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) 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 ACM. The ACM shares the MS-CAN with the instrument cluster (IC), the accessory protocol interface module (APIM), the smart junction box (SJB), the HVAC module (if equipped), the audio digital signal processing (DSP) module (if equipped), the satellite digital audio receiver system (SDARS) module (if equipped), the rear entertainment module (RETM) (if equipped), the driver seat module (DSM) (if equipped), the parking aid module (PAM) (if equipped), the liftgate/trunk module (LTM) and the dual climate control seat module (DCSM) (if equipped). Voltage for the ACM is provided by circuits CBP28 (GY/VT), CBP41 (BU) and SBP39 (WH/RD). Circuit GD114 (BK/BU) provides ground.

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

K1:

K1-K3:

K3-K4: