for all audio functions.

The radio controls operate radio functions through serial data messages. The radio controls communicate to the info display module through LIN serial data. The info display module communicates to the radio through CGI serial data.

When equipped with the optional navigation radio, the radio controls communicate directly to the navigation radio.

Messages communicated between the radio, the radio controls, and the info display include the following

  1. Button presses/knob rotations
  2. Info display module dimming
  3. Radio controls back-lighting
  4. Graphics and text information

The HVAC controls are a separate component from the radio controls. HVAC data for controls and status indicators is communicated between the HVAC controls and the HVAC control module with a separate LIN serial data circuit. HVAC status screen information from the HVAC control module is transmitted to the radio on the GMLAN serial data circuit. The radio then displays the desired screen information on the info display using the video data circuits.

Antenna System

Multi-Band Antenna

The multi-band antenna is located on the roof of the vehicle. This type of antenna may be used with the AM/FM radio, but is primarily for OnStar® cellular and GPS signals and the XM™ Satellite Radio Service System, if the vehicle has these features. Keep this antenna clear of snow and ice build up for clear reception. If the vehicle has a sunroof, the performance of the system may be affected if the sunroof is open. Loading items onto the roof of the vehicle can interfere with the performance of the system, ensure the multi-band antenna is not obstructed.

The radio antenna is enabled when the radio is turned on. The radio provides battery voltage to the antenna using the center conductor of the antenna coaxial cable. This DC voltage does not affect the incoming radio signal. When a 12 V signal is seen by the on the center conductor of the antenna coax, both AM and FM signals are amplified.

AM/FM Reception

Radio Signal

The radio signal is sent from a broadcast station and is then received by an antenna. The strength of the signal received depends on the following

  1. The power output (wattage) of the broadcasting station
  2. The location of the vehicle (or receiver) relative to the broadcast tower.
  3. Obstacles between the tower and the receiver
  4. Atmospheric conditions
  5. What band (AM or FM) the station is broadcasting
  6. Type of antenna and the ground plane

AM Reception

The AM band has a lower frequency range than the FM band. These longer wavelengths

  1. Bend around Obstacles
  2. Follow the curvature of the earth
  3. May reflect off the ionosphere (skip)

The AM frequencies have longer range due to the ground wave. The ground wave follows the curvature of the earth and is effected by its conductivity. Greater conductivity equates to less signal loss thus transmission over water is better than over land. The AM band has a range of 80-320 km (50-200 miles).

FM Reception

The shorter wavelengths of the higher frequency FM band

  1. Reflect off obstacles
  2. Are absorbed by the ground
  3. Penetrate the ionosphere

Broadcasts in the FM band are limited to line of sight reception which is typically 40 km (25 miles). Even when out of a direct line of sight, the signal may be reflected into areas that would be in a shadow otherwise. Factors which affect the line of sight include

  1. Height of the broadcast antenna
  2. Height of the receiving antenna
  3. Terrain and buildings in the broadcast path

Digital Radio Receiver (If equipped)

The XM satellite radio is integrated into the radio. XM satellite radio provides digital radio reception. The XM signal is broadcast from two satellites and, where necessary, terrestrial repeaters. The high power satellites allow the antenna to receive the XM signal even when foliage and other partial obstructions block the antennas view of the satellite. Terrestrial repeaters are used in dense urban areas. These repeaters will receive the satellite signal and re-broadcast them at much higher power levels in order to ensure reception in areas with densely packed tall buildings. A service fee is required in order to receive the XM service.

Speaker Operation

Speakers turn electrical energy into mechanical energy to move air, using a permanent magnet and an electromagnet. The electromagnet is energized when the radio or amplifier (if equipped) delivers current to the voice coil on the speaker. The voice coil will form a north and south pole that will cause the voice coil and the speaker cone to move in relation to the permanent magnet. The current delivered to the speaker is rapidly changing alternating current (A/C). This causes the speaker cone to move in two directions producing sound.

Audio Amplifier (If equipped)

Amplifier Interface

A fused battery voltage circuit provides the main amplifier power. A switched 12 V output from the radio is used to control the power - state of the amplifier. To respond quickly to audio input and control signals, the amplifier is ON in all vehicle power modes except OFF and CRANK Request. The internal amplifier bridges are fully powered and unmuted when the amplifier receives the switched 12 V input.

Amplifier Operation

The purpose of the amplifier is to increase the power of a voltage or current signal. The output signal of an amplifier may consist of the same frequencies as the input signal or it may consist of only a portion of the frequencies as in the case of a subwoofer or midrange speaker. The radio creates a low level stereo audio output signal, which is sent at the user-defined volume level to the audio amplifier. The audio amplifier amplifies the signal and sends it to the appropriate speakers. Each of the audio output channel circuits (+) and (-), from the amplifier have a DC bias voltage that is approximately one half of battery voltage. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. The frequency (Hz) of the AC voltage signal is directly related to the frequency of the input (audio source playing) to the audio system. Both the DC bias voltage and the AC voltage signals are needed for the audio system to properly produce sound.

Radio Data System (RDS)

The radio may be equipped with the Radio Data System (RDS). The RDS feature is available only on FM stations that broadcast RDS information. This system relies upon receiving specific information from these stations and only works when the information is available. While the radio is tuned to an FM-RDS station, the station name or call letters display.

RDS data is carried in what is known as a "subcarrier". A subcarrier is a frequency that the FM broadcaster is authorized to use to send data that is not audible in the main audio program.

  1. RDS functions will only work with FM broadcast stations that are broadcasting RDS data.
  2. Not all FM Broadcast stations broadcast RDS data or offer all of the RDS services.
  3. The information displayed is dependent upon the information broadcast by the particular station. The information may vary greatly between stations.
  4. RDS functions may not work properly when reception is weak, reception is of poor quality, or RDS is not implemented properly by the FM Broadcaster.
  5. In some cases, a radio station broadcasting incorrect information may cause the RDS features of the radio to appear to work improperly.

With RDS, the radio can do the following

  1. Seek to stations broadcasting the selected type of programming
  2. Receive announcements concerning local and national emergencies
  3. Display messages from radio stations
  4. Receive alert warnings of local or national emergencies. When an alert announcement comes on the current radio station, ALERT! displays. You will hear the announcement, even if the volume is low or a CD is playing. If a CD is playing, play stops during the announcement. Alert announcements cannot be turned off. ALERT! is not affected by tests of the emergency broadcast system. This feature is not supported by all RDS stations.

RDS may display text information such as

  1. The name of the station.
  2. The type of program.
  3. General information such as artist and song title, call in phone numbers, etc.

Theft Deterrent

The radio theft deterrent system is intended to disable or limit radio functionality if incorrect vehicle information is received by the radio. The radio disables functionality if the VIN information received by the radio does not match the VIN information that has been learned by the radio. The radio receives this information via serial data. A possible cause of incorrect VIN info could be the radio was originally installed in another vehicle.

The radio has the following theft operating modes as part of the theft deterrent system

  1. Normal Mode: The radio has learned a correct VIN sequence and the VIN information received via serial data matches the learned VIN sequence. In this mode the radio has full functionality.
  2. No VIN Mode: The radio has not received or learned a correct VIN sequence. In this mode the radio has limited functionality.
  3. Theft Detected Mode: The radio has learned a correct VIN sequence and the VIN information received via serial data does NOT match the learned VIN sequence. In this mode the radio may be disabled or have limited functionality. The radio display will indicate that theft protection is active.

OnStar ® (If equipped)

When OnStar is activated, a serial data message is sent to the radio that activates a software program. When the software begins its process, the fade goes to the front, Bass and Treble are set to the mid range, the outputs are mono, and the audio source is OnStar. OnStar takes priority over any other audio source. All of these actions are preset values stored in the radio.

For additional OnStar information, refer to OnStar Description and Operation .

Steering Wheel Controls (If equipped)

Some audio functions are available using the steering wheel controls. The steering wheel controls duplicate the function of the primary controls available on the radio.

For additional information on steering wheel controls, refer to Steering Wheel Controls Description and Operation .

Auxiliary Audio Input Jack (If equipped)

The infotainment system may have a 3.5mm (1/8 in.) auxiliary audio input jack located in the center console. The auxiliary audio input jack may interface directly with the radio, or be connected to the infotainment system via a Multimedia Player Interface Module. When a portable audio playback device is connected to the auxiliary jack, an internal switch detects the connection and the radio will switch to AUX as the audio source. Audio signals from the device are sent to the radio from the auxiliary jack via the left, right, and common audio signal circuits.

  1. When a device is first connected to the 3.5mm (1/8 in.) input jack the infotainment system automatically switches to that device. If an auxiliary device has already been connected, press the AUX or CD/AUX button to select the device.
  2. Playback of an audio device that is connected to the 3.5mm jack can only be controlled using the controls on the device.
  3. The volume control on the device may need to be adjusted to ensure sufficient playback volume through the infotainment system.

USB Port (If Equipped)

The infotainment system may have a USB connector located in the center console. The USB connector may interface directly with the radio, or be connected to the infotainment system via a Multimedia Player Interface Module. The USB connector supports both USB standards 1.1 and 2.0.

USB Supported Devices

  1. USB Flash Sticks (Thumb Drives)
  2. Portable USB Hard Drives
  3. Portable Digital Media Players (iPOD®, ZUNE®, etc)

Depending on the USB device, some devices may not be recognized, or some features/functions may not be able to be controlled with the radio controls. USB HUB devices are not supported.

Multimedia Player Interface Module (MPIM) (If Equipped)

The vehicle may be equipped with a Multimedia Player Interface Module. This module can receive signals via the USB connector, the auxiliary audio input jack, or a Bluetooth® connection. This module receives the incoming signals, then sends the signals as analog audio inputs to the radio.

To allow the radio controls to be used to control portable media devices (USB, Bluetooth, iPOD®, ZUNE®, etc); the MPIM translates the USB signals to GMLAN signals to allow the bi-directional communication between the radio and the device. Depending on the device, some devices may not be recognized, or some features/functions may not be able to be controlled with the radio controls. USB HUB devices are not supported.

Speed Compensated Volume (If equipped)

With Speed Controlled Volume (SCV), the audio system will adjust automatically to make up for road and wind noise as you drive, by increasing the volume as vehicle speed increases. To use SCV, set the volume at the desired level, and then select either Low, Medium, or High. To turn SCV off, select the Off screen button.

Special Tools

Illustration Tool Number/Description EL 50334-50 USB Cable and Adapter Kit EL-48028 Digital Radio Test Antenna EL-49903 OnStar Antenna Diagnostic Tool Kit

Scheme 32

Scheme 32: Special Tools
Scheme 32: Special Tools

Scheme 33

Scheme 33
Scheme 33

Scheme 34

Scheme 34
Scheme 34

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS -- INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Driver Information Display Replacement (UDN)
• Test Probe Caution
• Inside Rearview Mirror Replacement
• Checking Aftermarket Accessories
• Diagnostic Trouble Code (DTC) List - Vehicle
• Steering Wheel Controls Malfunction
• Battery Negative Cable Disconnection and Connection
• Instrument Panel Lower Trim Panel Replacement - Left Side
• Fastener Caution
• Rear Compartment Side Trim Panel Replacement (without HP6)
• Headlining Trim Panel Replacement (With Sunroof)
• Steering Wheel Spoke Lower Cover Replacement
• RPO Code List
• Steering Wheel Controls Description and Operation
• DTC B0000
• Radio/Audio System Description and Operation
• Speaker Replacement Reference
• OnStar Description and Operation
• EL-49903
• Circuit/System Testing (without Navigation Radio)
• Navigation System Description and Operation
• OnStar Steering Wheel Control Functions Malfunction