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B140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH - PREMIUM





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

NOTE: There are two versions of the B140A 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 B140A-PREMIUM test. If the vehicle is not equipped with an Amplifier use the B140A-BASE test.

Theory of Operation

The (X51) Left Rear Audio (+) circuit and the (X57) Left Rear Audio (-) circuit are outputs of the Radio. The Radio controls and monitors these circuits for a concern.

- When Monitored:
With the Radio on.

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





1. CHECK FOR AN INTERMITTENT CONDITION
1. Turn the ignition on and open one of the front doors.

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

2. Using the scan tool, record and erase the Radio DTCs.
3. Turn the Radio on.
4. Adjust the speakers to the rear and center.
5. Using the scan tool, read the active Radio DTCs.

Does the scan tool read: B140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH?

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 AMPLIFIER




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 Amplifier harness connector from the Amplifier.
5. Turn the ignition on.
6. Turn the radio on.
7. Using the scan tool, read the active Radio DTCs.

Does the scan tool read: B140A-REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH?

Yes

- Go To 3

No

- Replace the Amplifier.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK FOR VOLTAGE ON THE (X51) LEFT REAR AUDIO (+) CIRCUIT




1. Turn the ignition off.
2. Disconnect the Radio harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (X51) Left Rear Audio (+) circuit.

Is there any voltage present?

Yes

- Repair the (X51) Left Rear Audio (+) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK FOR VOLTAGE ON THE (X57) LEFT REAR AUDIO (-) CIRCUIT




1. Measure the voltage between ground and the (X57) Left Rear Audio (-) circuit.

Is there any voltage present?

Yes

- Repair the (X57) Left Rear Audio (-) circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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