Audio System with Navigation: Diagnosis Saab 9-5 II

OnStar® Cellular, GPS, and Diagnostic Limitations

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

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

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

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

Diagnostic Instructions

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptor

DTC B0000 5A

Vehicle Speed Information Circuit Not Plausible

Diagnostic Fault Information

Conditions for Running the DTC

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

Conditions for Setting the DTC

1. Vehicle speed from serial data is more than 5 km/h (3 MPH) and vehicle speed pulse from the EBCM is 0 km/h (0 MPH).
2. Vehicle speed calculated from the navigation processing software is more than 36 km/h (22 MPH) and vehicle speed pulse from the EBCM is 0 km/h (0 MPH) for 10 s continuously.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

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

Scan Tool Reference

CONTROL MODULE REFERENCES for scan tool information

Circuit/System Testing

1. Ignition ON, verify there are no DTCs set in the EBCM.
2. If any DTC is present in the EBCM refer to «AUDIO SYSTEM WITH NAVIGATION DTC INDEX»(ref-653672-S02666527822014111000000) to diagnose this DTC prior to this diagnostic.
3. Ignition OFF, disconnect the X4 harness connector at the A11 Radio.
4. Ignition ON, operate the vehicle drive wheels at 8 km/h (5 MPH). Test for 3-7 Hz between the signal circuit terminal 20 and ground.
5. If not within the specified range, test the signal circuit terminal 20 for an open, high resistance, short to ground or short to voltage. If the circuit tests normal replace the K17 Electronic Brake Control Module.
6. If the circuit tests normal, replace the A11 Radio.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1020 00

Auxiliary Electronic Control Unit Malfunction

1. Ignition is ON or in the ACCESSORY position.
2. The system voltage is between 9.5-15.5 V.
3. All the above conditions are present for greater than 10 s.

The radio receives an improper status response indicating an internal electronic control unit fault or a stuck button in the radio display assembly.

No action is taken.

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

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1025 01

Left Front Audio Output Circuit Short to Battery

DTC B1025 02

Left Front Audio Output Circuit Short to Ground

DTC B1025 04

Left Front Audio Output Circuit Open

DTC B1035 01

Right Front Audio Output Circuit Short to Battery

DTC B1035 02

Right Front Audio Output Circuit Short to Ground

DTC B1035 04

Right Front Audio Output Circuit Open

DTC B1045 01

Left Rear Audio Output Circuit Short to Battery

DTC B1045 02

Left Rear Audio Output Circuit Short to Ground

DTC B1045 04

Left Rear Audio Output Circuit Open

DTC B1055 01

Right Rear Audio Output Circuit Short to Battery

DTC B1055 02

Right Rear Audio Output Circuit Short to Ground

DTC B1055 04

Right Rear Audio Output Circuit Open

1. The ignition is in the RUN or ACCESSORY position.
2. The system voltage is between 9.5-15.5 V.
3. All the above conditions are present for greater than 10 s.

B1025 01, B1035 01, B1045 01, B1055 01

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

B1025 02, B1035 02, B1045 02, B1055 02

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

B1025 04, B1035 04, B1045 04, B1055 04

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

The radio disables the audio output to the speaker signal circuit with the current fault.

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

CONTROL MODULE REFERENCES for scan tool information

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1259 02

Antenna Ground Circuit Short to Ground

The ignition is ON.

B1259 02

The digital audio broadcast module detects a short to ground in the antenna circuit.

The radio no longer emits audio when on digital audio broadcast radio.

1. A current DTC will clear when the conditions for setting the DTC are no longer present.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

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

CONTROL MODULE REFERENCES for scan tool information

1. With the ignition OFF, disconnect the radio antenna cable from the Digital Radio Receiver control module, A12 and from the Tranceiver module for the digital radio.
2. Test for infinite resistance between the antenna cable center terminal and ground. If less than the specified value, replace the antenna cable
3. Test for less than 5 ohms on the antenna cable center circuit from end to end. If greater than the specified range, replace the antenna cable.
4. Ignition ON, test for less than 1 V between the antenna cable center terminal and ground. If greater than the specified range, replace the antenna cable.
5. Test for infinite resistance between the cable center terminal and the outer shield. If less than the specified value, replace the antenna cable
6. With the ignition OFF, connect the coaxial antenna cable to the Digital Radio Receiver control module, A12.
7. With the ignition ON, radio ON and set to DAB, test with respect to 12-15 V between antenna cable's inner conductor and its outer shielding. If the value is not within the specified range, replace Digital Radio Receiver control module, A12.
8. If all circuits have normal test results, replace the Tranceiver control module for digital radio.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B125A 02

Antenna Signal Circuit Short to Ground

DTC B125A 04

Antenna Signal Circuit Open

1. Ignition ON
2. The battery voltage is between 9-16 V.

B125A 02

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

B125A 04

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

Radio reception may be poor or not available.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the radio antenna cable from the A11 Radio and from the Radio antenna module K46.
2. Test for infinite resistance between the antenna cable center terminal and ground.
3. If less than the specified value, replace the antenna cable.
4. Test for less than 5 ohms on the antenna cable center circuit from end to end.
5. If greater than the specified range, replace the antenna cable.
6. Ignition ON, test for less than 1 V between the antenna cable center terminal and ground.
7. If greater than the specified range, replace the antenna cable.
8. Test for infinite resistance between the cable center terminal and the outer shield.
9. If less than the specified value, replace the antenna cable.
10. Connect the antenna cable to the A11 Radio. Test for 12-15 V between the antenna cable center terminal and ground at the radio antenna connector.
11. If not within the specified range, replace the A11 Radio.
12. If all circuits test normal, replace the Radio antenna module, K46.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1271 00

Theft Protection Active Malfunction

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 Theft Lock is active.

Recalibration 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.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1278 01

Left Auxiliary Input Signal Circuit Short to Battery

DTC B1278 02

Left Auxiliary Input Signal Circuit Short to Ground

DTC B1279 01

Right Auxiliary Input Signal Circuit Short to Battery

DTC B1279 02

Right Auxiliary Input Signal Circuit Short to Ground

1. Ignition in RUN or ACCESSORY position.
2. The system voltage is between 9.5-15.5 V.

1. The radio detects a short to battery on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
2. The radio detects a short to ground on the auxiliary input 1 signal circuit or auxiliary input 2 signal circuit.
3. All the above conditions are present for greater than 0.25 s.

No audio is heard from the remote audio device.

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

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

CONTROL MODULE REFERENCES for scan tool information

With Multimedia Player Interface Module (KTA/KTB) DTC Set in Radio

1. Ignition OFF, disconnect the harness connector at the multimedia player interface module.
2. Ignition ON, test for less than 1 V between the terminals listed below and ground: Left auxiliary audio signal terminal 14 Right auxiliary audio signal terminal 15 Auxiliary audio common signal terminal 4 Auxiliary audio drain wire terminal 5
3. If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
4. Ignition OFF, test for infinite resistance between the terminals listed below and ground: Left auxiliary audio signal terminal 14 Right auxiliary audio signal terminal 15
5. If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the A11 Radio.
6. If all of the circuits test normal, replace the X92 USB Receptacle.

With Multimedia Player Interface Module (KTA/KTB) DTC Set in Multimedia Player Interface Module

1. Ignition OFF, disconnect the harness connector at the X92 USB Receptacle.
2. Ignition ON, test for less than 1 V between the terminals listed below and ground: Left auxiliary audio signal terminal 2 Right auxiliary audio signal terminal 4 Auxiliary audio common signal terminal 5
3. If greater than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the multimedia player interface module.
4. Ignition OFF, test for infinite resistance between the terminals listed below and ground: Left auxiliary audio signal terminal 2 Right auxiliary audio signal terminal 4
5. If less than the specified value, test the circuit for a short to ground. If the circuit tests normal, replace the multimedia player interface module.
6. If all of the circuits test normal, replace the X92 USB Receptacle.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1287 01

Amplifier Control Signal Circuit Short to Battery

DTC B1287 02

Amplifier Control Signal Circuit Short to Ground

DTC B1287 04

Amplifier Control Signal Circuit Open

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

1. The radio is in ACCESSORY or RUN power mode.
2. The system voltage is between 9-16 V.

The radio detects a fault on the Amplifier Control circuit 0.4 s after radio activates the Remote Enable circuit.

Radio sets the DTC and continues to output correct state.

1. The condition must be corrected.
2. A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
3. The radio receives the clear code command from the scan tool.

CONTROL MODULE REFERENCES for scan tool information

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1446 03

Backup Battery Circuit, Voltage Lower than Limit

DTC B1447 04

Backup Battery Circuit, Break

B1446 03

1. The ignition must be in the DRIVE or ACCESSORY position.
2. System voltage is between 9.5 V and 15.5 V.
3. DTC B1447 has not been set.

B1447 04

1. The ignition must be in the DRIVE or ACCESSORY position.
2. System voltage is between 9.5 V and 15.5 V.
3. All of the above conditions occur for more than 10 seconds.

B1446 03

The telematics control module of the communication interface detects that the voltage of the backup battery is lower than the limit value.

B1447 04

The telematics control module of the communication interface detects no voltage from the backup battery.

B1446 03

1. OnStar® status LED turns red.

B1447 04

1. OnStar® status LED turns red.
2. The telematics control module of the communication interface will not be able to handle calls if the main battery has been disabled in a collision.

1. DTC B1446 is cleared when the telematics control module of the communication interface detects that the backup battery voltage is above the limit value.
2. DTC B1447 is cleared when the telematics control module of the communication interface detects voltage from the backup battery.
3. An old DTC is cleared after 50 fault-free ignition cycles.

1. A short-circuit of the backup batteries positive and negative terminals/chassis ground will activate internal backup battery protection that renders the backup battery inoperable.
2. DTC B1447 can be set if the telematics control module of the communication interface is incorrectly removed or maintained. When removing the telematics K73 telematics control module of the communication interface, always disconnect X1 connector first and then the other connectors. The purpose of this is to retain voltage in the backup battery when voltage is taken from K73 telematics control module of the communication interface.

1. Ignition OFF, disconnect connector X1 from K73 telematics control module of the communication interface.
2. Measure the voltage between pin 13 and pin 14. The voltage should be higher than 15.5 V.
3. If the voltage is lower than 15.5 V, test B+ and the low reference circuit for break/high resistance, short to ground or short to battery. If the circuit test is normal, replace the backup battery.
4. If all tests are normal, replace K73 telematics control module of the communication interface.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC U1804 00

No Communication with ISRVM

1. Ignition ON.
2. The battery voltage must be between 9 and 16 V.

DTC U1804

The telematics control module of the communication interface has no contact with the interior rearview mirror (ISRVM).

Actions Taken When the DTC Sets

1. OnStar® status LED turns red.
2. It is then not possible to make calls.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, detach the wiring harness connector at the interior rearview mirror.
2. Check whether resistance is less than 5 ohms between the mirror ground circuit connection 5 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between voltage supply connection 10 and ground.
5. If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuit fuse is open, test the circuit for a short to ground. If the circuit tests normal, replace the applicable control module.
6. With the ignition OFF, test for 450-900 ohms between the telematics keypad signal circuit connection 3 and ground.
7. If the value is less than the specified range, test whether there is a short to ground in telematics keypad signal circuit S51. If the circuit tests normal, replace the telematics control module for the communication interface K73.
8. If the value is greater than the specified range, test whether there is a break/high resistance in telematics keypad signal circuit S51. If the circuit tests normal, replace the telematics control module for the communication interface K73.
9. With the ignition ON, test for 9.5-10.5 V between S51 telematics keypad supply voltage circuit connection 4 and ground.
10. If the value is less than the specified value, test the supply voltage circuit for a short to ground or a break/high resistance. If the circuit tests normal, replace the telematics control module for the communication interface K73.
11. If the value is greater than the specified range, check the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the telematics control module for the communication interface K73.
12. If all circuits test normal, test or replace the keypad.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2455 02

Mobile Telephone, Microphone Circuit Shorted to Ground

DTC B2455 04

Mobile Telephone, Microphone Circuit Open

1. The ignition must be in the DRIVE or ACCESSORY position.
2. System voltage is min. 9.5 V and max. 15.5 V.
3. All of the above conditions occur for more than 10 seconds.

1. The telematics control module for the communication interface registered a break, a short to ground or to voltage in the mobile telephone microphone signal circuit for 10 seconds or more.
2. The telematics control module for the communication interface registers a break/high resistance in the low reference circuit for 10 seconds or more.

1. OnStar® status LED turns red.
2. The telematics control module for the communication interface does not receive any signal from the mobile telephone microphone.
3. Calls can be connected, but the person called cannot be heard.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, detach the wiring harness connector at the mobile telephone microphone B24.
2. Switch off the ignition and disconnect the scan tool, wait 2 minutes and test whether there is less than 10 ohms between the low reference circuit terminal 1 or A (depending on the car) and ground and give it up to 5 minutes to allow circuit resistance time to drop to its lowest value.
3. If greater than the specified range, test the circuit for an open/high resistance.
4. Switch on the ignition and check that there is 9.5-10.5 V between signal circuit terminal 2 or B (depending on the car) and ground.
5. If the value is less than the specified value, test the circuit for a short to ground or an open circuit/high resistance. If the circuit tests normal, replace the telematics control module for the communication interface K73.
6. If the value is higher than the specified range, test the circuit for a short to plus. If the circuit tests normal, replace the telematics control module for the communication interface K73.
7. If the circuit tests normal, replace the mobile telephone microphone B24.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2462 01

Global Positioning System Short to Battery

DTC B2462 02

Global Positioning System Short to Ground

DTC B2462 04

Global Positioning System Open

B2462 01

The telematics communication interface control module and/or the navigation radio detect a short to B+ on the GPS antenna signal circuit.

B2462 02

The telematics communication interface control module and/or the navigation radio detect a short to ground on the GPS antenna signal circuit.

B2462 04

The telematics communication interface control module and/or the navigation radio detect an open/high resistance on the GPS antenna signal circuit.

Onstar - Telematics Communication Interface Control Module

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

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

CONTROL MODULE REFERENCES for scan tool information

Component Testing

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

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

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2470 02

Mobile Telephone Antenna Circuit Short to Ground

DTC B2470 04

Mobile Telephone Antenna Circuit Break

1. The ignition is in the DRIVE or ACCESSORY position.
2. System voltage is between 9.5 V and 15.5 V.
3. The above conditions occur for more than 1 second.

The telematics control module for the communication interface does not detect the presence of a mobile telephone antenna.

1. The car cannot connect to OnStar® Call Center.
2. OnStar® status LED turns red.

1. The telematics control module for the communication interface detects the presence of a mobile telephone antenna.
2. An old DTC is cleared after 50 fault-free ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. With the ignition OFF, disconnect the antenna coaxial cable from the mobile telephone antenna T4G.
2. With the ignition ON, test whether there is less than 1 V between the center pin of the antenna coaxial cable and ground.
3. If the value is above the specified voltage limit, replace the coaxial cable.
4. With the ignition ON, test whether there is less than 1 V between the antenna coaxial cable outer shield and ground.
5. If the value is above the specified voltage limit, replace the coaxial cable.
6. Test for infinite resistance between the coaxial center terminal of the antenna and ground.
7. If the value is less than the specified value, replace the coaxial cable.
8. Test for infinite resistance between the antenna coaxial cable outer shield and ground.
9. If the value is less than the specified value, replace the coaxial cable.
10. Test that resistance is less than 5 ohms at the center conductor for the mobile telephone antenna from end to end.
11. If the value is above the specified value, replace the antenna coaxial cable.
12. Test that resistance is less than 5 ohms at the coaxial cable outer shield for the mobile telephone antenna from end to end.
13. If the value is above the specified value, replace the antenna coaxial cable.
14. Test for infinite resistance between the antenna coaxial cable center conductor and the outer shield.
15. If the value is less than the specified value, replace the antenna coaxial cable.
16. If the coaxial cable tests normal, replace the mobile telephone antenna T4G.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2476 04

Cellular Phone Select Service Switch Open Circuit

DTC B2476 59

Cellular Phone Select Service Switch Stuck Button

DTC B2482 00

Cellular Phone Select Service Switch Range/Performance

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

B2476 04

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

B2482 and B2476 59

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

1. The OnStar® status LED turns red.
2. No calls can be placed.
3. The telematics communication interface control module will ignore all inputs from the OnStar® button assembly.

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

CONTROL MODULE REFERENCES for scan tool information.

