Taurus AWD V6-3.5L (2009)
Communications Network
Pinpoint Tests
Pinpoint Test I: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
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 VDB06
(GY/OG) (HS-CAN +) and VDB07 (VT/OG) (HS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN with the HVAC
module, the Accessory Protocol Interface Module (APIM), the Smart Junction Box (SJB), the Driver Seat Module (DSM), the Rear Entertainment
Module (RETM), the Satellite Digital Audio Receiver System (SDARS) module, the Liftgate/Trunk Module (LTM) and the Instrument Cluster (IC).
Voltage for the ACM is provided by circuit SPB39 (WH/RD) and circuit GD103 (BK/BU) provides ground.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
ACM
PINPOINT TEST I: THE ACM DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
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I1 CHECK THE ACM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
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Ignition OFF.
-
Disconnect: ACM C240a.
-
Ignition ON.
-
Measure the voltage between the ACM C240a-1, circuit SPB39 (WH/RD), harness side and ground.
-
Is the voltage greater than 10 volts?
Yes
GO to I2.
No
VERIFY the SJB fuse 39 (20A) is OK. If OK, REPAIR the circuit. 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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I2 CHECK THE ACM GROUND CIRCUIT FOR AN OPEN
-
Ignition OFF.
-
Measure the resistance between the ACM C240a-13, circuit GD103 (BK/BU), harness side and ground.