Ranger 2WD V6-4.0L (2010)
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 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 with one or more modules, refer to Information Bus.
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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 SJB.
9. If the DTCs retrieved are related to the concern, refer to Diagnostic Trouble Code (DTC) Chart See: Testing and Inspection. For all other DTCs,
refer to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems.
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
Principles of Operation
Parking, Rear and License Plate Lamps
Principles of Operation
NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
Voltage is supplied at all times to the parking lamp relay. The parking lamp relay is integrated into the SJB. When the headlamp switch is placed in the
PARKING LAMPS ON position, voltage is routed to the SJB, signaling a request for the parking lamps. When the SJB receives this request, the relay is
energized and voltage is supplied to the parking lamps.
