Diagnostic Test

1) CHECK FOR AN INTERMITTENT CONDITION
Turn the ignition on, then off, and then on again.

With the scan tool, erase Amplifier DTCs

Turn the radio on.

Turn the volume level to 25.

With the scan tool, read Amplifier DTCs.

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

Yes
- Go to Step 2.
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST - VER 1 .
2) CHECK THE OPERATION OF THE AMPLIFIED LEFT REAR SHELF SPEAKER
Disconnect the Amplified Left Rear Shelf Speaker.

Measure the resistance of the speaker between the two terminals.

Is the resistance of the speaker less than 1 ohm?

Yes
- Replace the Amplified Left Rear Shelf Speaker in accordance with the service information.
- Perform the BODY VERIFICATION TEST - VER 1 .
No
- Go to Step 3.
3) CHECK THE (X205) AMPLIFIED LEFT REAR SHELF SPEAKER (+) CIRCUIT, AND THE (X295) AMPLIFIED LEFT REAR SHELF SPEAKER (-) CIRCUITS FOR A SHORT TOGETHER
Turn the ignition off.

Disconnect the Amplifier C2 harness connector.

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

Is the resistance below 10K ohms?

Yes
- Repair the (X205) Amplified Left Rear Shelf Speaker (+) circuit, and the (X295) Amplified Left Rear Shelf Speaker (-) circuit for a short together.
- Perform the BODY VERIFICATION TEST - VER 1 .
No
- Replace the amplifier in accordance with the service information.
- Perform the BODY VERIFICATION TEST - VER 1 .