1. Ignition OFF, disconnect the harness connector at the «INSIDE REARVIEW MIRROR»(ref-653668-S17924096972014090100000) .
2. Test for less than 5 ohms between the mirror ground circuit terminal 5 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for less than 1 V between the S51 Telematics Button Assembly signal circuit terminal 3 and ground.
5. If the value is greater than the specified range, check if there is a short-circuit to voltage in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
6. Ignition OFF, test for 450-850 kohms between the S51 Telematics Button Assembly signal circuit terminal 3 and ground.
7. If the value is less than the specified range, check if there is a short-circuit to ground in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
8. If the value is greater than the specified range, check if there is an open circuit/high resistance in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
9. Ignition ON, test for 9.5-10.5 V between the S51 Telematics Button Assembly supply voltage circuit terminal 4 and ground.
10. 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 K73 telematics communication interface control module.
11. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
12. If all circuits test normal, test or replace the button assembly.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2485 02

Wireless Communication, Antenna Circuit Shorted to Ground

DTC B2485 04

Wireless Communication Antenna Circuit Break

1. Ignition ON.
2. The battery voltage must be between 9 and 16 V.
3. The control module for the communication interface tests the antenna every other second.

DTC B2485 02

The control module registers a short to ground in the Bluetooth® antenna circuit.

DTC B2485 04

The control module registers a break in the Bluetooth® antenna circuit.

1. Bluetooth® functionality is deactivated.

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

CONTROL MODULE REFERENCES for scan tool information

1. Check that the Bluetooth® antenna is correctly connected to the mobile telephone control module K82 and is not damaged.
2. If the antenna is disconnected or damaged, repair or replace if necessary.
3. With the ignition ON, confirm that DTC B2485 has not been set.
4. If the DTC is present, replace the Bluetooth® antenna. Delete the DTC and switch the ignition OFF and then ON again. If the DTC is set again, replace the mobile telephone control module K82.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B2485 02

Wireless Communication, Antenna Circuit Shorted to Ground

DTC B2485 04

Wireless Communication Antenna Circuit Break

1. Ignition ON.
2. The battery voltage must be between 9 and 16 V.
3. The telematics control module for the communication interface tests the antenna every other second.

DTC B2485 02

The control module registers a short to ground in the Bluetooth® antenna circuit.

DTC B2485 04

The control module registers a break in the Bluetooth® antenna circuit.

1. OnStar® status LED turns red.
2. Bluetooth® functionality is deactivated.

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

CONTROL MODULE REFERENCES for scan tool information

1. Check that the Bluetooth® antenna is correctly connected to the telematics control module for the communication interface K73 and is not damaged.
2. If the antenna is disconnected or damaged, repair or replace if necessary.
3. With the ignition ON, confirm that DTC B2485 has not been set.
4. If the DTC is present, replace the Bluetooth® antenna. Delete the DTC and switch the ignition OFF and then ON again. If the DTC is set again, replace the telematics control module for the communication interface K73.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1405 03

Control Module Voltage Reference Output 2 Circuit Low Voltage

DTC B1405 07

Control Module Voltage Reference Output 2 Circuit High Voltage

1. Battery voltage is between 9-16 V.
2. The ignition is ON.

The BCM detects a low/high voltage on the control circuit.

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

CONTROL MODULE REFERENCES

1. Ignition OFF, disconnect the X2 and the X1 harness connector at the K9 Body Control Module.
2. Test for less than 5 ohms between the X2 harness connector ground circuit terminal 2 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Test for less than 5 ohms between the X1 harness connector ground circuit terminal 1 and ground.
5. If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, test for more than 11 V between the X2 harness connector terminal 1 and ground.
7. If less than the specified value test the control circuit for an open/high resistance.
8. If all circuits test normal, replace the K9 Body Control Module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B1529 03

Control Module Voltage Reference Output 5 Circuit Low Voltage

DTC B1529 07

Control Module Voltage Reference Output 5 Circuit High Voltage

1. The system voltage is between 9-16 V.
2. The ignition is ON.

B1529 03

1. The BCM detects a short to ground in the 12 V reference circuit.
2. The above condition is present for greater than 30 s.

B1529 07

1. The BCM detects a short to voltage in the 12 V reference circuit.
2. The above condition is present for greater than 30 seconds.

The BCM will ignore switch inputs.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X3 harness connector at the X85 Steering Wheel Air Bag Coil.
2. Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and ground.
3. If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and the signal circuit terminal 7 X3 male side.
5. If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
6. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
7. Test for infinite resistance between the signal circuit terminal 7 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
8. If less than the specified value, test the signal circuit for a short to ground.
9. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.

Static Test

1. Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
2. Test the resistance between the terminals 6 X3 female side and 7 X3 female side of the X85 Steering Wheel Air Bag Coil.
3. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

DTC B3622 07

Steering Wheel Controls Signal Circuit High Voltage

1. Battery voltage is between 9-16 V.
2. The ignition is ON.

The BCM detects a short to voltage in the steering wheel control switch signal circuit.

The BCM will ignore switch inputs.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X3 harness connector at the X85 Steering Wheel Air Bag Coil.
2. Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and ground.
3. If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and the signal circuit terminal 7 X3 male side.
5. If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
6. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
7. Test for infinite resistance between the signal circuit terminal 7 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
8. If less than the specified value, test the signal circuit for a short to ground.
9. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.

1. Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
2. Test the resistance between the terminals 6 X3 female side and 7 X3 female side of the X85 Steering Wheel Air Bag Coil.
3. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. See «CHECKING AFTERMARKET ACCESSORIES»(ref-653659-S25218301212014090100000)
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

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

1. «BLUETOOTH MALFUNCTION»(ref-653672-S37740152852014090100000)
2. «ONSTAR GLOBAL POSITIONING SYSTEM (GPS) DATA NOT CURRENT OR INACCURATE»(ref-653672-S36230886132014090100000)
3. «ONSTAR MICROPHONE MALFUNCTION»(ref-653672-S16569571572014090100000)
4. «ONSTAR AUDIO MALFUNCTION»(ref-653672-S21630264902014090100000)
5. «ONSTAR BUTTON LED MALFUNCTION»(ref-653672-S01167336962014090100000)
6. «ONSTAR CALL CENTER REMOTE FUNCTION REQUESTS MALFUNCTION»(ref-653672-S06593280712014090100000)
7. «ONSTAR BUTTON MALFUNCTION»(ref-653672-S36707970362014090100000)
8. «UNABLE TO CONTACT ONSTAR CALL CENTER»(ref-653672-S29365659842014090100000)
9. «ONSTAR VOICE RECOGNITION MALFUNCTION»(ref-653672-S30033512482014090100000)
10. «ONSTAR STEERING WHEEL CONTROL FUNCTIONS MALFUNCTION»(ref-653672-S20550876892014090100000)

Symptoms - Entertainment

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

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to: «RADIO/AUDIO SYSTEM DESCRIPTION AND OPERATION»(ref-653672-S39376120492014090100000) «VIDEO ENTERTAINMENT SYSTEM DESCRIPTION AND OPERATION»(ref-653672-S35867717232014090100000) «CELLULAR TELEPHONE DESCRIPTION AND OPERATION»(ref-653672-S41974965072014090100000) «NAVIGATION SYSTEM DESCRIPTION AND OPERATION»(ref-653672-S39566985192014090100000) «ONSTAR DESCRIPTION AND OPERATION»(ref-653672-S23505001582014090100000)

1. Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. See «CHECKING AFTERMARKET ACCESSORIES»(ref-653659-S25218301212014090100000)
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

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

1. «SPEAKER MALFUNCTION»(ref-653672-S28611539052014090100000)
2. «CELLULAR TELEPHONE MICROPHONE MALFUNCTION»(ref-653672-S07581176642014090100000)
3. «WIRELESS COMMUNICATION INTERFACE ANTENNA MALFUNCTION (UHP)»(ref-653672-S40567584642014090100000)
4. «ONSTAR MICROPHONE MALFUNCTION»(ref-653672-S16569571572014090100000)
5. «ONSTAR AUDIO MALFUNCTION»(ref-653672-S21630264902014090100000)
6. «ONSTAR BUTTON LED MALFUNCTION»(ref-653672-S01167336962014090100000)
7. «ONSTAR CALL CENTER REMOTE FUNCTION REQUESTS MALFUNCTION»(ref-653672-S06593280712014090100000)
8. «ONSTAR BUTTON MALFUNCTION»(ref-653672-S36707970362014090100000)
9. «ONSTAR STEERING WHEEL CONTROL FUNCTIONS MALFUNCTION»(ref-653672-S20550876892014090100000)
10. «ONSTAR VOICE RECOGNITION MALFUNCTION»(ref-653672-S30033512482014090100000)
11. «BLUETOOTH MALFUNCTION»(ref-653672-S37740152852014090100000)
12. «CELLULAR TELEPHONE CHARGING MALFUNCTION»(ref-653672-S41912015772014090100000)
13. «VIDEO ENTERTAINMENT SYSTEM MALFUNCTION»(ref-653672-S13298844952014090100000)
14. «VIDEO ENTERTAINMENT SYSTEM WIRELESS HEADPHONE MALFUNCTION»(ref-653672-S30615708862014090100000)
15. «VIDEO ENTERTAINMENT SYSTEM REMOTE CONTROL MALFUNCTION»(ref-653672-S21400290462014090100000)

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. The purpose of this diagnostic is to verify the ability of the mobile telephone control module to pair to a Bluetooth device.
2. If a 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.
3. 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.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.
2. Ignition OFF, wait until all retained accessory power is OFF, test for less than 10 ohms between the low reference circuit terminal 1 or A (depending on vehicle) and ground, allowing up to 5 minutes for the circuit resistance to drop to its lowest reading.
3. If greater than the specified range, test the circuit for an open/high resistance.
4. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal 2 or B (depending on vehicle) and ground.
5. If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.
6. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K82 mobile telephone control module.
7. If all circuits test normal, replace the B24 cellular phone microphone.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Note. You must perform the circuit/system verification before proceeding with circuit/system testing.

1. Ignition OFF, disconnect the X1 connector at the K82 Mobile Telephone Control Module and the X1 connector at the A11 Radio.
2. Ignition ON, test for less than 0.3 V between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and ground.
3. If greater than the specified range, test the audio signal circuit for a short to voltage.
4. Ignition ON, test for less than 0.3 V between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and ground.
5. If greater than the specified range, test the audio signal circuit for a short to voltage.
6. Test for infinite resistance between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and ground.
7. If less than the specified range, test the audio signal circuit for a short to ground.
8. Test for infinite resistance between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and ground.
9. If less than the specified range, test the audio signal circuit for a short to ground.
10. Test for less than 5 ohms between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and the audio signal circuit terminal 20 X1 at the A11 Radio.
11. If greater than the specified range, test the audio signal circuit for an open circuit/high resistance.
12. Test for less than 5 ohms between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and the audio signal circuit terminal 6 X1 at the A11 Radio.
13. If greater than the specified range, test the audio signal circuit for an open circuit/high resistance.
14. Test for infinite resistance between the shield ground circuit terminal 5 X1 at the K82 Mobile Telephone Control Module and audio signal circuit terminal 6 X1 and the audio signal circuit terminal 15 X1.
15. If less than the specified range, test short circuit between each signal circuit and the shield ground circuit.
16. If all circuits test normal, replace the K82 Mobile Telephone Control Module and verify that the customer concern is not still present.
17. If the customer concern is still present, replace the A11 Radio.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Note. You must perform the circuit/system verification before proceeding with circuit/system testing.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

