Base

B1408-12-REAR LEFT AUDIO SPEAKER OUTPUT - CIRCUIT SHORT TO BATTERY - BASE





For a complete wiring diagram, refer to the Wiring Information.

NOTE: There are two versions of the B1408-12 DTC test. In order to select the proper test you must know if the vehicle is equipped with an Amplifier. If the vehicle is equipped with an Amplifier use the B1408-12-PREMIUM test. If the vehicle is not equipped with an Amplifier use the B1408-12-BASE test.

Theory of Operation

The (X303) Left Rear Speaker (+) circuit and the (X393) Left Rear Speaker (-) circuit are outputs of the Telematics Gateway (TGW). The TGW controls and monitors these circuits for a concern.

For a detailed description of the Audio System. Audio And Video - Description.

For additional information regarding the operation of the Audio System. Audio And Video - Operation.

- When Monitored:
With the ignition on.

- Set Condition:
The TGW detects a short to battery condition on the speaker output circuit.





1. CHECK FOR AN INTERMITTENT CONDITION

NOTE: A front door must remain open whenever checking or erasing TGW DTCs.

1. Using the scan tool, record and erase the TGW DTCs.
2. Cycle the ignition switch from on to off, wait five seconds and then back to on.
3. Turn the radio on and set the volume to 25.
4. Adjust the speakers to the Rear and center.
5. Using the scan tool, read the active TGW DTCs.

Does the scan tool display active: B1408-12-REAR LEFT AUDIO SPEAKER OUTPUT - CIRCUIT SHORT TO BATTERY?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR VOLTAGE ON THE (X303) LEFT REAR SPEAKER (+) CIRCUIT




1. Turn the ignition off.
2. Disconnect the TGW harness connector.
3. Disconnect the Left Rear Speaker harness connector.
4. Turn the ignition on.
5. Measure for voltage between the (X303) Left Rear Speaker (+) circuit and ground.

Is there any voltage present?

Yes

- Repair the (X303) Left Rear Speaker (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. CHECK FOR VOLTAGE ON THE (X393) LEFT REAR SPEAKER (-) CIRCUIT




1. Measure for voltage between the (X393) Left Rear Speaker (-) circuit and ground.

Is there any voltage present?

Yes

- Repair the (X393) Left Rear Speaker (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the TGW. Telematics Gateway Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.