Test K: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

PINPOINT TEST K: THE AUDIO CONTROL MODULE (ACM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The audio control module (ACM) communicate with the scan tool through the medium speed controller area network (MS-CAN) circuits VDB06 (GY/OG) and VDB07 (VT/OG).

Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the ACM. Voltage for the ACM is provided by circuits CBP02 (GN) and SBP11 (BU/RD). Circuit GD114 (BK/BU) provides ground.

The ACM shares the MS-CAN with the following modules:
- Accessory protocol interface module (APIM) (if equipped)
- Audio digital signal processing (DSP) module (if equipped)
- 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
- ACM

K1:

K1-K3:

K3-K4: