Base Audio System

B140C-1A -REAR RIGHT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD- BASE

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





Theory of Operation

NOTE:
There are two versions of the B140C-1A 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 B140C-1A PREMIUM test. If the vehicle is not equipped with an Amplifier use the B140C-1A BASE test.

The Right Rear Speaker (+) circuit and the Right Rear Speaker (-) circuit are outputs of the Radio. The Radio 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 Radio detects that the output circuits are shorted together for greater than 2.5 seconds.





Diagnostic Test

1. CHECK FOR AN INTERMITTENT CONDITION

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

1. Using the scan tool, record and erase the Radio 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 Radio DTCs.

Does the scan tool display active: B140C-1A-REAR RIGHT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD?

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 THE RIGHT REAR SPEAKERS
1. Make sure one of the front doors is still open.
2. Using the scan tool, erase the DTCs.
3. Turn the ignition off.
4. Disconnect the Right Rear Speaker harness connector.
5. Turn the ignition on.
6. Turn the radio on and set the volume to 25.
7. Using the scan tool, read the active Radio DTCs.

Does the scan tool display active: B140C-1A-REAR RIGHT AUDIO SPEAKER OUTPUT - CIRCUIT RESISTANCE BELOW THRESHOLD?

Yes

- Go To 3

No

- Replace the Right Rear Speaker. Speaker - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

3. CHECK THE (X206) RIGHT REAR SPEAKER (+) CIRCUIT, AND THE (X296) RIGHT REAR SPEAKER (-) CIRCUITS FOR A SHORT TOGETHER
1. Disconnect the Radio harness connector.
2. Measure the resistance between the (X206) Right Rear Speaker (+) circuit, and the (X296) Right Rear Speaker (-) circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (X206) Right Rear Speaker (+) circuit, and the (X296) Right Rear Speaker (-) circuit for a short together.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Replace the Radio. Radio - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .