Circuit Description
When the radio is powered up, the radio supplies low level audio signals to the speakers. If the vehicle is equipped with an audio amplifier, the amplifier will boost the signal sent to the speakers.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B1025 Audio Output 1 Circuit |
| • | DTC B1035 Audio Output 2 Circuit |
| • | DTC B1045 Audio Output 3 Circuit |
| • | DTC B1055 Audio Output 4 Circuit |
Conditions for Running the DTC
The test is performed when the radio switches from OFF to ON. The radio will continue to test for the fault once every 0.5 seconds.
Conditions for Setting the DTC
The radio sets a current status for this DTC when a short to ground or voltage is detected on any of the speaker channels for 1.5 seconds.
Action Taken When the DTC Sets
No sound is present from one or more of the speakers.
Conditions for Clearing the DTC
The fault condition is not present for 5 seconds.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Radio/Audio System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
Does the scan tool indicate that DTC B1025, B1035, B1045, or B1055 is current? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | |
Test the speaker outputs from the radio for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 4 | |
4 | Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 6 | Go to Step 5 |
5 | Replace the radio. Refer to Control Module References in Computer/Integrating Systems. Did you complete the replacement? | Go to Step 6 | -- |
6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
