Cellular System, Entertainment System and Navigation System Cadillac CTS II

Connector End View Reference

Description and Operation

Radio, Video, Audio Disc Player, and Navigation Information Display Replacement

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B0997 is not set.

If the DTC is set, replace the navigation display assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The navigation radio communicates with the radio control assembly via serial data. If the radio receives an improper status response message, DTC B1020 will set.

This DTC indicates an internal ECU fault or a stuck button on the faceplate. No external circuits are involved.

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

The radio receives an improper status response indicating an internal ECU fault or a stuck button on the radio control assembly.

No action is taken.

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

Schematic Reference

Connector End View Reference

Description and Operation

Radio Control Assembly Replacement (with Navigation Display) or Radio Control Assembly Replacement (without Navigation Display)

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC B1020 is not set.

If the DTC is set, replace the radio control assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The internal module circuitry temperature is monitored. If the an over-heat condition which exceeds the maximum threshold of the internal circuitry or a malfunctioning temperature sensor is detected, the module will shut down until the internal circuitry cools.

The radio is in the ON or ACCY position
The system voltage is at least 9 volts and no more than 16 volts.

The module detects an over-heat condition or a malfunctioning sensor.

Module functionality is suspended.

A current DTC clears when the module temperature returns to an acceptable level.
A history DTC clears after 100 malfunction-free ignition cycles.

Extended use of extremely high volume, especially in warm weather conditions, may cause this DTC to set in the audio amplifier. Under these conditions, it may be normal for this DTC to set to prevent permanent damage to the amplifier circuitry and no repair should be attempted.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Verify that DTC B1024 is not set.

If the DTC is set, replace the appropriate control module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for audio amplifier or antenna module replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Amplifier B+		2
Speaker Output Circuit (+)	B1XXX 02,*	B1XXX 04,*	B1XXX 01,*
Speaker Output Circuit (-)	B1XXX 02,*	B1XXX 04,*	B1XXX 01,*
Subwoofer Signal (+)	B1075 02,**	1	B1075 01,**
Subwoofer Signal (-)	B1075 02,**	1	B1075 01,**
Amplifier Control	B1287 02	B1287 04	B1287 01
Amplifier Ground		2
1. No or reduced sound from subwoofer 2. Amplifier inoperative/no sound from speaker * Sets associated speaker DTC with appropriate symptom type - see DTC descriptors ** Noticeable audio distortion possible

Each of the audio output channel circuits (+) and (-) have a varying AC mV signal that is produced by the radio and sent to the amplifier. The amplifier then processes these signals and passes the audio along with a DC bias voltage to the appropriate speakers. The audio being played on the system is produced by the varying AC voltage. 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. When using a DMM, each of the audio amplifier output channel circuits will measure approximately 6.5V DC.

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

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

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

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

The amplifier disables the audio output to the speaker with the current fault.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Radio ON, adjust the fade and balance controls on the radio to test all channels individually. Each channel should produce clear and even sound.

Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground: Left front tweeter speaker output (+) - terminal 4 X2 Left front tweeter speaker output (-) - terminal 5 X2 Right front tweeter speaker output (+) - terminal 7 X2 Right front tweeter speaker output (-) - terminal 6 X2 Left rear speaker output (+) - terminal 16 X2 Left rear speaker output (-) - terminal 8 X2 Right rear speaker output (+) - terminal 15 X2 Right rear speaker output (-) - terminal 14 X2 Front center speaker output (+) - terminal 13 X2 Front center speaker output (-) - terminal 12 X2 Left rear subwoofer speaker output (+) - terminal 5 X1 Left rear subwoofer speaker output (-) - terminal 6 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left front speaker output (+) - terminal 1 X1 Left front speaker output (-) - terminal 2 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left rear midrange speaker output (+) - terminal 11 X2 Left rear midrange speaker output (-) - terminal 10 X2 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
Radio ON, test for greater than 1 ohm between the appropriate signal circuit terminal listed below and ground: Left front tweeter speaker output (+) - terminal 4 X2 Left front tweeter speaker output (-) - terminal 5 X2 Right front tweeter speaker output (+) - terminal 7 X2 Right front tweeter speaker output (-) - terminal 6 X2 Left rear speaker output (+) - terminal 16 X2 Left rear speaker output (-) - terminal 8 X2 Right rear speaker output (+) - terminal 15 X2 Right rear speaker output (-) - terminal 14 X2 Front center speaker output (+) - terminal 13 X2 Front center speaker output (-) - terminal 12 X2 Left rear subwoofer speaker output (+) - terminal 5 X1 Left rear subwoofer speaker output (-) - terminal 6 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left front speaker output (+) - terminal 1 X1 Left front speaker output (-) - terminal 2 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left rear midrange speaker output (+) - terminal 11 X2 Left rear midrange speaker output (-) - terminal 10 X2 If less than the specified range, test both circuits of the affected speaker for a short to ground.
If all circuits test normal, reconnect all harness connectors at the amplifier.
Ignition ON, radio ON, disconnect the appropriate speaker.
Test for 5.0-7.5 volts between the signal circuit terminals and ground. If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.
If the circuit tests normal, test or replace the appropriate speaker.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Speaker Replacement Reference»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for amplifier replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

This DTC is run every 300 milliseconds.

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

The radio displays No XM Signal or Check Antenna.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Special Tools

EL-48028 Digital Radio Test Antenna. See Special Tools .

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.

Ignition OFF, disconnect the disconnect the digital radio antenna coax from the radio. Connect the EL-48028 to the radio and place on the roof of the vehicle. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) .
Ignition ON, radio tuned to XM channel 1. Verify DTC B125C is not set as current and XM reception is improved. If DTC B125C is set as current or the reception is not improved, replace the radio.
Ignition OFF, reconnect the antenna coax cable at the radio. Disconnect the antenna coax cable from the digital radio antenna.
Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and an outer shield. If less than the specified range, test the antenna coax cable for an open/high resistance. If greater than the specified range, test the antenna coax cable for a short to voltage.
If all circuits test normal, replace the digital radio antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Digital Radio, Mobile Telephone, and Vehicle Location Base Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the navigation radio is on, a discrete 12-volt signal is supplied on the Entertainment Remote Enable Signal circuit to the Display Module, Display Actuator, Antenna module, and Amplifier (UQA). This signal is used to control the power state of the modules.

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

The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.

The navigation radio detects a short to ground on the Entertainment Remote Enable Signal circuit.
All the above conditions are present for greater than 250 mS.

The Display Module, Display Module Actuator, Antenna module, and Audio Amplifier (UQA) may become inoperative.

The condition for setting the DTC no longer exists.
A history DTC clears after 50 malfunction-free ignition cycles.

This DTC may be stored as a history DTC without affecting the operation of the navigation radio.
If stored only as a history DTC and not retrieved as a current DTC, do not replace the navigation radio.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. The ignition circuit controls multiple modules/components. Each of the modules will need to be disconnected if the ignition circuit test fails for a short to voltage or short to ground. Disconnect one module/component at a time while testing the ignition circuit for a short to voltage or short to ground. If the fault is no longer present when disconnecting a module/component replace that module/component. If the fault is still present with all the module/component disconnected repair the circuit.

