Power Amp Shutdown - Base Audio System

POWER AMP SHUTDOWN - BASE RADIO

WHEN MONITORED
Ignition in RUN and IOD fuse installed.

SET CONDITION
The radio has sensed a short on the output for more than 10 seconds.

POSSIBLE CAUSES
- Front shorted speaker
- Rear shorted speaker
- (+) Circuit shorted to ground
- Speaker (+) & (-) circuits shorted together
- (-) Circuit shorted to ground

1. DETERMINE FAULT




Turn the ignition on.
Turn the Radio on.
With the DRBIII(R), erase the audio DTC's.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIII(R), read the audio DTC's.

Q: Does the DRBIII(R) display POWER AMP SHUTDOWN?

YES: Go To 2
NO: Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

2. FRONT SHORTED SPEAKER
Turn the ignition off.

NOTE: Perform this procedure after disconnecting each front speaker connector.

Disconnect each front speaker harness connector one at a time.
Turn the ignition on.
Turn the radio on.
With the DRBIII(R), erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIII(R), read DTC's.

Q: Does the DRBIII(R) display POWER AMP SHUTDOWN with all the speakers disconnected?

YES: Go To 3
NO: Replace the Speaker that when disconnected the DTC did not reset. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. REAR SHORTED SPEAKER
Turn the ignition off.

NOTE: Perform this procedure after disconnecting each rear speaker connector.

Disconnect each rear speaker harness connector one at a time.
Turn the ignition on.
Turn the radio on.
With the DRBIII(R), erase the audio DTCs.
Cycle the ignition switch from off to on and wait 10 seconds.
With the DRBIII(R), read DTC's.

Q: Does the DRBIII(R) display POWER AMP SHUTDOWN with all the rear speakers disconnected?

YES: Go To 4
NO: Replace the Speaker that when disconnected the DTC did not reset. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

4. (+) CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect each front and rear speaker harness connector.
Disconnect the Radio harness connector.
Measure the resistance between ground and each speaker (+) circuit.

Q: Is the resistance below 1000.0 (1K) ohms?

YES: Repair the speaker (+) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 5

5. (-) CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect each front and rear speaker harness connector.
Disconnect the Radio harness connector.
Measure the resistance between ground and each speaker (-) circuit.

Q: Is the resistance below 1000.0 (1K) ohms?

YES: Repair the speaker (-) circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 6

6. SPEAKER (+) & (-) CIRCUITS SHORTED TOGETHER




Turn the ignition off.
Disconnect each front and rear speaker harness connector.
Disconnect the Radio harness connector.
Measure the resistance between each speaker (+) circuit and each speaker (-) circuit.

Q: Is the resistance below 1000.0 (1K) ohms for any of the measurements?

YES: Repair the speaker circuits shorted together. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 7

7. SPEAKER SECTION OF RADIO
If there are no possible causes remaining, view repair.

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