B1478

B1478-CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER





For a complete wiring diagram Refer to Diagrams/Electrical.

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





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 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 BODY VERIFICATION TEST VER-1. Body Verification Test

2.CHECK THE OPERATION OF THE AMPLIFIED LEFT REAR DOOR SPEAKER

Disconnect the Amplified Left Rear Door 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 Door Speaker.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test

No

- Go To 3

3.CHECK THE (X393) AMPLIFIED LEFT REAR DOOR SPEAKER (+) CIRCUIT, AND THE (X303) AMPLIFIED LEFT REAR DOOR SPEAKER (-) CIRCUITS FOR A SHORT TOGETHER

Turn the ignition off.

Disconnect the Amplifier C1 harness connector.

Measure the resistance between the (X393) Amplified Left Rear Door Speaker (+) circuit, and the (X303) Amplified Left Rear Door Speaker (-) circuit.

Is the resistance below 10K ohms?

Yes

- Repair the (X393) Amplified Left Rear Door Speaker (+) circuit, and the (X303) Amplified Left Rear Door Speaker (-) circuit for a short together.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test

No

- Replace the Amplifier.
- Perform BODY VERIFICATION TEST VER-1. Body Verification Test