No Sound From All Speakers

NO SOUND FROM ALL SPEAKERS

No Sound From All Speakers:

POSSIBLE CAUSES
- Fused ignition switch output circuit open
- Ground circuit open
- Power amplifier

DIAGNOSTIC TEST

1. MEASURE POWER AMPLIFIER FUSED IGNITION SWITCH OUTPUT CIRCUIT VOLTAGE





NOTE: Inspect Fuse 23 located in the Underhood Accessory Fuse Block. If the fuse is open, repair the cause of the open fuse before continuing.

Turn the ignition off.
Disconnect the Power Amplifier harness connector.

NOTE: Check connector - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit at the Power Amplifier harness connector cavity 1 (connector B).

Q: Is the voltage above 10 volts?

YES: Go to 2
NO: Repair the Power Amplifier Fused Ignition Switch Output circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test

2. MEASURE POWER AMPLIFIER FUSED IGNITION SWITCH OUTPUT CIRCUIT VOLTAGE




With the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit at the Power Amplifier harness connector cavity 9 (connector B).

Q: Is the voltage above 10 volts?

YES: Go to 3
NO: Repair the Power Amplifier Fused Ignition Switch Output circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test

3. MEASURE POWER AMPLIFIER GROUND CIRCUIT RESISTANCE




Turn the ignition off.
Measure the resistance between ground and the Ground circuit at cavity 11 (connector A) of the Power Amplifier harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Go to 4
NO: Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test

4. MEASURE POWER AMPLIFIER GROUND CIRCUIT RESISTANCE




With the ignition off.
Measure the resistance between ground and the Ground circuit at cavity 4 (connector A) of the Power Amplifier harness connector.

Q: Is the resistance below 5.0 ohms?

YES: Replace the Power Amplifier. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Repair the Ground circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test