Ignition OFF, disconnect one of the connectors listed below at an inoperative module/component: Antenna Module Radio/HVAC Display X1 Radio/HVAC Display X2 Audio Amplifier X3 (UQA only)
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal listed below and ground. Antenna Module - terminal 1 Radio/HVAC Display X1 - terminal 4 Radio/HVAC Display X2 - terminal 3 Audio Amplifier (UQA only) - terminal 8 If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the Radio.
If all circuits test normal, replace the module/component that was disconnected in step 1.

Perform the Diagnostic Repair Verification after completing the repair.

«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio and amplifier replacement, programming, and Setup
«Radio Antenna Module Replacement (Sedan)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Radio Antenna Module Replacement (Wagon)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) for radio antenna module replacement
«Radio, Video, Audio Disc Player, and Navigation Information Display Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) for navigation display replacement

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Preform the appropriate radio programming or setup as directed in Control Module References .

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.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

A remote 3.5 mm auxiliary stereo jack allows playback of audio signals from remote devices (e.g., laptop computer, IPOD, MP3 player, etc.). When a remote devices audio mini-plug is inserted in the remote auxiliary jack, an internal mechanical switch closes completing the aux jack detect circuit to the radio. The radio automatically detects the input through the circuit and the device begins playing. The radio receives the devices audio signals on the auxiliary input 1 (left) signal circuit and auxiliary input 2 (right) signal circuit.

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

The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.

The radio detects a short to battery on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
The radio detects a short to ground on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
All the above conditions are present for greater than 250 mS.

No audio is heard from the remote audio device.

The conditions for setting the DTC are no longer present on the auxiliary input signal circuits.
A history DTC clears after 50 malfunction-free ignition cycles.

This DTC may be stored as a history DTC without affecting the operation of the module.
If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the auxiliary audio jack harness connector.
Ignition ON, test for less than 1 volt between the left axuiliary audio signal terminal 6, to ground. If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
Test for less than 1 volt between the right axuiliary audio signal terminal 7, to ground. If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
Test for less than 1 volt between the axuiliary audio common signal terminal 5, to ground. If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
Ignition OFF, test for infinite resistance from the left axuiliary audio signal terminal 6, to ground. If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the radio.
Test for infinite resistance from the right axuiliary audio signal terminal 7, to ground. If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the radio.
If all of the circuits test normal, replace the auxiliary audio jack.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When a OnStar® key press is made, a serial data message is sent to the audio system to mute all radio functions and transmit OnStar® originated audio. After the audio is muted, the OnStar® signals are transmitted to the audio system on the mono audio signal out circuit, and returned to the module on the mono audio signal in circuit.

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

The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.

The navigation radio detects a short to battery on the mono audio signal circuit.
The navigation radio detects a short to ground on the mono audio signal circuit.
All the above conditions are present for greater than 250 mS.

No audio is heard from the OnStar module.

The conditions for setting the DTC are no longer present on either mono audio signal circuit.
A history DTC clears after 50 malfunction-free ignition cycles.

This DTC may be stored as a history DTC without affecting the operation of the module.
If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

If this DTC is retrieved as a current DTC, replace the module that set the DTC.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Pressing the NAV button, located on the Infotainment Faceplate Control Module or faceplate, sends a 5-volt signal on the video display position control circuit to the Display Module Actuator. The 5-volt signal sets the position of the Display Module Actuator commanding the display to the Up position. Pressing the NAV button again removes the signal on the circuit commanding the display to the Down position.

When the display is commanded to the Up position, the motor controller, located in the actuator, sends a 5-volt signal on the video display position signal circuit to the navigation radio. This signal is read by the radio in order to know which graphics to render on the touch-screen display.

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

The ignition must be in the RUN or ACC position.
The system voltage is at least 9.5 volts and no more than 15.5 volts.

All the below conditions are present for greater than 250 mS

The navigation radio detects a short to battery on the popup position sense circuit.
The navigation radio detects a short to ground on the popup position sense circuit.
The navigation radio detects an open on the popup position sense circuit

The Display Module Actuator is inoperative.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, place the navigation display in the down position.
Ignition OFF, disconnect the X4 harness connector at the radio.
Ignition ON, test for less than 1 volt between signal terminal 13 and ground. If greater than specified range, test the signal circuit for a short to voltage. If circuit tests normal, replace the navigation display.
Ignition OFF, test for infinite resistance between the signal terminal 13 and ground. If less than specified range, test the signal circuit for a short to ground. If circuit tests normal, replace the navigation display.
Ignition OFF, disconnect the X2 harness connector at the radio/HVAC display.
Test for less than 5 ohms between the signal circuit terminal 13 X4 at the radio and terminal 5 X2 at the navigation display If greater than specified value, test the circuit for an open/high resistance.
If the circuit tests normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Radio, Video, Audio Disc Player, and Navigation Information Display Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The TV antenna signal circuits consists of 4 individual coaxial cables that carry the TV signal information received by the TV antenna through the TV antenna amplifier to the TV antenna module.

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

The TV antenna module detects a open or short to ground on one or more of the 4 TV antenna coax cables for 20 seconds.

The TV antenna module disables all 4 coax cables when a short to ground is detected. When the TV antenna detects an open/high resistance in one or more TV antenna coax inputs, the unaffected TV antenna coax inputs will continue to operate.

The condition responsible for setting the DTC no longer exists.
The DTC clears after the TV function has been cycled OFF then ON.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the appropriate antenna harness connector at the TV antenna module and the harness connector at the TV antenna amplifier.
Test for less than 5 ohms of resistance between the two ends of the coax cable center conductor. If greater than the specified range, replace the antenna coax cable.
Test for less than 5 ohms of resistance between the two ends of the coax cable outer shield. If greater than the specified range, replace the antenna coax cable.
Test for infinite resistance between the antenna coax center conductor and the outer shield. If less than the specified range, replace the antenna coax cable.
Connect the harness connector at the TV antenna module.
Ignition ON, TV ON, wait 20 seconds, test for more than 1 volt at the coax cable center conductor terminal 2. If less than the specified value, replace the TV antenna module.
Ignition OFF, disconnect the harness connector at the appropriate TV antenna.
Test for less than 5 ohms of resistance between the two ends of the TV antenna coax cable center conductor. If greater than the specified range, replace the TV antenna coax cable.
Test for less than 5 ohms of resistance between the two ends of the TV antenna coax cable outer shield. If greater than the specified range, replace the TV antenna coax cable.
Test for infinite resistance between the TV antenna coax center conductor and the outer shield. If less than the specified range, replace the TV antenna coax cable.
Ignition OFF, TV OFF, connect the harness connector at the TV antenna amplifier.
Ignition ON, TV ON, wait 20 seconds, test for more than 1 volt at the TV antenna coax cable center conductors. If less than the specified value, replace the TV antenna amplifier.
If all circuits test normal, replace the inoperative TV antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Television Antenna Amplifier Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Television Antenna Cable Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Amp Control	DTC B1287 02,**	DTC B1287 04,**	DTC B1287 01,*
* No audio output. ** 4 Channel unmute, possible noise in speakers when radio muted or turned off

The radio amp control circuit provides varying pulse width modulated (PWM) signals to control overall muting of the amplifier. The PWM signals are varying duty cycle percentages ranging from 0-100 percent. A low duty cycle unmutes all amplifier channels and a high duty cycle mutes all amplifier channels. The radio monitors the amp control circuit for faults. When a fault is detected the radio sets the appropriate DTC.

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

The radio is in ACCESSORY, RUN, or RAP power mode.
The system voltage is at least 9 volts and no more than 16 volts.

The radio detects a fault on the Amp Control circuit 400 ms after radio activates the Remote Enable circuit.

Radio sets the DTC and continues to output correct state.

The condition must be corrected.
A history DTC clears after 100 malfunction-free ignition cycles.
The radio receives the clear code command from the scan tool.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Verify the audio system performance by adjusting the fade and balance of the speaker outputs.

RPO Code UQA

Ignition OFF, disconnect the radio X1 harness connector and the X3 amplifier harness connector.
Ignition ON, test for less than 1 volt on the radio audio mute signal terminal 37 X1 at the radio. If greater then the specified value, test the circuit for a short to voltage.
Test for less than 5 ohms between the radio X1 terminal 37 to the amplifier X3 terminal 11. If greater then specified range, test the circuit for an open/high resistance.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Cellular Microphone Signal	B2455 02	B2455 04	B2455 01

The vehicle communication interface module (VCIM) uses the cellular phone microphone to allow driver communication with OnStar.

The vehicle communication interface module (VCIM) and navigation radio use the cellular phone microphone to allow driver communication with OnStar, as well as to operate the voice recognition/voice guidance feature of the navigation radio.

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

A short to battery is detected on the cellular microphone signal circuit

A short to ground is detected on the cellular microphone signal circuit

A open circuit is detected on the cellular microphone signal circuit

The VCIM and/or navigation radio (RPO UAV) will not receive any signal from the microphone.
The OnStar status LED turns red.
Voice recognition will be inoperative

A current DTC clears when the condition for setting the DTC is no longer present.
A history DTC clears after 50 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Without RPO UAV

Ignition OFF, disconnect the harness connector at the cellular microphone.
Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the VCIM.
Ignition ON, test for 9-11 volts 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 VCIM. 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 VCIM.
If all circuits test normal, test or replace the cellular microphone.

With RPO UAV

Ignition OFF, disconnect the X4 harness connector at the navigation radio and the harness connector at the cellular microphone.
Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the VCIM.
Ignition ON, test for 9-11 volts 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 VCIM. 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 VCIM.
If all circuits test normal, test or replace the cellular microphone.
Connect the X4 harness connector at the navigation radio. Verify DTC B2455 is not set as current in the navigation radio. If DTC B2455 is set as current, replace the navigation radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Mobile Telephone Microphone Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for VCIM or navigation radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.

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

The telematics communication interface control module detects a short to ground on the navigation antenna signal circuit.

The telematics communication interface control module detects an open/high resistance on the navigation antenna signal circuit.

The OnStar® status LED turns red.
The OnStar® Call Center cannot locate the vehicle.

The condition responsible for setting the DTC no longer exists.
A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

«OnStar Schematics»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Antenna Coaxial/Connector Cable Identification Table»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__antenna-coaxialconnector-cable-identification-table)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit. See Special Tools .

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

Ignition ON, wait 5 minutes, then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call, verifying the vehicle OnStar system is functioning and the consultant can locate the vehicle.

Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
Connect the EL-49903 to the K73 telematics communication interface control module, place the test antenna on the roof of the vehicle. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) .
Ignition ON, wait 5 minutes, then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call, ask the consultant to verify the vehicle location to confirm the GPS system is functioning. If the OnStar GPS does not function, replace the K73 telematics communication interface module.
Ignition OFF, perform the coax cable test on the coax cable, refer to Component Testing. The coax cable should pass the test. If the coax cable does not pass the test, replace the coax cable.
If all circuits test normal, replace the T4 cellular phone and navigation antenna.

CAUTION

Refer to Test Probe Caution .

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

Coax Cable Test

Ignition OFF, disconnect the GPS and cellular phone coax cable at both components.
Test both for less than 5 ohms between both ends of the coax cables center terminals. If greater than the specified range, replace the failed coax cable.
Test for greater than 10k ohms between the coax cable center wire and the outer coax shield. If less than the specified range, replace the coax cable.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«DTC B2462 (Communication Interface Module)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «DTC B2462 (Navigation Radio)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematics communication interface control module replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

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

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

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

The radio uses the last reported position and the vehicle speed signal to calculate the vehicle position.
Route guidance may be inaccurate.
Turn by turn navigation may be inaccurate or inoperative.

The condition responsible for setting the DTC no longer exists.
A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

Connector End View Reference

Control Module References

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

IMPORTANT

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.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Navigation Antenna Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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.

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

The CIM does not detect the presence of a cellular antenna.
The above conditions are present for greater than 1 second.

The vehicle is unable to connect to the OnStar® Call Center.
The OnStar® status LED turns red.

The CIM detects the presence of a cellular antenna.
A history DTC clears after 50 malfunction-free ignition cycles.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

If the antenna assembly is damaged, replace the cellular antenna.

Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
Ignition ON, test for less than 1 V between the antenna coax center terminal and ground. If greater than the specified range, replace the antenna coax.
Ignition ON, test for less than 1 V between the antenna coax outer shield and ground. If greater than the specified range, replace the antenna coax.
Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax
Test for infinite resistance between the antenna coax outer shield and ground. If less than the specified value, replace the antenna coax
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.
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.
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.
If coax cable tests normal, replace the cellular antenna.
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.

«Digital Radio, Mobile Telephone, and Vehicle Location Base Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
10 V Reference		B2476 04
Control Terminal 14	1	1	2
Control Terminal 15	1	1	2
Control Terminal 11	3	3		B2476 59, B2482 00
Ground		1
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 V via the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resistor allowing a specific voltage to be returned to the CIM over the keypad signal circuit. Depending upon the voltage range returned, the CIM is able to identify which button has been activated.

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

The CIM detects an open/high resistance on the keypad supply voltage circuit.

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.

The OnStar® status LED turns red.
No calls can be placed.
The CIM will ignore all inputs from the OnStar® button assembly.

The condition responsible for setting the DTC no longer exists.
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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the A10 inside rearview mirror.
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.
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.
Ignition OFF, test for 600k-800k 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 keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
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.
If all circuits test normal, test or replace the button assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Inside Rearview Mirror Replacement»(/cadillac/cts/ii-2007-2014/remont/mirrors/#mirror-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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.

Ignition ON.
Battery voltage must be between 9-16 V.
The CIM tests the antenna once every second.

The CIM detects a short to ground in the Bluetooth ® antenna.

The CIM detects an open/high resistance in the Bluetooth ® antenna.

The OnStar ® status LED turns red.
Bluetooth ® functionality is disabled.

The condition responsible for setting the DTC no longer exists.
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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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.
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.

«Wireless Communication Interface Antenna Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
Review the system operation in order to familiarize yourself with the system functions. Refer to «OnStar Description and Operation»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-description-and-operation) .

Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to «Checking Aftermarket Accessories»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
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

«Bluetooth Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Global Positioning System (GPS) Data Not Current or Inaccurate»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Microphone Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Audio Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Button LED Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Call Center Remote Function Requests Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Button Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Unable to Contact OnStar Call Center»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Voice Recognition Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«OnStar Steering Wheel Control Functions Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__onstar-steering-wheel-control-functions-malfunction)

IMPORTANT

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
Review the system operation in order to familiarize yourself with the system functions. Refer to «Radio/Audio System Description and Operation»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__radioaudio-system-description-and-operation) .

Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to «Checking Aftermarket Accessories»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
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

«Radio Poor Reception»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Radio Displays LOC, LOCKED, or CODE»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Noise Compensated Volume Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Digital Radio Poor or No Reception»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Speaker Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«No Global Positioning System (GPS) Reception»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The 3.5mm (1/8 in.) auxiliary audio input jack is located in the center console. When a portable audio playback device is connected to the auxiliary jack, an internal switch pulls the detection signal circuit low and the radio will switch to AUX as the audio source. Audio signals from the device are sent to the radio from the auxiliary jack via the left, right, and common audio signal circuits.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, radio ON, connect a portable audio playback device to the 3.5mm (1/8 in.) auxiliary audio input jack. Verify the infotainment system to switches AUX as the audio source. If the infotainment system does not switch to AUX as the audio source, refer to «Circuit/System Testing»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
Operate the device to begin audio playback, adjusting the volume on the device if necessary. Verify the audio from the device is heard through the vehicle infotainment system. If audio is not heard from the device, attempt to playback audio from another device. If audio cannot be heard from any device connected to the 3.5mm (1/8 in.) auxiliary audio input jack, refer to «Circuit/System Testing»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .

Ignition OFF, disconnect the X315 I/P to console harness connector.
Test for 900-1100 ohms between the audio common signal circuit I/P side connector terminal 5 and ground. 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 specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the radio.
Ignition ON, radio ON, test for less than 4.5-5.5 V between the auxiliary detection circuit I/P side connector terminal 8 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 the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
Install a 3 A fused jumper between the X315 I/P side connector terminals 8 and 5. Verify the infotainment system to switches AUX as the audio source. If the infotainment system does not switch to AUX as the audio source, replace the radio.
Ignition OFF, disconnect the X1 connector at the radio. Test for infinite resistance between the control circuits listed below and ground: left auxiliary audio circuit terminal 24 right auxiliary audio circuit terminal 10 If not the specified value, test the signal circuit for a short to ground.
Test for less than 5 ohms between the radio X1 terminal 24 and the X315 I/P harness side terminal 6. If greater than the specified value, test the signal circuit for an open/high resistance.
Test for less than 5 ohms between the radio X1 terminal 10 and the X315 I/P harness side terminal 7. If greater than the specified value, test the signal circuit for an open/high resistance.
If all circuits test normal, replace the auxiliary audio jack/harness assembly and reconnect all harness connectors. Connect and operate the portable audio playback device. If audio cannot be heard from the device, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

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.

The purpose of this diagnostic is to verify the ability of the CIM to pair to a Bluetooth ® device.
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/
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.
A Bluetooth ® test tool or equivalent can also be used to verify the ability of the customers cellular phone(s) to pair with another device.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify DTC B2485 is not set. If DTC B2485 is set, refer to «DTC B2485»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
Set up a Bluetooth ® test tool or equivalent.
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.
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.
Refer to «Diagnostic Aids»(/cadillac/cts/ii-2007-2014/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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-48028 Digital Radio Test Antenna. See Special Tools .

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»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
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.

Ignition OFF, disconnect the digital radio antenna coax from the radio. Connect the EL-48028 to the radio and place on the roof of the vehicle. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) . Move the vehicle outside in an area with an unobstructed view of the southern sky.
Ignition ON, radio tuned to XM channel 1, verify XM reception is clear and uninterrupted. If reception is not clear, replace the radio.
Ignition OFF, reconnect the antenna coax cable at the radio. Disconnect the antenna coax cable from the digital radio antenna.
Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and outer shield. If less than the specified range, test the antenna coax cable for an open/high resistance. If greater than the specified range, test the antenna coax cable for a short to voltage.
If all circuits test normal, replace the digital radio antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Digital Radio, Mobile Telephone, and Vehicle Location Base Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
DVD Control Module B+		1
Left Display B+	2	2	2
Right Display B+	3	3	3
Left Audio Signal (+)	4	5	4
Right Audio Signal (+)	6	7	6
Left DVD Video Signal (+)	8	8	8
Right DVD Video Signal (+)	9	9	9
Left Display Video Ground	8	8	8
Right Display Video Ground	9	9	9
Left Display Ground		2	2
Right Display Ground		3	3
DVD Control Module Ground		1
1. DVD Control Module inoperative, both displays inoperative. 2. Left display inoperative. 3. Right display inoperative. 4. Left audio distorted. 5. No sound from left audio. 6. Right audio distorted. 7. No sound from right audio. 8. Left display blank. 9. Right display blank.

The DVD displays are grounded and powered by the DVD control module. When a movie is playing, the video signals are sent from the player, to the DVD control module, and back to the display. This allows the other monitor to source the same video as the player with the disc.

Schematic Reference

Connector End View Reference

Video Entertainment System Description and Operation (Non-Headrest DVD Systems) or Video Entertainment System Description and Operation (Dual Headrest DVD Systems)

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

One Display Inoperative

Ignition OFF, disconnect the X1 harness connector at the appropriate display.
Ignition ON, test for less than 5 ohms between the ground circuit terminal 5 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground. If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground: I2C Clock Signal - terminal 5 I2C Data - terminal 6 If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module. If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
If all circuits test normal, replace the appropriate display.

Both Displays Inoperative

Ignition OFF, disconnect the X1 harness connector at the DVD control module.
Test for less 5 ohms between the ground circuit terminal 3 and ground. If the greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, test for B+ between the accessory voltage circuit terminal and ground. If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
Ignition OFF, Reconnect the X1 harness connector at the DVD control module
Disconnect the X1 harness connector at the driver seat headrest.
Ignition ON, test for less than 5 ohms between the ground circuit terminal 5 and ground. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
Ignition ON, test for B+ between the ignition voltage circuit terminal 6 and ground. If less than the specified value, B+ circuit for an open/high resistance. If the circuit tests normal, replace the DVD control module.
Ignition OFF, reconnect the X1 harness connector, and disconnect the X2 harness connector at the display.
Ignition ON, test for 4.5-5.5 V between the terminals listed below and ground: I2C Clock Signal - terminal 5 I2C Data - terminal 6 If less than specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the DVD control module. If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DVD control module.
If all circuits test normal, replace the appropriate display.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

One Display Inoperative (Dual Display)

Turn ON the ignition, press the power button on the suspect display. Verify the suspect DVD display does not power up. If the DVD display powers up but the screen is blank and will not play any DVDs, replace the DVD display.
At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 6 and ground. Verify that a test lamp illuminates between terminal 6 and ground. If the test lamp does not illuminate, replace the DVD control module.
At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 5 and B+. Verify that a test lamp illuminates between terminal 5 and B+. If the test lamp does not illuminate, replace the DVD control module.
Disconnect the suspect black or red connector from the suspect DVD display. At the black or red DVD display connector, Test for B+ at terminal 6. If B+ is not present replace the DVD display harness.
At the black or red DVD display connector, test for less than 1.0 ohm between the ground circuit terminal 5 and ground. If greater than the specified range, replace the DVD display harness. If all circuits test normal replace the suspect DVD display.

Display Inoperative (Single Display) or Both Displays Inoperative (Dual Display)

Turn ON the ignition, press the power button on both suspect displays. Verify the suspect DVD displays do not power up. If the DVD display powers up but the screen is blank and will not play any DVDs, replace the suspect DVD display.
Disconnect the 2 wire connector from the DVD control module. At the 2 wire harness connector, test for less than 1.0 ohm between the ground circuit terminal and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
At the DVD control module 2 wire harness connector, verify that a test lamp illuminates between the B+ circuit terminal and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
Reconnect the 2 wire harness connector at the DVD control module
At the DVD control module, touch a test lamp at the back of the black or red connector between terminal 1 and ground. Verify that a test lamp illuminates between terminal 1 and ground. If the test lamp does not illuminate, replace the DVD control module.
At the DVD control module, touch a test lamp at the back of the suspect black or red connector between terminal 2 and B+. Verify that a test lamp illuminates between terminal 2 and B+. If the test lamp does not illuminate, replace the DVD control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Dual DVD Rear Seat Entertainment Headrest Package Installation

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The infrared transmitter is internal to the DVD display and is grounded and powered by the DVD control module. When listening to the headphones, the infrared transmitter sends an infrared signal to the headphones. There are two channels on the headphones, the first channel is dedicated to the driver side video screen, and the other channel is dedicated to the passenger side. The audio that is sent over the DVD audio signal circuits is a varying AC voltage.

Schematic Reference

Connector End View Reference

Video Entertainment System Description and Operation (Non-Headrest DVD Systems) or Video Entertainment System Description and Operation (Dual Headrest DVD Systems)

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Dual DVD Rear Seat Entertainment Audio Malfunction - With FM Antenna

Turn ON the ignition, tune the radio to station 88.3, 88.7, 89.1, 89.5, 89.9, or 90.3MHz. Chose the station that has the least amount of regular audible radio reception.
Headrest DVD displays ON, insert a DVD and operate the DVD player in play mode.
DVD playing, DVD Surround Sound ON, set the DVD Player to the same station as the radio. Verify audio can be heard through the radio. If the DVD audio can be heard review the system operation with the customer.
Verify the DVD player is in play mode.
At the DVD control module, test for AC voltage between terminal 6 and terminal 3 or 4 with a DMM at the back of the black or red connector. If AC voltage is present replace the DVD control module.
Turn the DVD player off and disconnect both connectors from the DVD display that was playing the DVD.
Swap the two connectors on the display and swap the two corresponding connectors at the DVD control module. Verify the DVD audio now operates normally. If the DVD audio now operates normally, replace the DVD display harness. It the DVD audio is still inoperative replace the suspect DVD display.

Dual DVD Rear Seat Entertainment Audio Malfunction - Without FM Antenna

Turn ON the ignition, tune the radio to station 88.3, 88.7, 89.1, 89.5, 89.9, or 90.3MHz. Chose the station that has the least amount of regular audible radio reception.
Press the power button on the headrest DVD displays. Insert a DVD and operate the DVD player in play mode. Verify the DVD audio is distorted on one of the above stations. If the DVD audio can be heard review the system operation with the customer.
Turn the DVD player off and disconnect both connectors from the DVD display that was playing the DVD.
Swap the two connectors on the display and swap the two corresponding connectors at the DVD control module. Verify the DVD audio now operates normally. If the DVD audio now operates normally, replace the DVD display harness. If the DVD audio distortion persists, replace the DVD control module.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Turn ON the ignition, press the power button on one of the displays and insert a DVD. Operate the DVD player in play mode.
Press the power button on the other display. Press the source button to view the DVD video playing on the adjacent display. Verify that the video displays do not synchronize. Test or repair the suspect video in/out signal circuit for a short to B+, short to ground or open circuit. If all circuits test normal replace the DVD control module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Refer to Dual DVD Rear Seat Entertainment Headrest Package Installation

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. Test or replace the headphone batteries before performing Circuit/System Verification.

Verify there are no obstructions that may block the infra-red port located above the video display screen.
Radio ON, DVD playing, verify all of the headphones are working properly and the power indicator illuminates. If all of the headphones are inoperative, or the sound is distorted, refer to «Circuit/System Testing»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) . If only one of the headphones is not producing sound on either channel, or the sound is distorted, replace the appropriate set of headphones.
Using a known good pair of wired headphones, plug them into both of the headphone jacks on the front of each DVD Monitor. If there is audio emitted from the wired headphones, and not the wireless headphones, replace the appropriate display.

Note. Select both channels by switching the channel selector located on the side of the headphones and verify the volume is turned up. Also verify that the headphones are not in mute mode. Press the Sound Around ON/OFF button on the remote to change audio muting status.

Ignition OFF, disconnect the appropriate seat headrest X2 connector at the monitor.
Ignition ON, DVD playing, test for 15-40 mV A/C between the terminals on the monitor listed below and ground. Right Audio Signal - terminal 3 Left Audio Signal - terminal 4 If the not within the specified range, replace the appropriate DVD display.
Ignition OFF, reconnect the harness connector at the monitor.
Disconnect the appropriate seat headrest X2 connector at the DVD control module.
Ignition ON, DVD playing, test for 15-40 mV A/C between the terminals on the monitor listed below and ground. Right Audio Signal - terminal 3 Left Audio Signal - terminal 4 If the not within the specified range, replace the wiring harness.
If all circuits test normal, replace the DVD control module.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The infrared transmitter is internal to the DVD display and is grounded and powered by the DVD control module. When listening to the remote control, the remote sends an infrared signal to the infrared receiver. No external circuits are involved.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. Test or replace the remote batteries before performing Circuit/System Verification.

Verify there are no obstructions that may block the infra-red port located above the video display screen.
DVD playing, press multiple buttons on the remote control and verify the remote operatives properly at both monitors. If remote fails to operate either DVD monitor, replace the remote. If remote operates only one DVD monitor, replace the inoperative monitor.

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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.

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.
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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. It is 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.

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»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
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»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
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.

Disconnect the navigation antenna coax cable from the CIM.
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.
Reconnect the coax cable to the CIM. Disconnect the coax cable from the navigation antenna.
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.
If all circuits test normal, replace the navigation antenna.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Digital Radio, Mobile Telephone, and Vehicle Location Base Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Cellular Microphone Signal	B2455 02	B2455 04	B2455 01

The communication interface module (CIM) uses the cellular phone microphone to allow driver communication with OnStar.

The communication interface module (CIM) and navigation radio use the cellular phone microphone to allow driver communication with OnStar, as well as to operate the voice recognition/voice guidance feature of the navigation radio.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Without RPO UAV

Ignition OFF, disconnect the harness connector at the cellular microphone.
Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
Ignition ON, test for 9-11 volts 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 CIM. 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 CIM.
If all circuits test normal, replace the cellular microphone.

With RPO UAV

Ignition OFF, disconnect the X4 harness connector at the navigation radio and the harness connector at the cellular microphone.
Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
Ignition ON, test for 9-11 volts 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 CIM. 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 CIM.
If all circuits test normal, replace the cellular microphone.
Connect the X4 harness connector at the navigation radio. Verify DTC B2455 is not set as current in the navigation radio. If DTC B2455 is set as current, replace the navigation radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Mobile Telephone Microphone Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM or navigation radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provide an overview of each diagnostic category.

The vehicle navigation radio provides verbal directions to the driver through the radio speakers. The navigation radio sends an audio voice signal to the amplifier on two dedicated circuits.

Schematic Reference

Connector End View Reference

Description and Operation

Control Module References

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Ignition OFF, disconnect the radio harness connector X4 and amplifier harness connector X3.
Test for less than 1 volt on the navigation audio signal (+) circuit radio harness connector terminal 7 and ground. If greater than specified value, test for a short to voltage.
Test for greater than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and ground. If less than specified value, test for a short to ground.
Test for less than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and the amplifier harness connector terminal 13. If greater than specified value, test for an open/high resistance.
Test for less than 1 volt on the navigation audio signal (-) circuit radio harness connector terminal 17 and ground. If greater than specified value, test for a short to voltage.
Test for greater than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and ground. If less than specified value, test for a short to ground.
Test for less than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and the amplifier harness connector terminal 5. If greater than specified value, test for an open/high resistance.
If all circuits test normal, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

If the OnStar® voice recognition is inoperative, refer to «OnStar Microphone Malfunction»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .

Ignition OFF, disconnect the X3 harness connector at the CIM.
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.
Ignition ON, test for less than 1 volt between the navigation voice low reference circuit terminal 4 ground. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
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 an open/high resistance. If the circuit tests normal, replace the radio.
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.
Ignition OFF, disconnect the X4 harness connector at the radio.
Test for infinite resistance between ground and the navigation voice low reference circuit terminal 16. If less than the specified value, test the low reference circuit for a short to ground.
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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Audio Signal	1	1	1
Audio Common Signal		1
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 audio signals to the audio system.

Schematic Reference

«OnStar Schematics»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Radio/Navigation System Schematics»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .
Ignition ON, radio ON, 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»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) .

Ignition OFF, disconnect the X1 harness connector at the A11 radio.
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. Terminal 20 Terminal 6 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.
If all circuits test normal, replace the A11 radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

IMPORTANT

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.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Navigation Antenna Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the harness connector at the noise compensation microphone.
Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage circuit terminal B and ground. If less than the specified range, test the voltage supply 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 voltage supply circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
Ignition ON, test for 8.5-9.5 volts between the noise compensation microphone supply voltage 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.
If all circuits test normal, replace the noise compensation microphone.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Radio Volume Compensator Interior Noise Microphone Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for Audio Amplifier replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Keypad Supply Voltage	B2476 00	B2476 00	B2476 00
Keypad Green LED Signal	1	1	2
Keypad Red LED Signal	1	1	2
Keypad Signal	3	3
Inside Rearview Mirror Ground		1
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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, 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.
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.

Ignition OFF, disconnect the harness connector at the inside rearview mirror.
Doors closed, courtesy lamps OFF, test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, command the green LED OFF with a scan tool. Test for less than 1 V 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.
Command the green LED ON with a scan tool. Test for greater than 9 V 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.
Command the red LED OFF with a scan tool. Test for less than 1 V 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.
Command the red LED ON with a scan tool. Test for greater than 9 V 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.
If all circuits test normal, replace the inside rearview mirror.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Inside Rearview Mirror Replacement»(/cadillac/cts/ii-2007-2014/remont/mirrors/#mirror-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

IMPORTANT

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

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»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
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»(/cadillac/cts/ii-2007-2014/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

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Keypad Supply Voltage	B2476 00	B2476 00	B2476 00
Keypad Green LED Signal	1	1	2
Keypad Red LED Signal	1	1	2
Keypad Signal	3	3		B2482 00
Inside Rearview Mirror Ground		1
1. OnStar® LED Inoperative 2. LED Illuminated At All Times 3. OnStar® Buttons Inoperative

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

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

If some OnStar® buttons are inoperative but not all, replace the inside rearview mirror.
If none of the OnStar® buttons operate, refer to circuit/system testing.

Ignition OFF, disconnect the harness connector at the inside rearview mirror.
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.
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.
Ignition OFF, test for 600k-800k 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 keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
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.
If all circuits test normal, test or replace the button assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Inside Rearview Mirror Replacement»(/cadillac/cts/ii-2007-2014/remont/mirrors/#mirror-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for CIM replacement, setup, and programming

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 Malfunction , to begin diagnosis of the steering wheel control concern.

SYSTEM	COAX TYPE	PURPLE	BLUE	CURRY (Mustard Yellow)	GREEN
OnStar (Cellular)	RG 58	X
GPS	RG 174		X
XM	RG 316			X
XM w/High Gain Antenna Module (Cables longer than 4400 mm (14.5 ft))					X

ONSTAR, GPS, XM, AM/FM-CONNECTOR IDENTIFICATION AT CIM

CONNECTOR CONFIGURATION	OnStar (Cellular) PURPLE	GPS BLUE	XM CURRY (Mustard Yellow)	XM GREEN	AM/FM
3 Individual Connectors	X	X	X
2 Individual Connectors	X	X
3 Way Connector w/3 COAX Cables	X	X	X
3 Way Connector w/2 COAX Cables with a Separate Connector for XM	X	X	X (S)
3 Blue 2 Way Connectors + Power Feed (Hexband)	X		X		X
1 Connector with Splitter	X (S)	X (S)
High Gain Antenna XM 3 Individual Connectors (ver 1)	X	X		X
High Gain Antenna XM Blue 2 Way with Separate Green Connector (ver 2)	2 way	2 way		X

CONNECTOR IDENTIFICATION AT ONSTAR ANTENNA BASE

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The vehicle identification number (VIN) in the radio is a single one-time VIN learn.

Schematic Reference

Connector End View Reference

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information.

Ignition ON, using the scan tool, verify that the VIN, digits 2-17, of the radio matches the VIN, digits 2-17, of the vehicle.

If not the specified value, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for radio replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

AM and FM radio reception is dependent on the following components

Radio antenna - part of the rear glass
Coax cable between the radio antenna and the radio antenna module
Radio antenna module
Coax cable between the radio antenna module and the radio
Radio

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

AM reception is highly dependent on the antenna module receiving battery voltage from the radio. The antenna module has a built in antenna amplifier that boosts both AM and FM reception. When the antenna module no longer receives power, the radio will still receive FM stations and loose all AM stations.

Schematic Reference

Connector End View Reference

Radio Rear Speaker Replacement (Sedan)

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition OFF, disconnect the coax from the antenna located at the rear glass.
Verify the coax connector at the back glass is properly secured and free of any damage. If damage is found, repair or replace as necessary.
Inspect the antenna on the rear glass. Verify all branches of the antenna are intact, with no scratches or other damage. If damage is found, repair or replace as necessary.
Inspect the radio antenna module grounding surfaces and the mounting hardware for any corrosion that may cause a poor ground. If corrosion is noted, clean the grounding surfaces or hardware.
Disconnect the harness connector at the antenna module.
Ignition ON, radio ON, verify a test lamp illuminates between the entertainment remote enable signal circuit terminal 1, and ground. If test lamp does not illuminate, test the circuit for short to ground or an open/high resistance. If circuit tests normal, replace the radio.
Disconnect the antenna coax from the radio and the radio antenna module.
Test for infinite resistance between the antenna coax center terminal and ground. If less than the specified value, replace the antenna coax.
Test for less than 5 ohms of resistance on the antenna coax center terminal from end to end. If greater than the specified range, replace the antenna coax.
Test for less than 5 ohms of resistance on the antenna coax outer shield from end to end. If greater than the specified range, replace the antenna coax.
Test for infinite resistance between the coax center terminal and the outer shield. If less than the specified value, replace the antenna coax.
If all circuits test normal, replace the antenna module.
Ignition ON, radio ON, verify radio reception has improved. If there is still poor reception, replace the radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Radio Antenna Module Replacement (Sedan)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Radio Antenna Module Replacement (Wagon)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio replacement, setup, and programming

Component	Repair Instruction
Front Speakers	Refer to Radio Front Speaker Replacement
Front Pillar Speakers	Refer to Radio Front Side Door Lower Speaker Replacement
Rear Pillar Speakers	Refer to Radio Rear Speaker Replacement (Sedan)
Rear Door Speakers	Refer to Radio Rear Side Door Speaker Replacement (Sedan, Wagon)

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit	Short to Ground	Open/High Resistance	Short to Voltage
Amplifier B+		2
Speaker Output Circuit (+)	B1XXX 02,*	B1XXX 04,*	B1XXX 01,*
Speaker Output Circuit (-)	B1XXX 02,*	B1XXX 04,*	B1XXX 01,*
Subwoofer Signal (+)	B1075 02,**	1	B1075 01,**
Subwoofer Signal (-)	B1075 02,**	1	B1075 01,**
Amplifier Control	B1287 02	B1287 04	B1287 01
Amplifier Ground		2
1. No or reduced sound from subwoofer 2. Amplifier inoperative/no sound from speaker * Sets associated speaker DTC with appropriate symptom type - see DTC descriptors ** Noticeable audio distortion possible

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.
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

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

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

If audio is inoperative from all speakers, refer to Amplifier Circuit Malfunction.
If audio is inoperative from one or more, but not all, speakers or the audio emitted from the speakers is not clear, refer to the appropriate Speaker Circuit Malfunction.

Note. On Right Hand Drive (RHD) Models, only the Amplifier X3 connector is different from Left Hand Drive (LHD).

Amplifier Circuit Malfunction

Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
Ignition OFF, test for less than 1 V between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an short to voltage.
Ignition OFF, test for less than 10 ohms between the ground circuit terminal 8 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, test for B+ between the B+ circuit terminal 4 and ground. If less then specified value, test the circuit for a short to ground, or an open/high resistance.
Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
For RPO UQA only: Radio ON, test for B+ between the Entertainment remote enable circuit terminal 8 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 radio.
If all circuits test normal, replace the audio amplifier.

Speaker Malfunction Radio Output Testing RPO UQA - LHD

Ignition OFF, disconnect the X3 connector at the amplifier.
Radio ON, test for a varying mV AC voltage reading between the appropriate signal circuit terminals listed below and ground. Left front low level audio signal (+) - terminal 15 X3 Left front low level audio signal (-) - terminal 7 X3 Right front low level audio signal (+) - terminal 14 X3 Right front low level audio signal (-) - terminal 6 X3 Left rear low level audio signal (+) - terminal 13 X3 Left rear low level audio signal (-) - terminal 5 X3 Right rear low level audio signal (+) - terminal 12 X3 Right rear low level audio signal (-) - terminal 4 X3 If the varying 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 radio.
If all circuits test normal, replace the amplifier.

Speaker Malfunction Radio Output Testing RPO UQA - RHD

Ignition OFF, disconnect the X3 connector at the amplifier.
Radio ON, test for a varying mV AC voltage reading between the appropriate signal circuit terminals listed below and ground. Left front low level audio signal (+) - terminal 14 X3 Left front low level audio signal (-) - terminal 6 X3 Right front low level audio signal (+) - terminal 15 X3 Right front low level audio signal (-) - terminal 7 X3 Left rear low level audio signal (+) - terminal 12 X3 Left rear low level audio signal (-) - terminal 4 X3 Right rear low level audio signal (+) - terminal 13 X3 Right rear low level audio signal (-) - terminal 5 X3 If the varying 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 radio.
If all circuits test normal, replace the amplifier.

Speaker Malfunction Radio Output Testing RPO UQS

Ignition OFF, disconnect the X3 and X4 harness connectors at the amplifier.
Ignition ON, radio ON, test for a varying mV AC voltage reading between the appropriate signal circuit terminals listed below and ground. Left front low level audio signal (+) - terminal 11 X3 Left front low level audio signal (-) - terminal 12 X3 Right front low level audio signal (+) - terminal 3 X3 Right front low level audio signal (-) - terminal 4 X3 Left rear low level audio signal (+) - terminal 11 X4 Left rear low level audio signal (-) - terminal 12 X4 Right rear low level audio signal (+) - terminal 3 X4 Right rear low level audio signal (-) - terminal 4 X4 Center channel low level audio signal (+) - terminal 13 X4 Center channel low level audio signal (-) - terminal 14 X4 Subwoofer low level audio signal (+) - terminal 5 X4 Subwoofer low level audio signal (-) - terminal 6 X4 If the varying 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 radio.
If all circuits test normal, replace the amplifier.

Speaker Malfunction Amplifier Output Testing RPO UQA

Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
Radio ON, test for less than 1 V between the appropriate signal circuit terminal listed below and ground: Left front speaker output (+) - terminal 5 X1 Left front speaker output (-) - terminal 1 X1 Right front speaker output (+) - terminal 8 X2 Right front speaker output (-) - terminal 7 X2 Left rear speaker output (+) - terminal 15 X2 Left rear speaker output (-) - terminal 16 X2 Right rear speaker output (+) - terminal 2 X2 Right rear speaker output (-) - terminal 1 X2 Front center speaker output (+) - terminal 4 X2 Front center speaker output (-) - terminal 3 X2 Rear subwoofer speaker output (+) - terminal 7 X1 Rear subwoofer speaker output (-) - terminal 3 X1 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
Radio ON, test for infinite resistance between the appropriate signal circuit terminal listed below and ground: Left front speaker output (+) - terminal 5 X1 Left front speaker output (-) - terminal 1 X1 Right front speaker output (+) - terminal 8 X2 Right front speaker output (-) - terminal 7 X2 Left rear speaker output (+) - terminal 15 X2 Left rear speaker output (-) - terminal 16 X2 Right rear speaker output (+) - terminal 2 X2 Right rear speaker output (-) - terminal 1 X2 Front center speaker output (+) - terminal 4 X2 Front center speaker output (-) - terminal 3 X2 Rear subwoofer speaker output (+) - terminal 7 X1 Rear subwoofer speaker output (-) - terminal 3 X1 If less than the specified value, test both circuits of the affected speaker for a short to ground.
If all circuits test normal, reconnect all harness connectors at the amplifier.
Ignition ON, radio ON, disconnect the appropriate speaker.
Test for 5.0-7.5 V between the signal circuit terminals and ground. If less then the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier. If greater then the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
If the circuit tests normal, replace the appropriate speaker.

Speaker Malfunction Amplifier Output Testing RPO Code UQS

Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.
Radio ON, test for less than 1 V between the appropriate signal circuit terminal listed below and ground: Left front tweeter speaker output (+) - terminal 4 X2 Left front tweeter speaker output (-) - terminal 5 X2 Right front tweeter speaker output (+) - terminal 7 X2 Right front tweeter speaker output (-) - terminal 6 X2 Left rear speaker output (+) - terminal 16 X2 Left rear speaker output (-) - terminal 8 X2 Right rear speaker output (+) - terminal 15 X2 Right rear speaker output (-) - terminal 14 X2 Front center speaker output (+) - terminal 13 X2 Front center speaker output (-) - terminal 12 X2 Left rear subwoofer speaker output (+) - terminal 5 X1 Left rear subwoofer speaker output (-) - terminal 6 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left front speaker output (+) - terminal 1 X1 Left front speaker output (-) - terminal 2 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left rear midrange speaker output (+) - terminal 11 X2 Left rear midrange speaker output (-) - terminal 10 X2 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
Radio ON, test for infinite resistance between the appropriate signal circuit terminal listed below and ground: Left front tweeter speaker output (+) - terminal 4 X2 Left front tweeter speaker output (-) - terminal 5 X2 Right front tweeter speaker output (+) - terminal 7 X2 Right front tweeter speaker output (-) - terminal 6 X2 Left rear speaker output (+) - terminal 16 X2 Left rear speaker output (-) - terminal 8 X2 Right rear speaker output (+) - terminal 15 X2 Right rear speaker output (-) - terminal 14 X2 Front center speaker output (+) - terminal 13 X2 Front center speaker output (-) - terminal 12 X2 Left rear subwoofer speaker output (+) - terminal 5 X1 Left rear subwoofer speaker output (-) - terminal 6 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left front speaker output (+) - terminal 1 X1 Left front speaker output (-) - terminal 2 X1 Right front speaker output (+) - terminal 7 X1 Right front speaker output (-) - terminal 3 X1 Left rear midrange speaker output (+) - terminal 11 X2 Left rear midrange speaker output (-) - terminal 10 X2 If less than the specified value, test both circuits of the affected speaker for a short to ground.
If all circuits test normal, reconnect all harness connectors at the amplifier.
Ignition OFF, disconnect the appropriate speaker.
Radio ON, test for 5.0-7.5 V between the signal circuit terminals and ground. If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier. If greater then the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
If the circuit tests normal, replace the appropriate speaker.

Powered Subwoofer Malfunction RPO UQS

Disconnect the harness connector at the inoperative subwoofer.
Ignition ON, test for less than 1 V between the ground circuit terminal B and ground. If greater than the specified range, test the ground circuit for an short to voltage.
Ignition OFF, test for less than 10 ohms between the ground circuit terminal B and ground If greater than specified range, test the ground circuit for an open/high resistance.
Ignition ON, test for B+ between circuit terminal A and ground. If less then the specified value, test the B+ circuit for a short to ground or an open/high resistance.
Radio ON, test for B+ between the radio audio mute signal circuit terminal C 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 amplifier.
Radio ON, test for 5.0-7.5 V between the signal circuit terminal E 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.
Test for 5.0-7.5 V between the signal circuit terminal D 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.
If all circuits test normal, replace the subwoofer.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Speaker Replacement Reference»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__speaker-replacement-reference)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for amplifier or radio replacement

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

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.
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.
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.
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

«OnStar Schematics»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Antenna Coaxial/Connector Cable Identification Table»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__antenna-coaxialconnector-cable-identification-table)

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit. See Special Tools .

If the unit does not connect to the OnStar Call Center, verify the vehicles OnStar subscription is valid, has not expired and is in good standing.

Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
Connect the EL-49903 to the K73 telematics communication interface control module, place the test antenna on the roof of the vehicle. See «Special Tools»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system__special-tools) .
Ignition ON, wait 5 minutes, and then contact the OnStar call center consultant by pressing the blue OnStar button. A call center consultant should answer the call. If the unit does not connect to the OnStar Call Center and the subscription is valid, use a scan tool to obtain and record the following information: Electronic Serial Number (ESN), Station Identifier (STID), GM 8-digit part number, Mobile Identification Number (MIN), Mobile Dialed Number (MDN), Transceiver ID (Trans ID) and call GM TAC.
Request the consultant to verify the vehicle location to confirm the GPS system is functioning. If the OnStar GPS does not function, replace the K73 telematics communication interface module.
Ignition OFF, perform the coax cable test on the coax cable, refer to Component Testing. The coax cable should pass the test. If the coax cable does not pass the test, replace the coax cable.
If all circuits test normal, replace the T4 cellular phone and navigation antenna.

CAUTION

Refer to Test Probe Caution .

Coax Cable Test

Ignition OFF, disconnect the GPS and cellular phone coax cable at both components.
Test both for less than 5 ohms between both ends of the coax cables center terminals. If greater than the specified range, replace the failed coax cable.
Test for greater than 10k ohms between the coax cable center wire and the outer coax shield. If less than the specified range, replace the coax cable.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

«Digital Radio, Mobile Telephone, and Vehicle Location Base Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for telematic communication interface control module replacement, setup, and programming

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the navigation radio is on, a discrete 12 V signal is supplied on the Entertainment Remote Enable Signal circuit to the Display Module and Display Actuator. This signal is used to control the power state of the modules.

Schematic Reference

Connector End View Reference

Description and Operation

Electrical Information Reference

«Circuit Testing»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
«Connector Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
«Testing for Intermittent Conditions and Poor Connections»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
«Wiring Repairs»(/cadillac/cts/ii-2007-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. The ignition circuit supplied by the radio controls the Display Module and Display Module Actuator. Each of the modules/components will need to be disconnected if the ignition circuit test fails for a short to voltage or short to ground. Disconnect one module/component at a time while testing the ignition circuit for a short to voltage or short to ground. If the fault is no longer present when disconnecting a module/component replace that module/component. If the fault is still present with all the modules/components disconnected, repair the circuit.

Display Power/Display Actuator Malfunction

Ignition OFF, disconnect one of the connectors listed below at an inoperative module/component: Radio/HVAC Display X1 Radio/HVAC Display X2
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal listed below and ground. Radio/HVAC Display X1 - terminal 4 Radio/HVAC Display X2 - terminal 3 If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the radio.
If all circuits test normal, replace the module/component that was disconnected in step 1.

Perform the Diagnostic Repair Verification after completing the repair.

«Radio Antenna Module Replacement (Sedan)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system) or «Radio Antenna Module Replacement (Wagon)»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Radio, Video, Audio Disc Player, and Navigation Information Display Replacement»(/cadillac/cts/ii-2007-2014/remont/entertainment-systems/#cellular-system-entertainment-system-and-navigation-system)
«Control Module References»(/cadillac/cts/ii-2007-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for radio and amplifier replacement, programming, and setup

Perform the «Diagnostic System Check - Vehicle»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
Review «Strategy Based Diagnosis»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
«Diagnostic Procedure Instructions»(/cadillac/cts/ii-2007-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__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