Diagnostic Routine AB

Diagnostic Routine AB

Diagnostic Overview

The LR Door Speaker Is Inoperative Or Has Poor Sound Quality

Refer to Wiring Diagram Set 130 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The ACM (Audio Control Module) directs audio signals to the LR (Left Rear) door speaker in the form of fluctuating AC (Alternating Current) voltage. The LH (Left Hand) quarter panel speaker shares the same audio signal with the LR (Left Rear) door speaker.

DTC Fault Trigger Conditions

Pinpoint Test

1. CHECK THE AUDIO SIGNAL TO THE LR (Left Rear) DOOR SPEAKER

1. Ignition OFF.

2. Disconnect: LR (Left Rear) Door Speaker.

3. Operate the audio system in radio tuner (AM/FM (Amplitude Modulation/Frequency Modulation)) mode.

4. Measure:

Is a fluctuating AC (Alternating Current) voltage present?

2. CHECK THE AUDIO CIRCUITS TO THE LR (Left Rear) DOOR SPEAKER FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: ACM (Audio Control Module) C240A.

3. Disconnect: LH (Left Hand) Quarter Panel Speaker.

4. Ignition ON.

5. Measure:

Is any voltage present?

3. CHECK THE AUDIO CIRCUITS TO THE LR (Left Rear) DOOR SPEAKER FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:

Are the resistances greater than 10,000 ohms?

4. CHECK THE AUDIO CIRCUITS FOR A SHORT TOGETHER

1. Measure:

Is the resistance greater than 10,000 ohms?

5. CHECK THE AUDIO CIRCUITS TO THE LR (Left Rear) DOOR SPEAKER FOR AN OPEN

1. Measure:

Are the resistances less than 3 ohms?

6. CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

1. Disconnect and inspect all ACM (Audio Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

3. Reconnect the ACM (Audio Control Module) connectors. Make sure they seat and latch correctly.

4. Operate the system and determine if the concern is still present.

Is the concern still present?