Pinpoint Test 11: The Audio Control Module (ACM) Does Not Respond To The Scan Tool

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PINPOINT TEST 11: THE AUDIO CONTROL MODULE (ACM) DOES NOT RESPOND TO THE SCAN TOOL - HYBRID

Normal Operation

The audio control module (ACM) communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits (GY/O) (MS-CAN +) and (V/O) (MS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN network with the instrument cluster (IC), the HVAC module, the smart junction box (SJB), the satellite digital audio receiver system (SDARS) module, the front controls interface module (FCIM) and the front display interface module (FDIM). Voltage for the ACM is provided by circuit (W/R). Ground is provided by circuit (B/GY).

Possible Causes
- Fuse
- Wiring, terminals or connectors
- ACM

Diagnostic Procedure

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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