B147F

B147F-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT LOW







- When Monitored:
With the ignition on.

- Set Condition:
The Amplifier detects a shorted to ground condition on the speaker 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 Amplifier DTCs.

2. With the scan tool, record and erase the DTCs.
3. Turn the radio on and set the volume to 25.
4. Adjust the speakers to the rear and center.
5. Adjust the Bass to mid level.
6. With the scan tool, read the DTCs.

Does the scan tool display active: B147F-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT LOW?

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 SUBWOOFER SPEAKER FOR A SHORT TO GROUND




1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Disconnect the Subwoofer Speaker harness connector.
4. Turn the ignition on, engine not running.
5. Turn the radio on with the same settings as in the previous step.
6. With the scan tool, read the active DTCs.

Does the scan tool display active: B147F-CHANNEL 7 AUDIO SPEAKER OUTPUT CIRCUIT LOW?

Yes

- Go To 3

No

- Replace the Subwoofer Speaker.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (X300) AMPLIFIED SUBWOOFER 1 (+) CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Radio Amplifier C2 harness connector.
3. Measure the resistance between ground and the (X300) Amplified Subwoofer 1 (+) circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (X300) Amplified Subwoofer 1 (+) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK THE (X390) AMPLIFIED SUBWOOFER 1 (-) CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (X390) Amplified Subwoofer 1 (-) circuit.

Is the resistance below 10K Ohms?

Yes

- Repair the (X390) Amplified Subwoofer 1 (-) circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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