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

CONTROL MODULE REFERENCES for scan tool information

1. Disconnect the cellular phone and navigation antenna coax cable from the K73 telematics communication interface control module.
2. Ignition ON, test for 4.5-5.5 V between the K73 telematics communication interface control module coax cable center conductor terminal at the module and ground.
3. If not within the specified range, replace the K73 telematics communication interface control module.
4. Reconnect the coax cable to the telematics communication interface control module. Disconnect the coax cable from the T4 cellular phone and navigation antenna.
5. Test for 4.5-5.5 V between the coax cable center conductor and the outer shield.
6. If not within the specified range, replace the coax cable.
7. If all circuits test normal, replace the T4 cellular phone and navigation antenna.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.
2. Test for less than 10 ohms between the low reference circuit terminal A and ground.
3. If greater than the specified range, test the circuit for an open/high resistance.
4. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.
5. If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.
6. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
7. If all circuit test normal, replace the B24 cellular phone microphone.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the radio.
2. Ignition ON, test for a varying AC voltage between the following signal circuit terminals listed below and ground when the OnStar® Call Center button is pressed. Audio Signal Circuit - terminal 20 Audio Common Circuit - terminal 6
3. 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 K73 telematics communication interface control module.
4. If all circuits test normal, replace the radio.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Note. The global positioning system requires a clear line of sight to the sky to operate properly. In most cases the GPS will not have reception near tall buildings or inside structures.

1. Ignition OFF, disconnect the global positioning system antenna coax cable from the A11 Radio.
2. Ignition ON, test for 4.5-5.5 V between the GPS coax cable connection center conductor.
3. If not within the specified range, replace the A11 Radio.
4. If all circuits test normal, replace the T4E Cellular Phone and Navigation Antenna.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

Circuit Description

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the A10 inside rear view mirror.
2. Doors closed, courtesy lamps OFF, test for less than 10 ohms between the ground circuit terminal 5 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, command the green LED OFF with a scan tool. Test for less than 1 V between the control circuit terminal 6 and ground.
5. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
6. Command the green LED ON with a scan tool. Test for greater than 9 V between the control circuit terminal 6 and ground.
7. 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 K73 telematics communication interface control module.
8. Command the red LED OFF with a scan tool. Test for less than 1 V between the control circuit terminal 7 and ground.
9. If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
10. Command the red LED ON with a scan tool. Test for greater than 9 V between the control circuit terminal 7 and ground.
11. 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 K73 telematics communication interface control module.
12. If all circuits test normal, replace the A10 inside rear view mirror.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

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.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the «INSIDE REARVIEW MIRROR»(ref-653668-S17924096972014090100000) .
2. Test for less than 5 ohms between the mirror ground circuit terminal 5 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, test for less than 1 V between the S51 Telematics Button Assembly signal circuit terminal 3 and ground.
5. If the value is greater than the specified range, check if there is a short-circuit to voltage in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
6. Ignition OFF, test for 450-850 kohms between the S51 Telematics Button Assembly signal circuit terminal 3 and ground.
7. If the value is less than the specified range, check if there is a short-circuit to ground in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
8. If the value is greater than the specified range, check if there is an open circuit/high resistance in the S51 signal circuit of the Telematics keypad. If the circuit test result is normal, replace the K73 telematics communication interface control module.
9. Ignition ON, test for 9.5-10.5 V between the S51 Telematics Button Assembly supply voltage circuit terminal 4 and ground.
10. 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 K73 telematics communication interface control module.
11. If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the K73 telematics communication interface control module.
12. If all circuits test normal, test or replace the button assembly.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. The purpose of this diagnostic is to verify the ability of the Mobile Telephone Control Module to pair to a wireless communication interface device.
2. Before performing this test, verify compatibility of the cellular telephone the customer is attempting to use with the vehicle. Based on the cellular phone and the manufacturer's implementation of Bluetooth ®, not all phones support all available wireless communication interface functionality.
3. If a vehicle passes the following tests and a compatible device is being used, the concern may be due to a device malfunction or an incomplete/improper pairing attempt.
4. A wireless communication interface test tool or equivalent can also be used to verify the ability of the customers cellular phones to pair with another device.

CONTROL MODULE REFERENCES for scan tool information

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

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.

CONTROL MODULE REFERENCES for scan tool information

Antenna Circuit Testing

1. Ignition OFF, disconnect the radio antenna coax cable from the radio and the Radio antenna amplifier, K46.
2. Test for infinite resistance between the coaxial center terminal of the antenna and ground. If the value is less than the specified value, replace the coaxial cable.
3. Test for less than 10 ohms on the antenna coax center terminal from end to end. If the value is above the specified voltage limit, replace the coaxial cable.
4. Test for less than 10 ohms on the antenna coax outer shield from end to end. If the value is above the specified voltage limit, replace the coaxial cable.
5. Test for infinite resistance between the coax center terminal and the outer shield. If the value is less than the specified value, replace the coaxial cable.
6. Reconnect the coax to the radio antenna. Test for infinite resistance on the coax at the radio between the center terminal and the outer shield. If less then specified value, replace the Radio antenna amplifier, K46.
7. Test for less than 10 ohms on the coax at the radio between the outer shield and ground. If greater than specified value, clean the mounting surface of the antenna ground plane. If no corrosion is detected, replace Radio antenna amplifier, K46.
8. If all circuits test normal, replace the radio, A11.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Improper speaker mounting or loose trim may cause an audible buzz or distortion. Inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.
2. When equipped with an amplifier, it is possible for some individual circuit faults to affect more than one speakers operation. Perform diagnostic tests in the sequence listed to avoid misdiagnosis.
3. The amplifier control circuit has less than 1 V when the mute function is OFF, and will have 4-6 V DC when at full mute.

CONTROL MODULE REFERENCES for scan tool information

Note. If equipped with surround sound, the surround sound should be turned OFF for proper voltage values when performing speaker testing.

Speaker Malfunction Radio Output Testing - UQA

1. Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
2. Radio ON, test for 4-8 V between the signal circuit terminal listed below and ground. Left front low level audio control (+) terminal 9 X3 Left front low level audio control (-) terminal 1 X3 Right front low level audio control (+) terminal 10 X3 Right front low level audio control (-) terminal 2 X3 Left rear low level audio control (+) terminal 11 X3 Left rear low level audio control (-)- terminal 3 X3 Right rear low level audio control (+) terminal 12 X3 Right rear low level audio control (-) terminal 4 X3
3. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
4. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
5. If all circuits test normal, replace the T3 Audio Amplifier.

Speaker Malfunction Radio Output Testing - UQS

1. Ignition OFF, disconnect the X3 harness connector at the T3 Audio Amplifier.
2. Radio ON, test for 1-8 V between the signal circuit terminal listed below and ground. Left front low level audio control (+) terminal 9 X3 Left front low level audio control (-) terminal 1 X3 Right front low level audio control (+) terminal 10 X3 Right front low level audio control (-) terminal 2 X3 Left rear low level audio control (+) terminal 11 X3 Left rear low level audio control (-)- terminal 3 X3 Right rear low level audio control (+) terminal 12 X3 Right rear low level audio control (-) terminal 4 X3 Center low level audio control (+) terminal 7 X3 Center low level audio control (-) terminal 15 X3 Subwoofer low level audio control (+) terminal 8 X3 Subwoofer low level audio control (-) terminal 16 X3
3. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
4. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
5. If all circuits test normal, replace the T3 Audio Amplifier.

Speaker Malfunction Amplifier Output Testing - UQA

1. Ignition OFF, disconnect the X1 and X2 connectors at the T3 Audio Amplifier.
2. Radio ON, test for less than 1 V between the signal circuit terminal listed below and ground: Left front speaker output (+) terminal 10 X2 Left front speaker output (-) terminal 2 X2 Right front speaker output (+) terminal 11 X2 Right front speaker output (-) terminal 3 X2 Left rear speaker output (+) terminal 12 X2 Left rear speaker output (-) terminal 4 X2 Right rear speaker output (+) terminal 13 X2 Right rear speaker output (-)- terminal 5 X2 Front center speaker output (+) terminal 14 X2 Front center speaker output (-) terminal 6 X2 Rear subwoofer speaker output (+) terminal 6 X1 Rear subwoofer speaker output (-) terminal 2 X1 Rear subwoofer speaker output (+) terminal 7 X1 Rear subwoofer speaker output (-) terminal 3 X1
3. If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
4. Radio ON, test for infinite resistance between the signal circuit terminal listed below and ground: Left front speaker output (+) terminal 10 X2 Left front speaker output (-) terminal 2 X2 Right front speaker output (+) terminal 11 X2 Right front speaker output (-) terminal 3 X2 Left rear speaker output (+) terminal 12 X2 Left rear speaker output (-) terminal 4 X2 Right rear speaker output (+) terminal 13 X2 Right rear speaker output (-)- terminal 5 X2 Front center speaker output (+) terminal 14 X2 Front center speaker output (-) terminal 6 X2 Rear subwoofer speaker output (+) terminal 6 X1 Rear subwoofer speaker output (-) terminal 2 X1 Rear subwoofer speaker output (+) terminal 7 X1 Rear subwoofer speaker output (-) terminal 3 X1
5. If less than the specified value, test both circuits of the affected speaker for a short to ground.
6. If all circuits test normal, reconnect all harness connectors at the T3 Audio Amplifier.
7. Ignition ON, radio ON, disconnect the speaker.
8. Test for 4-8 V between the signal circuit terminals and ground.
9. If less than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the T3 Audio Amplifier.
10. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the T3 Audio Amplifier.
11. If the circuit tests normal, replace the speaker.

Speaker Malfunction Amplifier Output Testing - UQS

1. Ignition OFF, disconnect the X1 and X2 connectors at the T3 Audio Amplifier.
2. Radio ON, test for less than 1 V between the signal circuit terminal listed below and ground: Left front speaker output (+) terminal 10 X2 Left front speaker output (-) terminal 2 X2 Right front speaker output (+) terminal 11 X2 Right front speaker output (-) terminal 3 X2 Left rear speaker output (+) terminal 4 X2 Left rear speaker output (-) terminal 12 X2 Right rear speaker output (+) terminal 5 X2 Right rear speaker output (-) terminal 13 X2 Front center speaker output (+) terminal 14 X2 Front center speaker output (-) terminal 6 X2 Rear subwoofer speaker output (+) terminal 3 X1 Rear subwoofer speaker output (-) terminal 7 X1 Rear subwoofer speaker output (+) terminal 2 X1 Rear subwoofer speaker output (-) terminal 6 X1 Left surround speaker output (+) terminal 15 X2 Right surround speaker output (-) terminal 7 X2
3. If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
4. Radio ON, test for infinite resistance between the signal circuit terminal listed below and ground: Left front speaker output (+) terminal 10 X2 Left front speaker output (-) terminal 2 X2 Right front speaker output (+) terminal 11 X2 Right front speaker output (-) terminal 3 X2 Left rear speaker output (+) terminal 4 X2 Left rear speaker output (-) terminal 12 X2 Right rear speaker output (+) terminal 5 X2 Right rear speaker output (-) terminal 13 X2 Front center speaker output (+) terminal 14 X2 Front center speaker output (-) terminal 6 X2 Rear subwoofer speaker output (+) terminal 3 X1 Rear subwoofer speaker output (-) terminal 7 X1 Rear subwoofer speaker output (+) terminal 2 X1 Rear subwoofer speaker output (-) terminal 6 X1 Left surround speaker output (+) terminal 15 X2 Right surround speaker output (-) terminal 7 X2
5. If less than the specified value, test both circuits of the affected speaker for a short to ground.
6. If all circuits test normal, reconnect all harness connectors at the T3 Audio Amplifier.
7. Ignition OFF, disconnect the speaker.
8. Radio ON, test for 4-8 V between the signal circuit terminals and ground.
9. If less than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the T3 Audio Amplifier.
10. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the T3 Audio Amplifier.
11. If the circuit tests normal, replace the speaker.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

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

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect both the GPS and cell coax cable connectors at the K73 telematics communication interface control module.
2. Connect EL-49903 to the Telematics control module for communication interface K73, place the test antenna on the roof of the vehicle.
3. 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.
4. 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.
5. Request the consultant to verify the vehicle location to confirm the GPS system is functioning.
6. If the OnStar GPS does not function, replace the K73 telematics communication interface module.
7. Ignition OFF, perform the coax cable test on the coax cable, refer to «COMPONENT TESTING»(ref-653672-S31877921152014090100000) . The coax cable should pass the test.
8. If the coax cable does not pass the test, replace the coax cable.
9. If all circuits test normal, replace the T4 cellular phone and navigation antenna.

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.

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

1. Perform «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. With the ignition OFF, detach the wiring harness contact from the relevant DVD screen.
2. With the ignition OFF for two minutes, test whether there is less than 5 ohms between the ground circuit connections (see list below) and ground. Ground Connection 8 Ground Connection 14
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Check that a test lamp lights between B+ circuit pin 1 and ground.
5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. With the ignition ON, connect a test lamp between control circuit contact pin 2 and ground.
7. Play a DVD, activate/deactivate double screens on the radio display. The test lamp should light and go out when double screens are activated/deactivated.
8. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the radio.
9. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
10. Play a DVD and test whether there is 1-6 V between video brightness control connection 16 and ground.
11. If greater than specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
12. If less than the specified range, test the control circuit for a short to ground or an open circuit/high resistance. If the circuit tests normal, replace the radio.
13. While the DVD plays, command video mode to normal and test whether there is 1-2 V between video mode signal circuit connection 15 and ground.
14. If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
15. If less than specified range, test the signal circuit for a short to ground, or an open circuit/high resistance. If the circuit tests normal, replace the radio.
16. While the DVD plays, test whether there is 1-3 V between the control circuit connections (see list below) and ground. Video Signal (+) Connection 9 Video Signal (-) Connection 10
17. If greater than specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the radio.
18. If less than the specified range, test the control circuit for a short to ground or an open circuit/high resistance. If the circuit tests normal, replace the radio.
19. If all circuits test normal, replace the DVD screen.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connectors at both left and right DVD display seat headrests.
2. Ignition OFF, scan tool disconnected, open driver door, wait two minutes. Test for less than 1 ohms between the infrared remote signal (-) circuits terminal 13 and ground.
3. If greater than the specified range, test the signal (-) circuit for an open/high resistance. If the circuits test normal, replace the A11 Radio.
4. Ignition ON, DVD playing, test for 1-4 V between the infrared remote signal (+) circuit terminal 12 and ground.
5. If less than specified range, test the signal (+) circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the A11 Radio.
6. If greater than specified range, test the signal (+) circuit for a short to voltage. If the circuit tests normal, replace the A11 Radio.
7. If all circuits test normal, replace the remote control. If the remote is still inoperative, replace the DVD display seat headrest.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the left DVD display seat headrest.
2. Ignition OFF, scan tool disconnected, open driver door, wait five minutes, test for 20-25 ohms between the DVD audio low reference signal (-) circuits terminal 5 and ground.
3. If greater than the specified range, test the low reference (-) circuit for an open/high resistance. If the circuits test normal, replace the A11 Radio.
4. Ignition ON, DVD playing with audio present, test for a varying voltage greater than 50 mV from 10-250 mV between the control circuits listed below and ground: Left DVD audio control (+) circuit terminal 6 Right DVD audio control (-) circuit terminal 7
5. If not within specified interval, test the control circuit for short to voltage, short to ground, or an open circuit/high resistance. If the circuits test normal, replace radio A11.
6. If all circuits test normal, replace the headphones. If the headphones are still inoperative, replace the left DVD display seat headrest.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. Inspect for aftermarket devices which could affect the operation of the steering wheel controls. See «CHECKING AFTERMARKET ACCESSORIES»(ref-653659-S25218301212014090100000)
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

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

Refer to STEERING WHEEL CONTROLS MALFUNCTION in order to diagnose the symptom.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-653639-S05362277832014090100000) prior to using this diagnostic procedure.
2. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-653639-S39457439302014090100000) provides an overview of each diagnostic category.

1. This diagnostic is for the audio steering wheel controls.
2. Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.
3. If a single switch function is inoperative, test the suspect switch. Refer to «COMPONENT TESTING»(ref-653672-S00548751082014090100000) .

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the X85 Steering Wheel Air Bag Coil.
2. Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 5 X1 male side and ground.
3. If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
4. Test for greater than 11 V between the voltage reference circuit terminal 5 X1 male side and the signal circuit terminal 4 X1 male side.
5. If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
6. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
7. Test for infinite resistance between the signal circuit terminal 52 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
8. If less than the specified value, test the signal circuit for a short to ground.
9. If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.

1. Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
2. Test the resistance between the terminals 5 X1 female side and 4 X1 female side of the X85 Steering Wheel Air Bag Coil.
3. If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.