Expedition 2WD V8-5.4L (2009)
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Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to N4.
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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N4 CHECK FOR CORRECT AUDIO RCU OPERATION
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Disconnect the audio RCU connector.
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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 the audio RCU connector and make sure it seats 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 audio RCU. TEST the system for normal operation.
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 O: The Rear Entertainment Module (RETM) Does Not Respond To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test O: The Rear Entertainment Module (RETM) 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 132, Video System for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
The Rear Entertainment Module (RETM) 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 RETM. Voltage for the RETM is provided by
circuit SBP03 (BU/RD). Circuit GD114 (BK/BU) provides ground.
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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RETM
