Explorer 2WD V8-4.6L (2008)
Body Control Systems: Initial Inspection and Diagnostic Overview
Inspection and Verification
INSPECTION AND VERIFICATION
1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
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Battery junction box (BJB) fuse 14 (30A)
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Smart junction box (SJB) fuse 1 (20A)
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Wiring, terminals or connectors
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SJB
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
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Check the VCM connection to the vehicle.
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Check the scan tool connection to the VCM.
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Refer to Information Bus (Module Communications Network), No Power To The Scan Tool, to diagnose no communication with the scan tool.
6. If the scan tool does not communicate with the vehicle:
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Verify the ignition key is in the ON position.
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Verify the scan tool operation with a known good vehicle.
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Refer to Information Bus (Module Communications Network) to diagnose no response from the PCM.
7. Carry out the network test.
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If the scan tool responds with no communication for one or more modules, refer to Information Bus (Module Communications Network).
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If the network test passes, retrieve and record the continuous memory DTCs.
8. Clear the continuous DTCs and carry out the self-test diagnostics for the DSM.
9. If the DTCs retrieved are related to the concern, refer to the Diagnostic Trouble Code (DTC) Chart. See: Diagnostic Trouble Code Descriptions
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures/Driver Seat Module (DSM)
Principles of Operation
PRINCIPLES OF OPERATION
The DSM controls the memory driver seat positions and the memory adjustable pedals. The DSM receives inputs from the memory set switches in order
to program the 2 separate, personalized memory positions for the seats and (if equipped) the adjustable pedals. These positions can be recalled by either
pressing the memory switches or by unlocking the vehicle with the remote transmitters.
The DSM also receives inputs from the driver seat switch and outputs the requested command to the seats. If the vehicle has memory, the DSM will also
receive inputs from the adjustable pedal switch and outputs the requested commands to the adjustable pedal motor. The memory driver seat feature
allows the driver to program a personalized seat position that can be recalled using the memory switches or the remote keyless entry (RKE) transmitter.
Refer to Locks for the remote memory activation general procedure.
The DSM is on the medium speed controller area network (MS-CAN). The DSM supports intermodule and scan tool communications.
Inspection and Verification
INSPECTION AND VERIFICATION
1. Verify the customer concern.
2. Visually inspect for obvious signs of electrical damage.
VISUAL INSPECTION CHART
Electrical
