Mustang V8-4.6L (2009)
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The Audio Control Module (ACM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN). Circuits 1847
(WH/OG) (MS-CAN +) and 1848 (PK/OG) (MS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN with the Smart
Junction Box (SJB), the SDARS module (if equipped), and the Instrument Cluster (IC). Voltage for the ACM is provided by circuits 687 (GY/YE) and
729 (RD/WH). Circuit 1204 (BK/OG) provides ground.
This pinpoint test is intended to diagnose the following:
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Fuse
-
Wiring, terminals or connectors
-
ACM
PINPOINT TEST E: THE ACM DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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E1 CHECK THE ACM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
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Ignition OFF.
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Disconnect: ACM C290d.
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Ignition ON.
-
Measure the voltage between the ACM C290d-1, circuit 729 (RD/WH), harness side and ground.
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Are the voltages greater than 10 volts?
Yes
GO to E2.
No
VERIFY the Bussed Electrical Center (BEC) fuse 56 (20A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to
IDENTIFY the possible causes of the short circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
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E2 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: Negative Battery Cable.
-
Measure the resistance between the ACM C290d-13, circuit 1204 (BK/OG), harness side and ground.
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Is the resistance less than 5 ohms?