B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER

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

When Monitored:
With the ignition on. Radio volume at 25 or higher.
Set Condition:
The amplifier detects that the output circuits are shorted together.

Possible Causes
(X205) LEFT REAR SPEAKER (+) CIRCUIT SHORTED TO THE (X295) LEFT REAR SPEAKER (-) CIRCUIT
LEFT REAR SPEAKER
AMPLIFIER

1. CHECK FOR AN INTERMITTENT CONDITION

1.	Turn the ignition on.

2.	Using the scan tool, record and erase the Amplifier DTCs.

3.	Cycle the ignition switch from on to off, wait five seconds and then back to on.

4.	Turn the Radio on and set the volume to 25.

5.	Adjust the speakers to the rear and center.

6.	Using the scan tool, read the active Amplifier DTCs.

Does the scan tool display active: B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER?

Yes

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. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

2. CHECK THE OPERATION OF THE LEFT REAR SPEAKER

1.	Using the scan tool, erase the DTCs.

2.	Turn the ignition off.

3.	Disconnect the Left Rear Speaker harness connector from the Left Rear Speaker.

4.	Turn the ignition on.

5.	Turn the radio on and set the volume to 25.

6.	Using the scan tool, read the active Amplifier DTCs.

Does the scan tool display active: B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER?

No

Replace the Left Rear Speaker in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Yes

3. CHECK THE (X205) LEFT REAR SPEAKER (+) CIRCUIT AND THE (X295) LEFT REAR SPEAKER (-) CIRCUIT FOR A SHORT TOGETHER

1.	Turn the ignition off.

2.	Disconnect the Amplifier C2 harness connector.

3.	Measure the resistance between the (X205) Left Rear Speaker (+) circuit and the (X295) Left Rear Speaker (-) circuit.

Is the resistance below 10K Ohms?

Yes

Repair the (X205) Left Rear Speaker (+) circuit for a short to the (X295) Left Rear Speaker (-) circuit.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).

Replace the Amplifier in accordance with the Service Information.
Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).