E 450 V8-5.4L (2009)
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Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to F4.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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F4 CHECK FOR CORRECT SJB OPERATION
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Disconnect all the SJB connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the SJB connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new SJB. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the
network test with the scan tool.
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Pinpoint Test G: The Audio Control Module (ACM) Does Not Respond To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test G: 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) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the ACM. The ACM shares the MS-CAN with the Smart
Junction Box (SJB), the PAM (if equipped), and the Instrument Cluster (IC). Voltage for the ACM is provided by circuits SBP39 (WH/RD) and CBP41
(BU). Circuit GD115 (BK/GY) provides ground.
This pinpoint test is intended to diagnose the following:
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Fuse
