Diagnostic Routine L
Diagnostic Routine L
Diagnostic Overview
The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 13 for schematic and connector information Electrical Diagrams.
Refer to Wiring Diagram Set 130 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
The audio DSP (Digital Signal Processing) module communicates with the scan tool through the MS-CAN (Medium Speed Controller Area Network). The IPC (Instrument Panel Cluster) is used as the gateway module.
Visual Inspection and Diagnostic Pre-checks
Verify RJB (Rear Junction Box) fuse 23 (25A) is OK.
Pinpoint Test
1. CHECK THE AUDIO DSP (Digital Signal Processing) MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
1. Ignition OFF.
2. Disconnect: Audio DSP (Digital Signal Processing) module C4326C.
3. Ignition ON.
4. Measure:
Are the voltages greater than 11 volts?
2. CHECK THE AUDIO DSP (Digital Signal Processing) MODULE GROUND CIRCUITS FOR AN OPEN
1. Ignition OFF.
2. Measure:
Are the resistances less than 3 ohms?
3. CHECK THE I-CAN (Infotainment Controller Area Network) CIRCUITS BETWEEN THE AUDIO DSP (Digital Signal Processing) MODULE AND THE IPC (Instrument Panel Cluster) FOR AN OPEN
1. Disconnect: IPC (Instrument Panel Cluster).
2. Disconnect: Audio DSP (Digital Signal Processing) module C4326A.
3. Measure:
Are the resistances less than 3 ohms?
4. CHECK FOR CORRECT AUDIO DSP (Digital Signal Processing) MODULE OPERATION
1. Ignition OFF.
2. Disconnect and inspect all the audio DSP (Digital Signal Processing) module connectors.
3. Repair:
- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary
4. Reconnect the audio DSP (Digital Signal Processing) module connectors. Make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
