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Contents Wiring diagrams Section: Entertainment Systems All sections

Cellular System, Entertainment System, and Navigation System Chevrolet Corvette C6

Entertainment Systems 24 illustrations ~23924 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
Antenna Buffer Retaining Screws1.8 N.m16 lb in
Antenna Module Retaining Screws1.8 N.m16 lb in
Bose® Signal Processing Module Retaining Bolts2.5 N.m22 lb in
Communication Interface Module Screw2 N.m18 lb in
Front Door Speaker Assembly Retaining Screws (Tighten in Sequence)2.5 N.m22 lb in
Front Windshield Antenna Coaxial Cable Ground Wire Bolt1.8 N.m16 lb in
Ignition Switch Retaining Bolts5.5 N.m49 lb in
Negative Battery Cable Bolt15 N.m11 lb ft
Radio Control Retaining Screws2.5 N.m22 lb in
Radio Fixed Antenna Long Braided Ground Strap Retaining Nut5.8 N.m51 lb in
Radio Fixed Antenna Mast5 N.m44 lb in
Radio Fixed Antenna Retaining Nuts12 N.m106 lb in
Radio Fixed Antenna Short Braided Ground Strap and Dual Cable Strap Retaining Nut5.8 N.m51 lb in
Radio Power Antenna Bracket Retaining Bolts10 N.m89 lb in
Radio Power Antenna Bracket Retaining Nuts12 N.m106 lb in
Radio Power Antenna Long Braided Ground Strap Retaining Nut5.8 N.m51 lb in
Radio Power Antenna Short Braided Ground Strap and Dual Cable Strap Retaining Nut5.8 N.m51 lb in
Rear Speaker Retaining Screws2.5 N.m22 lb in
Remote CD Changer Mounting Bracket Bolts1.9 N.m17 lb in
Remote CD Changer Mounting Nuts12 N.m106 lb in
Tail Lamp Retaining Screws2 N.m18 lb in

Scheme 1

Scheme 1: Radio/Navigation System Schematics
Scheme 1: Radio/Navigation System Schematics

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10: OnStar Schematics
Scheme 10: OnStar Schematics

Scheme 11

Scheme 11
Scheme 11

DIAGNOSTIC CODE INDEX

DTCDescription
DTC B0001B0001: Vehicle Speed Information Circuit Range/Performance
DTC B1025, B1035, B1045, or B1055B1025: Audio Output Circuit Shorted to Battery or Ground
DTC B1259B1259: Antenna Ground Circuit
DTC B125A or B125BB125A: Antenna 1 Circuit Left B125B: Antenna 2 Circuit Right
DTC B1271B1271: Theft Locked
DTC B2455B2455 00: Cellular Phone Microphone Circuit
DTC B2461B2461: Navigation ECU Synchronous Signal Error
DTC B2462B2462: Global Positioning System (GPS) Signal Error
DTC B2470B2470 00: Cellular Phone Antenna Circuit Malfunction
DTC B2474B2474 07: Navigation Display Head Backlighting Performance
DTC B2476 or B2482B2476 00: Cellular Phone Select Service Switch B2482 00: Cellular Phone Select Service Switch Range/Performance
DTC B2483 or B2484B2483 00: Global Positioning System (GPS) Antenna Malfunction Short to Ground B2484 00: Global Positioning System (GPS) Antenna Malfunction Open Circuit
DTC B2485B2485: Wireless Communication Antenna Circuit (Bluetooth)

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Cellular, Entertainment, and Navigation

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information

  1. The identification of the control modules which command the system
  2. The ability of the control modules to communicate through the serial data circuit
  3. The identification of any stored DTCs and their status

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Vehicle Speed Signal CircuitP0608*P0608*P0608*B0001
*. Speedometer and/or Odometer Inaccurate or Inoperative

Circuit/System Description

The engine control module (ECM) creates the vehicle speed output signal by pulsing the circuit to ground at a rate of 4 KPPM. The VSS input is pulled high to B+ in the radio. The ECM monitors the voltage at the vehicle speed signal circuit to determine when the voltage is out of the normal operating range.

Conditions for Running the DTC

  1. Vehicle speed must exceed 4 km/h (2.5 mph) after receiving a global positioning system (GPS) signal.
  2. Engine speed is more than 400 RPM.
  3. Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The navigation radio compares the vehicle speed signal from the ECM to the GPS location signal every second. If the GPS signal indicates that the vehicle has traveled 4 km (2.5 mph) but no vehicle speed signal was received, the radio sets the DTC.

Action Taken When the DTC Sets

The navigation radio may exhibit the following conditions when a fault is present

  1. The vehicle icon may jump to different positions on the map screen.
  2. The vehicle icon, current position marker may not move on the map screen while the vehicle is being driven.
  3. The route guidance accuracy may be degraded.

Conditions for Clearing the DTC

  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.

Reference Information

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

IMPORTANTThe drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to Lifting and Jacking the Vehicle .
  1. Ignition OFF, disconnect the X2 harness connector at the radio.
  2. Engine ON, drive wheels raised, place the vehicle in drive or first gear. With a scan tool, verify the speedometer value matches the scan tool vehicle speed parameter in the ECM engine data list. If the speedometer matches the scan tool vehicle speed parameter, test the vehicle speed signal circuit terminal D for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the radio.
  1. If the speedometer does not match the scan tool vehicle speed parameter, refer to «Speedometer and/or Odometer Inaccurate or Inoperative»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges) .

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Low Level Audio Signal (+)B1025*1B1025*
Low Level Audio Signal (-)B1025*1B1025*
1. No or reduced sound from speaker * Noticeable audio distortion possible

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V 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. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher.

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

The DTC will set when the radio detects a short to voltage or short to ground in any of the low level audio signal circuits (+) and (-).

No sound is present from one or more of the speakers.

  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing RPO U66

  1. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground. Left front low level audio signal (+) terminal A7 Left front low level audio signal (-) terminal A6 Right front low level audio signal (+) terminal B6 Right front low level audio signal (-) terminal B7 Left rear low level audio signal (+) terminal A4 Left rear low level audio signal (-) terminal A5 Right rear low level audio signal (+) terminal B5 Right rear low level audio signal (-) terminal B4 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. If all circuits test normal, replace the audio amplifier.

Circuit/System Testing RPO U65

  1. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground. Left front low level audio signal (+) terminal B10 Left front low level audio signal (-) terminal B9 Right front low level audio signal (+) terminal B8 Right front low level audio signal (-) terminal B7 Left rear low level audio signal (+) terminal B6 Left rear low level audio signal (-) terminal B5 Right rear low level audio signal (+) terminal B4 Right rear low level audio signal (-) terminal B3 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. If all circuits test normal, replace the audio amplifier.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Speaker Replacement Reference»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for audio amplifier and radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage11
Left Audio Signal (+)222
Right Audio Signal (+)333
Audio Common Signal (-)444
Left Digital Radio Antenna CoaxB125A, B1259B125A, B1259B125A, B1259
Right Digital Radio Antenna CoaxB125B, B1259B125B, B1259B125B, B1259
Ground1
1. No communication with DRR/XM not available 2. No or distorted audio from left side speakers when listening to digital radio 3. No or distorted audio from right side speakers when listening to digital radio 4. No or distorted audio from all speakers when listening to digital radio

The digital radio receiver (DRR) receives XM satellite radio signals via 2 digital radio antennas located in each of the outside rearview mirrors. The antenna circuits are coaxial cables that carry the digital radio signal information received by the antennas to the DRR. The antenna coax also provides a path for voltage to power the antennas. Separate left and right audio signals (+) are sent from the DRR to the radio. The radio processes these signals and passes them to the audio amplifier.

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

The DTC will set when the DRR detects a short to voltage, short to ground, or an open/high resistance in the antenna ground circuit.

Actions Taken When the DTC Sets

  1. Digital radio reception may be poor or not available.
  2. The radio displays "No XM Signal" or "Check Antenna".
  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48028 Digital Radio Test Antenna

Circuit System Verification

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 appropriate digital radio antenna coax from the digital radio receiver (DRR). Connect the EL-48028 to the DRR.
  2. Ignition ON, radio tuned to XM, verify DTC B1259 is not set as current. If the DTC is current, replace the DRR.
  3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the appropriate digital radio antenna.
  4. Ignition ON, test for 4.5-5.5V between the antenna coax center terminal and the coax outer shield. If not within the specified range, replace the antenna coax.
  5. If all circuits test normal, replace the appropriate digital radio antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Digital Radio Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__digital-radio-antenna-replacement)
  2. «Digital Radio Antenna Cable Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Digital Radio Antenna Cable Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for DRR replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage11
Left Audio Signal (+)222
Right Audio Signal (+)333
Audio Common Signal (-)444
Left Digital Radio Antenna CoaxB125A, B1259B125A, B1259B125A, B1259
Right Digital Radio Antenna CoaxB125B, B1259B125B, B1259B125B, B1259
Ground1
1. No communication with DRR/XM not available 2. No or distorted audio from left side speakers when listening to digital radio 3. No or distorted audio from right side speakers when listening to digital radio 4. No or distorted audio from all speakers when listening to digital radio

The digital radio receiver (DRR) receives XM satellite radio signals via 2 digital radio antennas located in each of the outside rearview mirrors. The antenna circuits are coaxial cables that carry the digital radio signal information received by the antennas to the DRR. The antenna coax also provides a path for voltage to power the antennas. Separate left and right audio signals (+) are sent from the DRR to the radio. The radio processes these signals and passes them to the audio amplifier.

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

B125A

The DTC will set when the DRR detects a short to voltage, short to ground, or an open/high resistance in the antenna 1 circuit.

B125B

The DTC will set when the DRR detects a short to voltage, short to ground, or an open/high resistance in the antenna 2 circuit.

  1. Digital radio reception may be poor or not available.
  2. The radio displays "No XM Signal" or "Check Antenna".
  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48028 Digital Radio Test Antenna

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 appropriate digital radio antenna coax from the digital radio receiver (DRR). Connect the EL-48028 to the DRR.
  2. Ignition ON, radio tuned to XM, verify DTC B125A/B is not current. If the DTC is current, replace the DRR.
  3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the appropriate digital radio antenna.
  4. Ignition ON, test for 4.5-5.5V between the antenna coax center terminal and the coax outer shield. If not within the specified range, replace the antenna coax.
  5. If all circuits test normal, replace the appropriate digital radio antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Digital Radio Antenna Cable Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Digital Radio Antenna Cable Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Digital Radio Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__digital-radio-antenna-replacement)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for DRR replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit Description

This DTC is generated by the module when the Theft Lock is activated. This occurs when the VIN as received over the data communication circuit and the VIN as stored in the module memory do not match. This also occurs when no VIN is received over the data communication circuit. The only circuit required is the communication line.

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

This DTC is generated by the module when the VIN as received over the data communication circuit and the VIN as stored in the module memory do not match. This also occurs if no VIN is received over the data communication circuit.

The radio does not function. The radio will display indicate that Theftlock is active.

Re-calibration with the correct calibrations for the vehicle and cycling the radio to OFF then to ON will clear the DTC if there is no damage to the radio.

Diagnostic Aids

This DTC may be an indication that an incorrect radio is installed in the vehicle, or that the radio was replaced without reprogramming with the new information.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Verify DTC 1271 is not set.

  1. If the is set, program the radio. If the DTC resets, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provide an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Microphone SignalB2455 00B2455 00B2455 00
Cellular Microphone DrainB2455 001
1. OnStar Microphone Inoperative - Caller Cannot Be Heard

The communication interface module (CIM) provides the cellular microphone with a supplied voltage on the cellular microphone signal circuit. When the microphone is in use, voice data from the user is sent back to the CIM on the signal circuit. The CIM provides a ground for the microphone via the drain wire.

  1. The ignition must be in the RUN or ACC position.
  2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
  3. All the above conditions are present for greater than 10 seconds.
  1. The CIM detects an open, short to ground or short to voltage in the cellular microphone signal circuit for 10 seconds or greater.
  2. The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.
  1. The OnStar® status LED turns red.
  2. The CIM will not receive a signal from the 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Test for less than 10 ohms between the drain circuit terminal A and ground. If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. If all circuits test normal, replace the cellular microphone.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mobile Telephone Microphone Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The circuitry is internal to the navigation radio. The Navigation ECU performs self diagnostics and sets the a DTC if any malfunctions are detected.

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

The navigation radio has detected an internal ECU malfunction.

  1. No map or blue screen appears on the display and index is not usable.
  2. Navigation buttons do not function.
  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, with a scan tool clear all DTCs.
  2. Ignition ON, operate the navigation system within the Condition for Running the DTC. If the DTC resets, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The global positioning system (GPS) antenna is connected to the navigation radio by a shielded coaxial cable. The GPS antenna is powered through the same coaxial cable used to send signals to the navigation system. The antenna cable also provides a path for DC current for powering the GPS antenna.

  1. Radio ON
  2. Battery voltage between 9-16 volts
  3. The navigation radio tests the GPS antenna every 10 seconds

The DTC will set when the navigation radio detects a short to ground or an open/high resistance in 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.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

IMPORTANTThe global positioning system (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.
  1. Disconnect the GPS antenna coax cable from the navigation radio.
  2. Ignition ON, test for 4.5-5.5 volts between the radio coax cable connection center conductor and ground. If the reading is not within the specified range, replace the radio.
  3. If all circuits test normal, replace the GPS antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Electronic Navigation Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The cellular antenna is connected to the communication interface module (CIM) with a RG-58 coax cable. The CIM polls the data from the cellular antenna once every second.

  1. Ignition in the RUN or ACC position.
  2. System voltage is between 9.5 volts and 15.5 volts.
  3. The above conditions are present for greater than 1 second.
  1. The CIM does not detect the presence of a cellular antenna.
  2. The above conditions are present for greater than 1 second.
  1. The vehicle is unable to connect to the OnStar® Call Center.
  2. The OnStar® status LED turns red.
  1. The CIM detects the presence of a cellular 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that the cellular antenna and cellular antenna coupling assembly are not damaged.

  1. If the antenna assembly is damaged, replace the cellular antenna.
  1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
  2. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground. If greater than the specified range, replace the antenna coax.
  3. Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground. If greater than the specified range, replace the antenna coax.
  4. Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax
  5. Test for infinite resistance between the antenna coax outer shield and ground. If less than the specified value, replace the antenna coax
  6. Test for less than 5 ohms at the cellular antenna coax center terminal from end to end. If greater than specified value, replace the cellular antenna coax cable.
  7. Test for less than 5 ohms at the cellular antenna coax outer shield from end to end. If greater than specified value, replace the cellular antenna coax cable.
  8. Test for infinite resistance between the antenna coax center terminal and the outer shield. If less than specified value, replace the cellular antenna coax cable.
  9. If coax cable tests normal, replace the cellular antenna.
  10. Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set. If the DTC sets, replace the CIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Cellular and Navigation Antenna Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The internal backlighting of the navigation display screen located in the navigation radio.

  1. Radio ON.
  2. Battery voltage must be between 9-16 volts.
  1. The navigation radio tests the navigation display backlighting every 1 second.
  2. The radio determines there is a malfunction or overheat condition in the navigation display backlighting.

Navigation backlighting may be too bright, dim or blank.

  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.

Occasionally it is possible to overheat the navigation display backlighting due to excessive ambient heat inside the vehicle. In this instance it may be necessary to allow time for the display to cool.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, allow the navigation display to cool if the ambient temperature inside the vehicle is excessive and the radio is hot to the touch. Verify the navigation display is cool and the DTC has cleared and gone to history.
  2. Ignition ON, with a scan tool, clear all DTCs and operate the audio/navigation system within the Conditions for Running the DTC. Verify the DTC does not reset. If the DTC resets, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Keypad Supply VoltageB2476 00B2476 00B2476 00
Keypad Green LED Signal112
Keypad Red LED Signal112
Keypad Signal33B2482 00
Inside Rearview Mirror Ground1
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 communication interface module (CIM) supplies the OnStar® button assembly with 10 volts 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 CIM over the keypad signal circuit. Depending upon the voltage range returned, the CIM is able to identify which button has been activated.

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

B2476

The CIM detects a short to voltage, short to ground, or an open/high resistance on the keypad supply voltage circuit.

B2482

The CIM 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 CIM will set this DTC.

  1. The OnStar® status LED turns red.
  2. No calls can be placed.
  3. The CIM 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 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for less than 10 ohms between the mirror ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for less than 1 V between the keypad signal circuit terminal 11 and ground. If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. Ignition OFF, test for 600 K - 800 K ohms between the keypad signal circuit terminal 11 and ground. If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the CIM. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
  5. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal 12 and ground. If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the CIM. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  6. If all circuits test normal, test or replace the button assembly.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11. If less than the specified range, replace the inside rearview mirror.
  3. Test for 1.4 K - 1.6 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the black phone button. If not within the specified range, replace the inside rearview mirror.
  4. Test for 2.7 K - 3.3 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the blue On-Star® button. If not within the specified range, replace the inside rearview mirror.
  5. Test for 12.5 K - 13.5 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the red emergency button. If not within the specified range, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Inside Rearview Mirror Replacement (DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system) or «Inside Rearview Mirror Replacement (Except DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The communication interface module (CIM) receives information from a specific navigation antenna located on the outside of the vehicle. The navigation antenna is connected to the CIM via a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

  1. Ignition is in the RUN or ACC position.
  2. Battery voltage is between 9-16 volts.

B2483 00

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

B2484 00

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

  1. The OnStar® status LED turns red.
  2. The OnStar® Call Center cannot locate the vehicle.
  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Disconnect the navigation antenna coax cable from the CIM.
  2. Ignition ON, test for 4.5-5.5 V between the CIM coax cable center conductor terminal at the module and ground. If not within the specified range, replace the CIM.
  3. Reconnect the coax cable to the CIM. Disconnect the coax cable from the navigation antenna.
  4. Test for 4.5-5.5 V between the coax cable center conductor and the outer shield. If not within the specified range, replace the coax cable.
  5. If all circuits test normal, replace the navigation antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Cellular and Navigation Antenna Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The Bluetooth ® antenna is a small fixed antenna connected directly to the communication interface module (CIM) 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. Ignition ON.
  2. Battery voltage must be between 9-16 volts.
  3. The CIM tests the antenna once every second.

The CIM detects a short to ground or an open/high resistance in the Bluetooth ® antenna.

  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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify the Bluetooth ® antenna is properly connected to the CIM and is not damaged. If the antenna is disconnected or damaged, repair or replace as necessary.
  2. Ignition ON, verify the DTC B2485 is not set. If the DTC is set, replace the Bluetooth ® antenna. Clear the DTC and cycle the ignition OFF then back ON. If the DTC resets as current, replace the CIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Wireless Communication Interface Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

Symptoms - Cellular Communication

IMPORTANTThe following steps must be completed before using the symptom table.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) 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»(/chevrolet/corvette/c6-2004-2014/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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__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»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «OnStar Global Positioning System (GPS) Data Not Current or Inaccurate»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «OnStar Microphone Malfuncation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  4. «OnStar Audio Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  5. «OnStar Button LED Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  6. «OnStar Call Center Remote Function Requests Manfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  7. «OnStar Button Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  8. «Unable to Contact OnStar Call Center»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  9. «OnStar Voice Recognition Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  10. «OnStar Steering Wheel Control Functions Manfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-steering-wheel-control-functions-manfunction)

Symptoms - Entertainment

IMPORTANTThe following steps must be completed before using the symptom tables.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) , 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 «Radio/Audio System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__radioaudio-system-description-and-operation) in order to familiarize yourself with the system functions.
  1. Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to «Checking Aftermarket Accessories»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__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. «Digital Radio Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Noise Compensated Volume Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Radio Poor Reception»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  4. «Speaker Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Symptoms - Navigation Systems

IMPORTANTThe following steps must be completed before using the symptom tables.
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) , 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 «Navigation System Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__navigation-system-description-and-operation) in order to familiarize yourself with the system functions.
  1. Inspect for aftermarket devices which could affect the operation of the navigation system components. Refer to «Checking Aftermarket Accessories»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__checking-aftermarket-accessories) .
  2. Inspect the 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. «Navigation System - Voice Recognition Manfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «No Global Positioning System (GPS) Reception»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The Bluetooth ® antenna is a small fixed antenna connected directly to the communication interface module (CIM) 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 CIM 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.gm.com/vc/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. The GM Bluetooth ® test tool 453-U260-000-R 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify DTC B2485 is not set. If DTC B2485 is set, refer to «DTC B2485»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. Set up the GM Bluetooth ® test tool 453-U260-000-R or equivalent.
  3. Ignition ON, perform the discovery/search operation with the test tool. Verify the vehicle appears in the list of available devices. If the vehicle is not in the list of available devices, repeat the discovery/search operation. If the vehicle is still not in the list of available devices, replace the CIM.
  4. Follow the instructions provided in the Vehicle Owners Manual for pairing a device. Verify successful pairing with the test tool. If pairing is not successful, repeat the pairing process. If pairing is still not successful, replace the CIM.
  5. Refer to «Diagnostic Aids»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for CIM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
B+ Voltage11
Left Audio Signal (+)222
Right Audio Signal (+)333
Audio Common Signal (-)444
Left Digital Radio Antenna CoaxB125A, B1259B125A, B1259B125A, B1259
Right Digital Radio Antenna CoaxB125B, B1259B125B, B1259B125B, B1259
Ground1
1. No communication with DRR/XM not available 2. No or distorted audio from left side speakers when listening to digital radio 3. No or distorted audio from right side speakers when listening to digital radio 4. No or distorted audio from all speakers when listening to digital radio

The digital radio receiver (DRR) receives XM satellite radio signals via 2 digital radio antennas located in each of the outside rearview mirrors. The antenna circuits are coaxial cables that carry the digital radio signal information received by the antennas to the DRR. The antenna coax also provides a path for voltage to power the antennas. Separate left and right audio signals (+) are sent from the DRR to the radio. The radio processes these signals and passes them to the audio amplifier.

When diagnosing digital radio concerns, the vehicle should be located outside with an unobstructed view of the southern sky to ensure proper reception of the satellite signal. Reception may limited, intermittent or not possible inside structures or under heavy cover.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__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»(/chevrolet/corvette/c6-2004-2014/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. If the No XM Signal message is displayed or XM reception is poor, refer to «Digital Radio Antenna Circuit Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__digital-radio-antenna-circuit-malfunction) .
  3. Radio tuned to XM, use the radio balance function to transfer audio between the left and right side of the vehicle. Verify clear and even sound is heard from each side of the vehicle. If either side of the vehicle is not producing sound or the sound produced is distorted, refer to «Digital Radio Output Circuit Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__digital-radio-output-circuit-malfunction) .

Digital Radio Antenna Circuit Malfunction

  1. Ignition OFF, disconnect the appropriate digital radio antenna coax from the digital radio receiver (DRR). Connect the EL-48028 to the DRR.
  2. Ignition ON, radio tuned to XM, verify XM reception is clear and uninterrupted. If reception is not clear, replace the DRR.
  3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the appropriate digital radio antenna.
  4. Ignition ON, test for 4.5-5.5V between the antenna coax center terminal and the coax outer shield. If not within the specified range, replace the antenna coax.
  5. If all circuits test normal, replace the appropriate digital radio antenna.

Digital Radio Output Circuit Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the radio.
  2. Ignition ON, radio ON and tuned to XM, test for a varying mV AC voltage reading between the following signal circuit terminals listed below and ground. Left audio signal (+) - terminal J Right audio signal (+) - terminal H Audio common signal (-) - terminal K If the varrying mV A/C voltage reading is not present, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the DRR.
  3. If all circuits test normal, test or replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Digital Radio Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__digital-radio-antenna-replacement)
  2. «Digital Radio Antenna Cable Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Digital Radio Antenna Cable Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  3. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio or DRR replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The communication interface module (CIM) receives information from a specific navigation antenna located on the outside of the vehicle. The navigation antenna is connected to the CIM via a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

  1. The 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 vehicle communication interface module. Upon entering this screen, the GPS signal title will automatically 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 driving through tunnels or parking structures while making an OnStar® keypress will restrict the navigation antenna from a clear view of the satellites in the sky and may have caused this temporary data loss.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

IMPORTANTIt 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 the satellites. It is also necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes.
  1. Ignition ON, observe the GPS signal status indicator for at least 10 seconds with a scan tool. The indicator should display Yes. If the indicator does not display Yes, refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  2. Call and verify the OnStar advisor has received the GPS data. If the advisor did not receive the GPS data and the call was a 'fail to voice', contact the GM Technical Assistance Center. If the advisor did not receive the GPS data and the call was not a 'fail to voice", refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  3. Verify with the OnStar Call Center advisor that your actual position is within a reasonable distance from the actual location of the vehicle. If your actual position is not within a reasonable distance from the actual location of the vehicle, replace the CIM.
  1. Disconnect the navigation antenna coax cable from the CIM.
  2. Ignition ON, test for 4.5-5.5 V between the CIM coax cable center conductor terminal at the module and ground. If not within the specified range, replace the CIM.
  3. Reconnect the coax cable to the CIM. Disconnect the coax cable from the navigation antenna.
  4. Test for 4.5-5.5 V between the coax cable center conductor and the outer shield. If not within the specified range, replace the coax cable.
  5. If all circuits test normal, replace the navigation antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Cellular and Navigation Antenna Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Microphone SignalB2455 00B2455 00B2455 00
Cellular Microphone DrainB2455 001
1. OnStar Microphone Inoperative - Caller Cannot Be Heard

The communication interface module (CIM) provides the cellular microphone with a supplied voltage on the cellular microphone signal circuit. When the microphone is in use, voice data from the user is sent back to the CIM on the signal circuit. The CIM provides a ground for the microphone via the drain wire.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Test for less than 10 ohms between the drain circuit terminal A and ground. If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. If all circuits test normal, replace the cellular microphone.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Mobile Telephone Microphone Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The vehicle navigation radio and Onstar® system both utilize the cellular microphone to receive voice commands. The navigation radio receives an audio voice signal from the communication interface module (CIM).

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify the OnStar® voice recognition is operating normally.

  1. If the OnStar® voice recognition is inoperative, refer to «OnStar Microphone Malfuncation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  1. Ignition OFF, disconnect the X3 harness connector at the CIM.
  2. Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 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 radio. If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Ignition OFF, test for less than 10 ohms between the navigation voice low reference circuit terminal 4 and ground. If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
  4. Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 and the drain wire circuit terminal 5. If less than specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
  5. Ignition OFF, disconnect the X1 harness connector at the radio.
  6. Verify that a test lamp does not illuminate between B+ and the navigation voice low reference circuit terminal 5. If the test lamp illuminates, test the low reference circuit for a short to ground.
  7. If all circuits test normal, replace the CIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio and CIM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Cellular Telephone Voice Signal111
Cellular Telephone Voice Low Reference1
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 communication interface module (CIM) transmits signals to the audio system on the cellular telephone voice signal and cellular telephone voice low reference circuits.

Schematic Reference

  1. «OnStar Schematics»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Radio/Navigation System Schematics»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Tune radio to a known good station and verify the audio is heard clearly through all speaker channels. If audio is not heard clearly, refer to «Speaker Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  2. Ignition ON, radio ON, set volume to comfortable level and press OnStar® Call Center button. Verify Connecting to OnStar® message is heard clearly through the audio system. If OnStar® message is noisy or distorted, refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  1. Ignition OFF, disconnect the X2 harness connector at the radio.
  2. Ignition ON, test for a varying AC voltage between the following signal circuit terminals listed below and ground when the OnStar® Call Center button is pressed. Audio Signal Circuit- terminal M Audio Common Circuit- terminal L If AC voltage was not present, test the circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the CIM.
  3. If all circuits test normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The global positioning system (GPS) antenna is connected to the navigation radio by a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the GPS antenna.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. The global positioning system (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.

  1. Ignition OFF, disconnect the GPS antenna coax cable from the navigation radio.
  2. Ignition ON, test for 4.5-5.5 V between the coax cable center conductor terminal at the radio and ground. If not within the specified range, replace the radio.
  3. If all circuits test normal, replace the GPS antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Electronic Navigation Antenna Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The audio amplifier supplies 9 volts to the noise compensation microphone. The audio amplifier receives a signal from the noise compensation microphone to determine the amount of interior vehicle noise and adjusts the amplifier output to the speakers accordingly.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition OFF, disconnect the harness connector at the noise compensation microphone.
  2. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone signal circuit terminal B 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 audio amplifier. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
  3. Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone signal circuit terminal B and the drain wire circuit terminal A. If less than the specified range, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the audio amplifier.
  4. If all circuits test normal, replace the noise compensation microphone.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Radio Volume Compensator Interior Noise Microphone Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Audio Amplifier replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Keypad Supply VoltageB2476 00B2476 00B2476 00
Keypad Green LED Signal112
Keypad Red LED Signal112
Keypad Signal33
Inside Rearview Mirror Ground1
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative

The OnStar® status LEDs are located with the OnStar buttons. 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 communication interface module (CIM) via the keypad green LED signal circuit and the keypad red LED signal circuit.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Ignition ON, command the Green LED ON and OFF with a scan tool while observing the green LED on the inside rearview mirror. The green LED should turn ON and OFF when commanded.
  2. Command the red LED ON and OFF with a scan tool while observing the red LED on the inside rearview mirror. The red LED should turn ON and OFF when commanded.
  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Doors closed, courtesy lamps OFF, test for less than 5 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. Ignition ON, command the green LED OFF with a scan tool. Test for less than 1 volt between the control circuit terminal 14 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. Command the green LED ON with a scan tool. Test for greater than 9 volts between the control circuit terminal 14 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 CIM.
  5. Command the red LED OFF with a scan tool. Test for less than 1 volt between the control circuit terminal 15 and ground. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  6. Command the red LED ON with a scan tool. Test for greater than 9 volts between the control circuit terminal 15 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 CIM.
  7. If all circuits test normal, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Inside Rearview Mirror Replacement (DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system) or «Inside Rearview Mirror Replacement (Except DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The communication interface module (CIM) 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. 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

IMPORTANTIt 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. Verify that the horn, lights, and the doors locks on the vehicle operate properly. If the applicable system does not operate properly, refer to «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) .
  2. Contact the OnStar® Call Center by pressing the blue OnStar® button. Verify with the OnStar® advisor that all of the remote functions (door locks, lights, or horn) work. If unable to connect with the OnStar® call center, refer to «Unable to Contact OnStar Call Center»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If the remote functions do not operate when requested, replace the CIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for CIM replacement, setup, and programming

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Keypad Supply VoltageB2476 00B2476 00B2476 00
Keypad Green LED Signal112
Keypad Red LED Signal112
Keypad Signal33B2482 00
Inside Rearview Mirror Ground1
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 communication interface module (CIM) supplies the OnStar® button assembly with 10 volts 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 CIM over the keypad signal circuit. Depending upon the voltage range returned, the CIM is able to identify which button has been activated.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

Ignition ON, press the OnStar® Call buttons one at the time. Verify that all of the OnStar® buttons operate normally.

  1. If some OnStar® buttons are inoperative but not all, replace the inside rearview mirror.
  2. If none of the OnStar® buttons operate, refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for less than 10 ohms between the mirror ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for less than 1 V between the keypad signal circuit terminal 11 and ground. If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. Ignition OFF, test for 600 K - 800 K ohms between the keypad signal circuit terminal 11 and ground. If less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the CIM. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
  5. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal 12 and ground. If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the CIM. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  6. If all circuits test normal, test or replace the button assembly.
  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11. If less than the specified range, replace the inside rearview mirror.
  3. Test for 1.4 K - 1.6 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the black phone button. If not within the specified range, replace the inside rearview mirror.
  4. Test for 2.7 K - 3.3 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the blue On-Star® button. If not within the specified range, replace the inside rearview mirror.
  5. Test for 12.5 K - 13.5 K ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the red emergency button. If not within the specified range, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Inside Rearview Mirror Replacement (DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system) or «Inside Rearview Mirror Replacement (Except DD8)»(/chevrolet/corvette/c6-2004-2014/remont/mirrors/#mirror-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

OnStar Steering Wheel Control Functions Manfunction

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 (OPC) feature is in use. If the "Talk" or "Mute" button (depending upon the vehicle) on the steering wheel controls is depressed during an OPC call, the communication interface module (CIM) receives the message on the serial data bus from either the radio or body control module (BCM). This message is interpreted as a request to turn any spoken numbers into dual tone multi-frequency (DTMF) 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 Inoperative , to begin diagnosis of the steering wheel control concern.

  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

AM and FM radio reception is dependent on the following components

  1. Radio antennas - left and right - in the rear compartment
  2. Coax cables between the radio antennas and the radio antenna modules
  3. Radio antenna modules - left and right
  4. Coax cables between the radio antenna modules and the radio
  5. Radio

Diversity Antenna System

This diversity antenna system is comprised of 3 antennas, 2 radio antenna modules, a coax, and an FM composite signal from the radio to the left antenna module. In AM and WX mode the system functions as follows: The left antenna module takes the signal from the AM antenna. The left antenna module amplifies this signal and sends it to the radio. In FM mode the system functions as follows: In this mode the radio supplies 5-8 V over the FM composite signal wire and this switches the modules into FM mode. The left antenna module sends 5-8 V to power the right antenna module via coax. The right antenna module takes signal from the FM2 antenna and sends it to the left antenna module where it is mixed with the signal from the FM1 antenna. The left antenna module combines and amplifies both signals and sends the combined signal to the radio. The FM composite signal also provides a feedback signal to the left antenna module, which indicates the quality of the signal.

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.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Radio ON, tune to several known FM, AM, and XM (if equipped) stations, and play a known good CD.

  1. If audio output is poor from all sources, refer to «Speaker Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  2. If both AM and FM reception is poor, refer to «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  1. Inspect the radio antennas for damage and proper mounting. If damage is found, repair or replace as necessary.
  2. Inspect each radio antenna module grounding surface and the mounting hardware for any corrosion that may cause a poor ground. If corrosion is noted, clean the grounding surfaces and hardware.
  3. Ignition OFF, disconnect the X2 harness connector at the left radio antenna module. Test for infinite resistance between the terminals listed below and ground. Left Antenna Signal - AM - terminal 1 Left Antenna Signal - FM - terminal 2 If less than specified value, replace the appropriate antenna.
  4. Ignition OFF, disconnect the X1 harness connector at the right radio antenna module. Test for infinite resistance between the Right Antenna Signal - FM2 - terminal 1 and ground. If less than specified value, replace the antenna.
  5. Reconnect the X2 harness connector at the left antenna module and the X1 harness connector at the right antenna module.
  6. Ignition OFF, disconnect the X1 harness connector at the left radio antenna module.
  7. Radio ON, test for 10 - 12 V between the Antenna Enable signal circuit terminal 1 and ground. If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  8. Radio tuned to FM, test for 4.5 - 8.5 V on the FM composite signal circuit terminal 2. If less than specified range, test the signal circuit for a short to ground. 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.
  9. Ignition OFF, connect the harness connector at the left antenna module.
  10. Disconnect the coax cable from the right antenna module.
  11. Ignition ON, radio tuned to FM, test for 4.5 - 8.5 V between the center terminal and the outer shield. If less than specified range, test the coax for a short to ground. If the circuit tests normal, replace the left antenna module. If greater than the specified range, test the coax for a short to voltage. If the circuit tests normal, replace the left antenna module.
  12. Ignition OFF, disconnect the coax cables at the radio and radio antenna modules.
  13. Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax.
  14. Test for less than 5ohms on the antenna coax center terminal from end to end. If greater than the specified range, replace the antenna coax.
  15. Test for less than 5ohms on the antenna coax outer shield from end to end. If greater than the specified range, replace the antenna coax.
  16. Test for infinite resistance between the coax center terminal and the outer shield. If less than the specified value, replace the antenna coax.
  17. Replace the left antenna module. Radio ON, verify the radio reception has improved. If there is still poor reception, replace the right antenna module. If there is still poor reception, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Radio Antenna Module Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Radio Antenna Module Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Radio replacement, setup, and programming

Speaker Replacement Reference

ComponentRepair Instruction
Speaker Replacement - Front DoorRefer to Radio Front Side Door Speaker Replacement
Speaker Replacement - FrontRefer to Radio Front Speaker Replacement
Speaker Replacement - Rear ConvertibleRefer to Radio Rear Speaker Replacement (Convertible) or Radio Rear Speaker Replacement (Coupe)
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.
CircuitShort to GroundOpen/High ResistanceShort to VoltageSignal Performance
Audio Amplifier B+2, 32, 3
Antenna Enable Signal2, 32, 32, 3
Amplifier Mute Signal222
Low level audio (+)B1025*1*B1025*
Low level audio (-)B1025*1*B1025*
Speaker Output (+)1*1*1*
Speaker Output (-)1*1*1*
Audio Amplifier Ground2, 3
1. No or reduced sound from speaker. 2. Amplifier inoperative/no sound from speaker 3. Powered subwoofer inoperative * Noticeable audio distortion possible

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5V 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. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3V AC and slightly higher.

  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.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

  1. If audio is inoperative from all speakers, refer to «Amplifier Circuit Malfunction U65»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__amplifier-circuit-malfunction-u65) .
  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 - Radio Output Testing - U65»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-circuit-malfunction-radio-output) .
  3. If the audio/bass is inoperative from one of the front door powered subwoofers, refer to «Powered Subwoofer Circuit Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__powered-subwoofer-circuit-malfunction) .

Amplifier Circuit Malfunction U65

  1. Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
  2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal A and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the B+ circuit terminal H and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  5. Radio ON, test for 0.6-1.0 V between the amplifier mute signal circuit terminal B1 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.
  6. Radio ON, test for B+ between the antenna enable signal circuit terminal B11 and ground. If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  7. If all circuits test normal, replace the audio amplifier.

Amplifier Circuit Malfunction U66

  1. Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
  2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal F and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the B+ circuit terminal E and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  5. Radio ON, test for 0.6-1.0 V between the amplifier mute signal circuit terminal A8 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.
  6. Radio ON, test for B+ between the antenna enable signal circuit terminal A3 and ground. If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  7. If all circuits test normal, replace the audio amplifier.

Speaker Circuit Malfunction - Radio Output Testing - U65

  1. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0-7.5 V between the appropriate signal circuit terminal listed below and ground. Left front low level audio signal (+) terminal B10 Left front low level audio signal (-) terminal B9 Right front low level audio signal (+) terminal B8 Right front low level audio signal (-) terminal B7 Left rear low level audio signal (+) terminal B6 Left rear low level audio signal (-) terminal B5 Right rear low level audio signal (+) terminal B4 Right rear low level audio signal (-) terminal B3 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. If all circuits test normal, replace the amplifier.

Speaker Circuit Malfunction - Radio Output Testing - U66

  1. Ignition OFF, disconnect the X2 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0-7.5 V between the appropriate signal circuit terminal listed below and ground. Left front low level audio signal (+) terminal A7 Left front low level audio signal (-) terminal A6 Right front low level audio signal (+) terminal B6 Right front low level audio signal (-) terminal B7 Left rear low level audio signal (+) terminal A4 Left rear low level audio signal (-) terminal A5 Right rear low level audio signal (+) terminal B5 Right rear low level audio signal (-) terminal B4 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. If all circuits test normal, replace the amplifier.

Speaker Circuit Malfunction - Amplifier Output Testing - U65

  1. Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
  2. Radio ON, test for less than 1 V between the appropriate signal circuit terminal listed below and ground: Left front midrange speaker output (+) - terminal A9 X2 Left front midrange speaker output (-) - terminal A10 X2 Right front midrange speaker output (+) - terminal A11 X2 Right front midrange speaker output (-) - terminal A12 X2 Rear speaker output (+) - terminal A7 X2 Rear speaker output (-) - terminal A8 X2 Front center speaker output (+) - terminal A5 X2 Front center speaker output (-) - terminal A6 X2 Left front subwoofer speaker output (+) - terminal B X1 Left front subwoofer speaker output (-) - terminal G X1 Right front subwoofer speaker output (+) - terminal C X1 Right front subwoofer speaker output (-) - terminal F X1 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
  3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground: Left front midrange speaker output (+) - terminal A9 X2 Left front midrange speaker output (-) - terminal A10 X2 Right front midrange speaker output (+) - terminal A11 X2 Right front midrange speaker output (-) - terminal A12 X2 Rear speaker output (+) - terminal A7 X2 Rear speaker output (-) - terminal A8 X2 Front center speaker output (+) - terminal A5 X2 Front center speaker output (-) - terminal A6 X2 Left front subwoofer speaker output (+) - terminal B X1 Left front subwoofer speaker output (-) - terminal G X1 Right front subwoofer speaker output (+) - terminal C X1 Right front subwoofer speaker output (-) - terminal F X1 If less than the specified value, test both circuits of the affected speaker for a short to ground.
  4. If all circuits test normal, reconnect all harness connectors at the amplifier.
  5. Radio ON, disconnect the appropriate speaker.
  6. Test for 5.0-7.5 V between the signal circuit terminal A and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio. 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.
  7. Test for 5.0-7.5 V between the signal circuit terminal B and ground. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio. 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.
  8. If all circuits test normal, replace the speaker.

Powered Subwoofer Circuit Malfunction

  1. Disconnect the harness connector at the inoperative subwoofer.
  2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 4 and ground If greater than specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between circuit terminal 5 and ground. If less then the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Radio ON, test for B+ between the antenna enable signal circuit terminal 3 and ground. If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  5. Radio ON, test for 5.0-7.5 V between the signal circuit 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 audio amplifier. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
  6. Test for 5.0-7.5 V between the signal circuit terminal 1 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 audio amplifier. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
  7. If all circuits test normal, replace the appropriate subwoofer.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Speaker Replacement Reference»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Audio Amplifier and Radio replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The communication interface module (CIM) 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 CIM 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 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

  1. Verify that the cellular antenna and cellular antenna coupling assembly are not damaged. If damage is found, repair or replace as necessary.
  2. Ignition ON, press the OnStar® Call Center button. Verify the system activates and the message Connecting to OnStar® is heard. If the system does not activate and the message is not heard, refer to «OnStar Button Malfunction»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  3. If the system activates but does not connect with the OnStar® call center, refer to Circuit/System testing «Circuit/System Testing»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
  2. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground. If greater than the specified range, replace the antenna coax.
  3. Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground. If greater than the specified range, replace the antenna coax.
  4. Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax
  5. Test for infinite resistance between the antenna coax outer shield and ground. If less than the specified value, replace the antenna coax
  6. Test for less than 5 ohms at the cellular antenna coax center terminal from end to end. If greater than specified value, replace the cellular antenna coax cable.
  7. Test for less than 5 ohms at the cellular antenna coax outer shield from end to end. If greater than specified value, replace the cellular antenna coax cable.
  8. Test for infinite resistance between the antenna coax center terminal and the outer shield. If less than specified value, replace the cellular antenna coax cable.
  9. If coax cable tests normal, replace the cellular antenna.
  10. Press the OnStar® Call Center button. Verify the system connects to the OnStar® call center. If a connection is not made to the OnStar® call center, replace the CIM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «Cellular and Navigation Antenna Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
  2. «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming
  1. Perform the «Diagnostic System Check - Vehicle»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
  2. Review «Strategy Based Diagnosis»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
  3. «Diagnostic Procedure Instructions»(/chevrolet/corvette/c6-2004-2014/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The CIM is capable of interpreting voice commands received over the cellular microphone circuits. 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»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__circuit-testing)
  2. «Connector Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__connector-repairs)
  3. «Testing for Intermittent Conditions and Poor Connections»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis)
  4. «Wiring Repairs»(/chevrolet/corvette/c6-2004-2014/remont/body-electrical/#wiring-systems-and-power-management-service-troubleshooting-diagnosis__wiring-repairs)
IMPORTANTIt 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 OnStar® Call button. Verify that your voice is heard clearly by the OnStar® Call Center. If your voice can not be heard clearly, refer to «OnStar Microphone Malfuncation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
  2. Press the OnStar® Call answer button. Attempt to operate the OnStar® system using multiple different voice commands. Verify the system responds appropriately to all voice commands. If the OnStar® system does not respond to any voice commands, replace the CIM.
  3. If the system is operational, but does not respond appropriately to certain commands refer to «OnStar Description and Operation»(/chevrolet/corvette/c6-2004-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation) for tips on proper pronunciation.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for VCIM replacement, setup, and programming

Scheme 12

Scheme 12: Mobile Telephone Microphone Replacement
Scheme 12: Mobile Telephone Microphone Replacement
CalloutComponent Name
Preliminary Procedure: Remove the driver side windshield garnish molding. Refer to Windshield Side Garnish Molding Replacement .
1Mobile Telephone Microphone Bezel Procedure: Use flat blade tool to pry bezel from molding.
2Mobile Telephone Microphone Assembly Procedure: Unsnap microphone from bezel.

Scheme 13

Scheme 13: Communication Interface Module Replacement
Scheme 13: Communication Interface Module Replacement
CalloutComponent Name
Preliminary Procedure: Remove the communication Interface Module Bracket. Refer to Communication Interface Module Bracket Replacement .
1Communication Interface Module Procedure Disconnect the electrical connections. Unsnap Module from integral tabs on Bracket. If replacing the communication interface module be sure to transfer Bluetooth antenna, if equipped. For programming and set up procedures, refer to Control Module References .

Scheme 14

Scheme 14: Wireless Communication Interface Antenna Replacement
Scheme 14: Wireless Communication Interface Antenna Replacement
CalloutComponent Name
Preliminary Procedure: Remove the communication interface module. Refer to Communication Interface Module Replacement
1Wireless Communication Interface Antenna Bluetooth Module Procedure: Unsnap the Antenna from Communication Module.

Scheme 15

Scheme 15: Communication Interface Module Bracket Replacement
Scheme 15: Communication Interface Module Bracket Replacement
CalloutComponent Name
Preliminary Procedure: Remove the instrument panel insulator right panel. Refer to Instrument Panel Insulator Panel Replacement .
1Communication Interface Module Nut (Qty: 1) CAUTION: Refer to Fastener Caution . Tighten: 3 N.m (27 lb in)
2Communication Interface Module Bolt Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 3 N.m (27 lb in)
3Communication Interface Module Bracket Procedure Disconnect the electrical connections. If replacing the communication interface module be sure to transfer Bluetooth antenna, if equipped. For programming and set up procedures, refer to Control Module References .
CAUTION
Refer to Fastener Caution .
CAUTION
Refer to Fastener Caution .

Care of CDs

Handle CDs carefully. Store them in their original cases or other protective cases and away from direct sunlight and dust. The CD player scans the bottom surface of the disc. If the surface of a CD is damaged, such as cracked, broken, scratched, or wrinkled labeling, the CD will not play properly or not at all. If the surface of a CD is soiled, take a soft, lint free cloth or dampen a clean, soft cloth in a mild, neutral detergent solution mixed with water, and clean it. Make sure the wiping process starts from the center to the edge. Do not touch the bottom side of a CD while handling it. This could damage the surface. Pick up CDs by grasping the outer edges or the edge of the hole and the outer edge.

Care of the CD Player

The use of CD lens cleaners for CD players is not advised, due to the risk of contaminating the internal lens of the CD optics with lubricants.

Stuck CDs

Interrupting the battery power by pulling the fuse will sometimes release a stuck CD. If a CD is stuck, and removed, inspect it for warps, cracks, etc. If the CD is damaged, do not replace the radio.

Labeling CDs

Paper labels can eventually warp and wrinkle, and this will cause the disc to jam inside the CD player. Try labeling the top of the discs with a soft magic marker instead.

Removal Procedure

  1. Remove the cover from the instrument panel (I/P) electrical center.
  2. Remove the RDO/CD MiniFuse® #5 from the I/P electrical center.
  3. Remove the I/P accessory trim plate. Refer to «Instrument Panel Accessory Trim Plate Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  4. Remove the HVAC control module. Refer to «HVAC Control Module Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
  5. Remove the screws retaining the radio control to the I/P center support bracket.
  6. Begin to remove the radio control from the center support bracket enough to access the connectors at rear of the radio control.
  7. Disconnect the electrical/audio and coaxial cable connectors from the radio control.
  8. Remove the radio control.

Installation Procedure

  1. Connect the electrical/audio and coaxial cable connectors to the radio control.
  2. Install the radio control into position in the I/P center support bracket. Align the radio control locator tab into the center support bracket locator hole.
  3. Install the radio control retaining screws. Tighten: Tighten the screws to 2.5 N.m (22 lb in).
  4. Install the HVAC control module. Refer to «HVAC Control Module Replacement»(/chevrolet/corvette/c6-2004-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
  5. Install the I/P accessory trim plate. Refer to «Instrument Panel Accessory Trim Plate Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  6. Install the RDO/CD MiniFuse® #5 to the I/P electrical center.
  7. Install the cover to the I/P electrical center.
  8. Refer to «Control Module References»(/chevrolet/corvette/c6-2004-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for programming and setup information.

Scheme 16

Scheme 16: Digital Radio Receiver Replacement (Coupe)
Scheme 16: Digital Radio Receiver Replacement (Coupe)
CalloutComponent Name
Preliminary Procedure: Remove the rear compartment trim panel. Refer to Rear Compartment Rear Center Trim Panel Carpet Replacement .
1Digital Radio Receiver Refer to Control Module References for programming and setup information. Tip: Disconnect the electrical connectors.
2Digital Radio Receiver Bracket

Scheme 17

Scheme 17: Digital Radio Receiver Replacement (Convertible)
Scheme 17: Digital Radio Receiver Replacement (Convertible)
CalloutComponent Name
Preliminary Procedure: Remove the compartment lid extension. Refer to Folding Top Stowage Compartment Extension Outer Panel Replacement .
1Digital Radio Receiver Nut (Qty: 3) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Digital Radio Receiver Refer to Control Module References for programming and setup information. Tip: Disconnect the electrical connectors.
CAUTION
Refer to Fastener Caution .

Scheme 18

Scheme 18: Radio Volume Compensator Interior Noise Microphone Replacement
Scheme 18: Radio Volume Compensator Interior Noise Microphone Replacement
CalloutComponent Name
1Driver Knee Bolster Panel Assembly Refer to Driver Knee Bolster Panel Replacement .
2Radio Volume Microphone Screw (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
3Radio Volume Microphone Assembly
CAUTION
Refer to Fastener Caution .
  1. Fold the passenger side carpet back exposing the electrical center.
  2. Remove the 4 amplifier retaining screws from the electrical multi-use bracket.
  3. Remove the amplifier from the bracket.
  4. Disconnect the electrical leads to the amplifier.
  1. Position the amplifier to the electrical multi-use bracket and connect the electrical leads to the amplifier.
  2. Install the 4 amplifier retaining screws to the bracket. Tighten: Tighten the screws to 2.5 N.m (22 lb in).
  3. Install the carpet to cover the instrument panel (I/P) electrical center.

Navigation Display Module Replacement

The navigation display module is serviced as part of the radio. Refer to Radio Replacement .

  1. Remove the windshield upper garnish molding. Refer to «Windshield Upper Garnish Molding Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .
  2. Disengage the retaining clips from the windshield bracket by grasping the antenna assembly at the windshield and sliding the assembly towards the passenger side of the vehicle.
  3. Lower the antenna coaxial cable from the windshield header.
  4. Disconnect the coaxial leads from the antenna base, and remove the antenna from the vehicle.
  1. Position the antenna assembly to the windshield and connect the coaxial leads to the antenna.
  2. Route the antenna coaxial cable to the windshield header.
  3. Align the antenna assembly to the windshield bracket retaining clips. Push the assembly to the driver side of the vehicle to engage the retainers.
  4. Install the windshield upper garnish molding. Refer to «Windshield Upper Garnish Molding Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .

Scheme 19

Scheme 19: Radio Antenna Module Replacement (Convertible)
Scheme 19: Radio Antenna Module Replacement (Convertible)
CalloutComponent Name
Preliminary Procedure: Remove the rear compartment center trim panel. Refer to Rear Compartment Rear Center Trim Panel Carpet Replacement .
1Antenna Module Nut CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Antenna Module - Right
3Antenna Module Nut Tighten: 2 N.m (18 lb in)
4Antenna Module - Left
CAUTION
Refer to Fastener Caution .

Scheme 20

Scheme 20: Radio Antenna Module Replacement (Coupe)
Scheme 20: Radio Antenna Module Replacement (Coupe)
CalloutComponent Name
Preliminary Procedure: Remove the rear compartment center trim panel. Refer to Rear Compartment Rear Center Trim Panel Carpet Replacement .
1Antenna Module Nut CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
2Antenna Module - Right
3Antenna Module Nut Tighten: 2 N.m (18 lb in)
4Antenna Module - Left
CAUTION
Refer to Fastener Caution .

Digital Radio Antenna Replacement

The digital radio antenna assembly, located internal to the outside rearview mirror, cannot be serviced separately. Should the digital radio antenna assembly need to be replaced, the entire rearview mirror assembly will need to be replaced. Refer to Outside Rearview Mirror Replacement .

  1. Remove the instrument panel (I/P) Assembly. Refer to «Instrument Panel Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  2. Remove the 2 plastic rivet retainers (1) which secure the global positioning system (GPS) antenna to the HVAC duct.
  3. Remove the GPS antenna (2) from the vehicle.
  1. Position the GPS antenna (2) and the coaxial lead in the vehicle.
  2. Install 2 plastic rivets (1) securing the GPS antenna to the HVAC duct.
  3. Install the I/P assembly. Refer to «Instrument Panel Assembly Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .

Scheme 21

Scheme 21: Navigation Antenna Replacement
Scheme 21: Navigation Antenna Replacement
CalloutComponent Name
Preliminary Procedure: Remove the air distribution duct. Refer to Air Distributor Duct Replacement .
1Remove Navigational/Mobile Telephone Antenna Fasteners Tip: Use a flat-bladed tool to release center locking pin.
2Navigational/Mobile Telephone Antenna
  1. Remove the right front instrument panel (I/P) closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  2. Remove the right front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  3. Locate the plastic cover on the pillar to door pass-through. Pull it back and disconnect the digital antenna cable connector and cut it off on the body side of the harness.
  4. Loosen the left side door mechanical release lever and set it aside. Refer to «Door Inside Manual Release Actuator Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles) .
  5. Remove the left lock pillar trim. Refer to «Body Lock Pillar Trim Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .
  6. Remove the left front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  7. Remove the left front I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  8. Locate the plastic cover on the pillar to door pass-through. Pull it back and disconnect the digital antenna cable connector and cut it off on the body side of the harness.
  9. Remove the folding top storage compartment lid extension. Refer to «Folding Top Stowage Compartment Extension Outer Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/sun-rooft-topconvertible-top/#folding-top-system) .
  10. Disconnect digital antenna cable connectors from digital receiver and cut off on body side of harness.
  1. Move to center of the I/P area and route a piece of mechanic's wire behind the I/P center console area. Attach the right side of the new antenna cable to the mechanic's wire on the left side of the I/P with a piece of tape and pull the wire through the center I/P center console area to the right side of the I/P. Follow the approximate routing of the old antenna cable when placing mechanic's wire.
  2. Push the new connector through the plastic seal on the right side pillar to door pass-through, reconnect the connector, and reinstall the plastic seal. The seal should snap into place securely. Use tie straps as needed to secure the new antenna cable under the right side of I/P.
  3. Push the new connector through plastic seal on the left side pillar to door pass-through, reconnect the connector, and reinstall the plastic seal. The seal should snap into place securely. Use tie straps as needed to secure the new antenna cable under the left side of the I/P.
  4. Route the new cable alongside the old cable as closely as possible following left side of the vehicle to the digital receiver. Reconnect it to the receiver. Use tie straps as needed to secure the new cable.
  5. Install the right front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  6. Install the right I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  7. Install the left I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  8. Install the left lock pillar trim. Refer to «Body Lock Pillar Trim Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .
  9. Install the left front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  10. Install the left side door mechanical release lever. Refer to «Door Inside Manual Release Actuator Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles) .
  11. Install the folding top storage compartment extension. Refer to «Folding Top Stowage Compartment Extension Outer Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/sun-rooft-topconvertible-top/#folding-top-system) .
  1. Remove the right instrument panel (I/P) closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  2. Remove the right front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  3. Locate the plastic cover at the right pillar to door pass-through. Pull the seal back and disconnect the digital antenna cable connector and cut it off on the body side of the harness.
  4. Loosen the left side door mechanical release lever and set it aside. Refer to «Door Inside Manual Release Actuator Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles) .
  5. Remove the left front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  6. Remove the left I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  7. Locate the plastic cover at the left side of the I/P pillar to door pass-through. Pull it back and disconnect the digital antenna cable connector and cut it off on the body side of the harness.
  8. Remove the rear compartment carpet to reveal the digital radio receiver. Refer to «Rear Compartment Floor Panel Carpet Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) or «Rear Compartment Floor Panel Carpet Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  9. Disconnect the antenna cable connectors from the digital receiver and cut them off on the body side of the harness.
  1. Move to the center of the I/P area and route a piece of mechanic's wire behind the I/P/center console area. Attach the right side of the new antenna cable to the mechanic's wire on the left side of the I/P with a piece of tape and pull the wire through the center I/P center console area to the right side of the I/P. Follow the approximate routing of the old antenna cable when placing the mechanic's wire.
  2. Push the new connector at the right side of the I/P through the plastic seal at the right side pillar to door pass-through, reconnect the connector, and reinstall the plastic seal. The seal should snap into place securely. Use tie straps as needed to secure the new antenna cable under the right side of the I/P.
  3. Push the new connector at the left side of the I/P through the plastic seal at the left side pillar to door pass-through, reconnect the connector, and reinstall the plastic seal. The seal should snap into place securely. Use tie straps as needed to secure the new antenna cable under the left side of the I/P.
  4. Route the new cable alongside the old cable as closely as possible following left side of the vehicle to the digital receiver. Reconnect to the receiver. Use tie straps as needed to secure the new cable.
  5. Install the right front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  6. Install the right I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  7. Install the left I/P closeout panel. Refer to «Instrument Panel Insulator Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/gauges-instrument-panels/#instrument-panel-trim-and-console-trim) .
  8. Install the left lock pillar trim. Refer to «Body Lock Pillar Trim Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .
  9. Install the left front carpet retainer. Refer to «Carpet Retainer Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .
  10. Install the left side door mechanical release lever. Refer to «Door Inside Manual Release Actuator Replacement»(/chevrolet/corvette/c6-2004-2014/remont/door-locks-anti-theft-systems/#door-lock-system-door-handles) .
  11. Install the rear compartment carpet. Refer to «Rear Compartment Floor Panel Carpet Replacement (Convertible)»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) or «Rear Compartment Floor Panel Carpet Replacement (Coupe)»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#floor-coverings-and-headlinings) .

Scheme 22

Scheme 22: Radio Front Side Door Speaker Grille Replacement
Scheme 22: Radio Front Side Door Speaker Grille Replacement
CalloutComponent Name
Lower Speaker Grill
1Door Trim Panel Refer to Front Side Door Trim Panel Replacement - Left Side . Tip: Left Side Shown, Right Side Similar
3Lower Speaker Grill
Upper Speaker Grill
1Door Trim Panel Refer to Front Side Door Trim Panel Replacement - Left Side . Tip: Left Side Shown, Right Side Similar
4Switch Bezel Nut (Qty: 3). CAUTION: Refer to Fastener Caution . Tighten: 1 N.m (9 lb in)
5Switch Bezel
6Upper Speaker Grill
Speaker Emblem
2Speaker Emblem
CAUTION
Refer to Fastener Caution .

Scheme 23

Scheme 23: Radio Front Speaker Replacement
Scheme 23: Radio Front Speaker Replacement
CalloutComponent Name
1Defroster Grill Refer to Defroster Grille Replacement .
2Speaker Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
3Speaker Assembly
CAUTION
Refer to Fastener Caution .

Scheme 24

Scheme 24: Radio Front Side Door Speaker Replacement
Scheme 24: Radio Front Side Door Speaker Replacement
CalloutComponent Name
1Door Trim Panel Refer to Front Side Door Trim Panel Replacement - Left Side or Front Side Door Trim Panel Replacement - Right Side . Tip: Left side shown, right side similar.
2Door Speaker Screw (Qty: 4) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
3Door Lower Speaker
4Door Speaker Screw (Qty: 4) Tighten: 2 N.m (18 lb in)
5Door Upper Speaker
CAUTION
Refer to Fastener Caution .
  1. Position the foldable top in the down position.
  2. Position the tonneau cover in the up position.
  3. Grasp the speaker cover and firmly pull outward removing the speaker grill from the trim panel.
  4. Remove the screws (1) securing the speaker to the trim panel.
  5. Disconnect the electrical connector from the speaker.
  6. Remove the speaker (2) from the car.
  1. Connect the electrical connector to the speaker.
  2. Position the speaker (2) in the opening in the trim panel.
  3. Install the screws (1) securing the speaker to the trim panel. Tighten the screws. Tighten: Tighten the screws to 2 N.m (18 lb in).
  4. Position the tabs on the speaker grill to the slots in the trim panel.
  5. Push the speaker grill inward until fully seated against the trim panel.
  6. Return the tonneau cover and folding top to their original positions.
  1. Remove the rear compartment trim panel. Refer to «Rear Compartment Side Trim Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .
  2. Remove the screws (1) securing the speaker (2).
  3. Disconnect the electrical connector from the speaker.
  4. Remove the speaker from the car.
  1. Connect the electrical connector to the speaker (2).
  2. Position the speaker in the opening.
  3. Install the screws (1) securing the speaker. Tighten: Tighten the screws to 2 N.m (18 lb in).
  4. Install the rear compartment trim panel. Refer to «Rear Compartment Side Trim Panel Replacement»(/chevrolet/corvette/c6-2004-2014/remont/exteriorinterior-trim/#interior-trim-and-paneling) .

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. Auxiliary RCA Video Jacks (If Equipped)
  7. Voice Recognition
  8. Points of Interest
  9. Vehicle Information Communication System

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. Global positioning system (GPS) antenna)
  3. Auxiliary RCA video jacks (If Equipped)

Navigation Radio

This component acts as the operator interface for the navigation system, provides the data input from the operator to the navigation system and provides navigation information to the operator via the display screen. The navigation radio is located in the center of the instrument panel. The navigation radio provides the following

  1. A display screen-All navigation, audio and TV functions are displayed on this screen.
  2. Soft key buttons on the display to allow selection from menus and to operate the navigation system and the audio system.
  3. The DVD provides map data for navigation and map route guidance.
  4. The navigation system map with routing information displayed on the navigation radio screen.
  5. Provides verbal guidance to the operator.
  6. Connection to the global positioning system (GPS) antenna, which provides the vehicle position information.

Global Positioning System (GPS) Antenna

The global positioning system (GPS) antenna is located in the upper center of the I/P. The GPS antenna is powered through the same coaxial cable used to send the signals to the NAV radio. Interference to the system may occur if any of the following exist

  1. Signals are obstructed by objects such as, tall buildings or trees.
  2. Metallic objects located on the dashboard.
  3. Aftermarket glass tinting has been applied to the vehicles windshield.

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 as well as the vehicle speed signal to accurately display the current position of the vehicle. The map DVD must be in the NAV radio for route guidance.

Auxiliary RCA Video Jacks (If Equipped)

The auxiliary RCA video jacks are used to attach a remote video device. These connections may be used to provide audio and video input from a remote device such as a video game console or camera to the rear seat entertainment system.

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 (RAP) is active. This feature only works if the map DVD is inserted and the AGREE button has been pressed. For a complete list of available commands, refer to the Owners Manual Navigation Supplement and/or Personalization in the Owners manual.

Points of Interest

Points of interests (POI) 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 POI

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

VICS Module - Export

The vehicle information communication system (VICS) card, an export only dealer-installed option, is installed inside the navigation radio. The VICS card uses signals from the optical/microwave beacon antenna and the right radio antenna module to convey routing information to the NAV. The NAV either revises planned routing or relays the VICS information to the operator through the screen of the navigation radio and the voice guidance system.

OnStar Description and Operation

This OnStar® system consists of the following components

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

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

Communication Interface Module (CIM)

The communication interface module (CIM) 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 CIM through serial data messaging.

Dedicated circuits are used to connect the CIM to a microphone, the button assembly, and to command the status LED. The CIM 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, 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 CIM 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 CIM on the keypad signal circuit. Depending upon the voltage range returned the CIM 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 CIM 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 CIM will return an audible list of available commands.

OnStar® Microphone

The OnStar®, or cellular microphone, can be a part of the rearview mirror assembly, or on some vehicle lines, a separate, stand alone unit. In either case, the CIM supplies approximately 10 volts to the microphone on the cellular microphone signal circuit, and voice data from the user is sent back to the CIM over the same circuit. A cellular 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 (DRR) antenna, which also incorporates the functionality of the DRR satellite antenna (XM).
  4. A cellular, GPS, and DRR 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 CIM.

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 CIM. 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.

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's Bluetooth ® system, a Bluetooth ® equipped cellular phone is required.

The Bluetooth ® antenna is a small fixed antenna connected directly to the CIM 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 CIM. 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 Manual.

Back-up Battery (BUB) (If Equipped)

IMPORTANTDo not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Disconnecting power to the OnStar® module in any way while the ignition is ON or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB). This action is per design as the BUB is designed to provide power to the CIM 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 BUB is not rechargeable and once activated the BUB must be replaced.

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

The BUB 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 CIM 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 BUB is connected to the CIM 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 BUB battery positive voltage circuit is shorted to the BUB 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 CIM.

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 (RAP) mode has ended. This cycle enables the CIM 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 RAP 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 RAP enabled.

The sleep state is entered after the vehicle has been shut off and the RAP has timed out while in an analog cellular area. At a predetermined time recorded within the CIM, 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 RAP 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 CIM. 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.

OnStar® Personal Calling (OPC)

The hands free, OnStar® personal calling (OPC) cellular phone feature is an additional feature of the OnStar® system. This feature is embedded within the CIM; however it must be activated by an OnStar® advisor. OPC 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 OPC, 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 OPC feature, speaking the word "call," and repeating the nametag assigned.

Customers have the capability to lock their OPC 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 (DIC).

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's 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. OPC 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 (STID), electronic serial number (ESN) or manufacturers electronic ID (MEID), 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 communication interface module (CIM) utilizes 2 numbers for cellular device identification, call routing and connection, a mobile identification number (MIN) and a mobile directory number (MDN). The MIN represents the number used by the cellular carrier for call routing purposes while the MDN 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's 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. Some of those features may include the radio data system (RDS), an audio amplifier, programmable equalizer (EQ), and digital satellite radio (U2K).

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

  1. Radio Circuit Operation
  2. Antenna System
  3. AM/FM Reception
  4. Digital Radio Receiver
  5. Speaker Operation
  6. Audio Amplifier
  7. Radio Data System (RDS)
  8. Radio Data System (RDS) Messages
  9. MP3/CD Formatting Information for MP3/CD Radios (If equipped)
  10. Integral Multi Disc CD Changer (IMDX)
  11. Radio Error Messages
  12. Theft Deterrent
  13. Radio Personalization w/Home and Away Feature
  14. OnStar ®
  15. Steering Wheel Controls
  16. Auxiliary Input Jack
  17. Noise Compensation

Radio Power

The radio does not use a discrete ignition feed circuit for power moding. The power mode master (PMM) provides the system power mode to the radio via serial data messages. The PMM 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 Outputs

At minimum volume, the plus (+) and minus (-) speaker outputs are approximately half battery voltage, measured to vehicle ground. As the volume increases, the plus and minus change to create a voltage difference between each other either driving the voice coil of the speaker, or being fed to an amplifier.

Radio Head Dimming

Dimming and backlighting levels are determined by the serial data messages the radio receives.

Diversity Antenna

A Diversity Antenna System is designed to deliver the best radio signal reception possible. Two antennas are used to form a diversity system. The primary antenna receives both AM and FM signals. The second antenna receives only FM signals.

The Diversity Antenna System consists of 2 separate antennas, and 2 radio antenna modules. The antennas on this vehicle consist of 20 gage stranded wire. These wires are termed elements, and are routed in the body to capture signals.

The antenna reception signals are sorted out by the radio antenna module. The radio antenna module is enabled when the radio is turned on. When the AM or FM band is selected on the radio, the antenna module connects the rear window antenna directly to the radio. In addition, when the FM band is selected an enable signal is sent to the antenna module. Superimposed on this enable signal is the strength of the signal being received by the radio tuner. The antenna module now performs two functions. It switches between the front and rear antennas, monitoring the radio signal strength and combines both signals and phase aligns them to create one strong signal.

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)

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.

The radio communicates with the digital radio receiver (DRR) via serial data. During XM operation the audio signals are sent over the left and right audio signal circuits from the DRR to the radio.

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. When the speaker is at rest, such as when the volume at a minimum value, the voltage applied to each side of the speaker is 1/2 ignition system voltage. This way, the speaker cone can be moved in either direction.

Audio Amplifier (If equipped)

IMPORTANTWhile operating the power folding top, the amplifier will mute momentarily to adjust the equalization settings.

Amplifier Interface

A fused battery voltage circuit provides the main amplifier power. A switched 12-volt 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-volt input. This type of amplifier does not have serial data communication capability, and can not set DTCs.

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.

Radio Data System (RDS) (If equipped)

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

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.

RDS Messages

  1. ALERT!: Alert warns 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.
  2. INFO (Information): If the current station has a message, the information symbol or INFO displays. Press this button to see the message. The message can display the artist, song title, call in phone numbers, etc. If the entire message can not be displayed, parts of the message appear every three seconds. To scroll through the message, press and release the INFO button. A new group of words displays after every press of this button. Once the complete message has displayed, the information symbol or INFO disappears from the display until another new message is received. The last message is displayed by pressing the INFO button. View the last message until a new message is received or you tune to a different station.

MP3/CD Formatting Information for MP3/CD Radios

The MP3/CD equipped radios will play standard audio CDs, CD-Rs, and CD-RWs. The CD-R/RWs may contain either standard audio (*.cda) or compressed audio (*.mp3). Customers who record their own music CDs should be aware of the following

  1. The files can be recorded on a CD-R/RW disc with a maximum capacity of 700 MB.
  2. The radio will play only compressed audio files recorded in the *.mp3 format. It also supports playlists that can be made and saved with popular MP3 software (in the *.m3u format). A playlist name must be no more than 32 characters in length. If the name of a playlist is longer than 32 characters, the radio will ignore the playlist.
  3. The radio will only play audio from a CD-R/RW, it cannot record audio.
  4. The radio will play a mixed mode CD-R/RW (one recorded with both *.cda and *.mp3 files). If a mixed mode CD is inserted in the radio, the radio will assign the standard CD audio to a directory which is listed as ROM audio directory.
  5. ID3 tag information is displayed by the radio, if available. The ID3 tag information can either be version 1 or 2. The radio will display the filename, song name, artist name, album name, directory name, and playlist name, etc.
  6. The radio supports multi-session discs, but only the files from the last session will be played.
  7. There are a total of 20 directories (folders) allowed on a disc. The file structure can be 0-4 directories deep (a folder within a folder, within a folder, etc.) Anything more than 20 directories will be ignored. Each directory may have up to 99 files contained within it. Files not having the *.mp3 extension will not be played, but still count toward the maximum. Anything more than the first 99 files within a directory will be ignored. A single disc may have up to 254 files and directories. Anything beyond the 254 limit will be ignored.
  8. MP3 files must be written to a CD-R/RW in one of the following industry-standard formats: ISO 9660 Level 1 ISO 9660 Level 2 Joliet Romeo

If the customer does not follow these guidelines when recording a CD-R/RW, the disc may not play in the MP3 Radio.

Integral Multi Disc CD Changer (IMDX) (If equipped)

The integral multi disc CD changer has the capability of storing and playing up to six (6) compact discs. The integral multi disc CD changer has a shock-absorbing system. Only under extreme operating temperatures or severe shock or vibration should the compact disc player skip or mute. If the customer travels an abnormally rough road, a skip condition may be normal. Test drive the vehicle on a normal road with a known good CD. If the condition is still present, replace the radio. The use of CD lens cleaner discs is not advised, due to the risk of contaminating the lens of the CD optics with lubricants internal to the CD mechanism.

The CD mechanism within the ICDX radio will begin an initialization routine after a battery connect (e.g., connecting radio connector X1). The initialization process takes approximately 25 seconds to complete. It is very critical that the initialization is completed before removing battery power from the radio, in order for the complex moving parts of the CD mechanism to be positioned properly before shipping and/or handling purposes. Damage may result to the moving parts of the CD mechanism if battery power is removed during the initialization routine. The damage occurs to the CD mechanism during subsequent shipping or handling operations. The extent of the damage causes the CD mechanism not to recover and the mechanism becomes inoperative.

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. A VIN sequence is the last 6 digits of the VIN. 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--A radio has received a VIN sequence. The radio only learns the VIN sequence if the VIN sequence contained all 6 digits. In this mode the radio has full functionality.
  2. No VIN Mode--A radio that has not received or learned a VIN. In this mode the radio has limited functionality.
  3. Theft Detected Mode--A radio that had previously learned a VIN sequence and subsequently received a VIN sequence not matching the learned sequence. In this mode the radio has limited functionality.

Radio Personalization w/Home and Away Feature (If Equipped)

If the vehicle has this feature, the radio can recall the latest audio system settings as adjusted the last time the vehicle was operated. This feature allows two different drivers to store and recall their own audio system settings. The settings recalled by the audio system are determined by which remote keyless entry transmitter (1 or 2) was used to enter the vehicle. The number on the back of the remote keyless entry transmitter corresponds to driver 1 or to driver 2. The audio system settings automatically adjust to where they were last set by the identified driver.

Radio Error Messages

The Radio may display the following Error Messages (Not all messages may be applicable)

  1. ERR: This message is displayed when the radio is unable to play the inserted cassette or CD
  2. LOC: This message is displayed when the radio has entered Theft mode.
  3. CAL/CAL ERR: This message is displayed when the radio has detected an invalid calibration.
  4. CDX ERR: Displays if communication is lost with the remote CD changer.
  5. CHECK CD: Displays when the player encounters a focus or tracking error.
  6. CHK CDXX: Displays when the CD changer encounters a focus or tracking error.
  7. CHK TAPE: Displays if a tape has been inserted but is unable to be played due to an error.
  8. DOOR OPEN: Displays when the CD changer door has been left open.
  9. NO DISC: Displays when the radio expected a disc to be inserted.
  10. NONE: Displays when the radio is unable to detect the vehicle speed data information via the serial data circuit.

If an error message is displayed, perform the appropriate diagnostics.

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 .

Using the Auxiliary Input Jack (if equipped)

The radio system may have a 3.5 mm auxiliary input jack located on the faceplate. An external audio device such as an MP3 player, CD player, laptop computer, cassette tape player, etc. can be connected to the auxiliary input jack for use as another source for audio listening. This is not an audio output; do not plug a headphone set into the front auxiliary input jack.

To use a portable audio player, connect a 3.5 mm (1/8 inch) cable to the radio's front auxiliary input jack. While a device is connected, press the radio CD/AUX button to begin playing audio from the device over the vehicle speakers. If there is a CD in the player, pressing the button once will play the CD, pressing again will switch it to the AUX feature.

Noise Compensation (If equipped)

A microphone mounted in the vehicle passenger compartment monitors background noise (such as wind noise from a window being opened) and digitally modifies the system's volume and equalization to ensure optimal sound and performance.

For convertibles, the radio receives a serial data message for top up or down and the radio adjusts the audio output level accordingly.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Lifting and Jacking the Vehicle
• Speedometer and/or Odometer Inaccurate or Inoperative
• Diagnostic Repair Verification
• Inside Rearview Mirror Replacement (DD8)
• Checking Aftermarket Accessories
• Steering Wheel Controls Inoperative
• Windshield Side Garnish Molding Replacement
• Instrument Panel Insulator Panel Replacement
• Fastener Caution
• HVAC Control Module Replacement
• Rear Compartment Rear Center Trim Panel Carpet Replacement
• Folding Top Stowage Compartment Extension Outer Panel Replacement
• Air Distributor Duct Replacement
• Door Inside Manual Release Actuator Replacement
• RPO Code List
• Steering Wheel Controls Description and Operation
• DTC B0001
• Navigation System Description and Operation
• Radio/Audio System Description and Operation
• Speaker Replacement Reference
• Digital Radio Antenna Replacement
• OnStar Description and Operation
• OnStar Steering Wheel Control Functions Manfunction
• Digital Radio Antenna Circuit Malfunction
• Digital Radio Output Circuit Malfunction
• Amplifier Circuit Malfunction U65
• Speaker Circuit Malfunction - Radio Output Testing - U65
• Powered Subwoofer Circuit Malfunction