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 network with the smart junction box (SJB), driver seat module (DSM) (if equipped), electronic automatic temperature control (EATC) or electronic manual temperature control (EMTC) module, DVD player (if equipped), satellite digital audio receiver system (SDARS) module (if equipped) and the instrument cluster. Voltage for the ACM is provided by circuit SBP39 (WH/RD). Ground is provided by circuit GD114 (BK/BU).

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

K1-K2:

K2-K4: