Diagnostic Routine AA
Diagnostic Routine AA
Diagnostic Overview
The RF 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
REFER to Digital Signal Processing (DSP) .
DTC Fault Trigger Conditions
Pinpoint Test
1. CHECK THE AUDIO SIGNAL TO THE RF (Right Front) DOOR SPEAKER
1. Ignition OFF.
2. Disconnect: RF (Right Front) 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 RF (Right Front) DOOR SPEAKER FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: Audio DSP (Digital Signal Processing) Module C4326B.
3. Ignition ON.
4. Measure:
Is any voltage present?
3. CHECK THE AUDIO CIRCUITS TO THE RF (Right Front) 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 TO THE RF (Right Front) DOOR SPEAKER FOR AN OPEN
1. Measure:
Are the resistances less than 3 ohms?
5. CHECK THE RF (Right Front) AUDIO SIGNAL TO THE AUDIO DSP (Digital Signal Processing) MODULE
1. Ignition OFF.
2. Disconnect: Audio DSP (Digital Signal Processing) Module C4326A.
3. Ignition ON.
4. Operate the audio system in radio tuner (AM/FM (Amplitude Modulation/Frequency Modulation)) mode.
5. Measure:
Is a fluctuating AC (Alternating Current) voltage present?
6. CHECK THE RF (Right Front) AUDIO SIGNAL TO THE AUDIO DSP (Digital Signal Processing) MODULE FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: ACM (Audio Control Module) C240A.
3. Ignition ON.
4. Measure:
Is any voltage present?
7. CHECK THE RF (Right Front) AUDIO SIGNAL TO THE AUDIO DSP (Digital Signal Processing) MODULE FOR A SHORT TO GROUND
1. Ignition OFF.
2. Measure:
Are the resistances greater than 10,000 ohms?
8. CHECK THE RF (Right Front) AUDIO SIGNAL TO THE AUDIO DSP (Digital Signal Processing) MODULE FOR AN OPEN
1. Measure:
Are the resistances less than 3 ohms?
9. CHECK FOR CORRECT AUDIO DSP (Digital Signal Processing) MODULE OPERATION
1. Disconnect and inspect all the audio DSP (Digital Signal Processing) 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 audio DSP (Digital Signal Processing) 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?
10. CHECK FOR CORRECT ACM (Audio Control Module) OPERATION
1. Disconnect and inspect all the 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?
