Test L: The Audio Digital Signal Processing (DSP) Module Does Not Respond To The Scan Tool

PINPOINT TEST L: THE AUDIO DIGITAL SIGNAL PROCESSING (DSP) MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The audio digital signal processing (DSP) module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the DSP module. Voltage for the DSP module amplifier is provided by circuits SBB20 (GN/RD) and SBB21 (GY/RD). Circuit GD148 (BK/YE) provides ground.

The DSP module shares the MS-CAN with the following modules:
- Accessory protocol interface module (APIM) (if equipped)
- Audio control module (ACM)
- Driver seat module (DSM) (if equipped)
- Driver door module (DDM) (if equipped)
- Dual climate control seat module (DCSM) (if equipped)
- Heating ventilation air conditioning (HVAC) module (if equipped)
- Instrument cluster (IC)
- Parking aid module (PAM) (if equipped)
- Satellite digital audio receiver system (SDARS) module (if equipped)
- Smart junction box (SJB)

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- DSP module

L1-L2:

L3-L4: