Ranger 4WD V6-4.0L (2009)
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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 for 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, go to DTC Charts. For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in
Body Control Systems. See: Diagnostic Trouble Code Descriptions See: Body and Frame/Body Control Systems/Testing and
Inspection/Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) Chart
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
Principles of Operation
Interior Lighting
Principles of Operation
NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
Interior Lighting
When the SJB detects a request for lighting, it turns on the interior lamp by supplying power to the lamp. The request for lighting can be a signal from a
door ajar switch, an interior lighting on command from the instrument panel dimmer switch or an unlock command from a Remote Keyless Entry (RKE)
transmitter. The door ajar switches are hardwired directly to the SJB. The door ajar switches are normally open when the doors are closed. All door ajar
switches receive a voltage signal from the SJB and each has its own ground circuit. The instrument panel dimmer switch receives a voltage signal from
the SJB and has its own ground circuit. The instrument panel dimmer switch provides variable resistance for backlighting the Instrument Cluster (IC) and
a toggle on/off function for the courtesy lamp.
The SJB controls the interior courtesy lamps through the interior lamp relay (internal to the SJB).
The inputs are:
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Ignition switch position
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LH front door ajar switch
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RH front door ajar switch
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LH rear door ajar switch
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RH rear door ajar switch
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RKE unlock signal
For additional door ajar switch information, refer to Locks.
The output is:
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Interior lamp relay
Illuminated Entry (Option)
The illuminated entry feature requests the interior courtesy lamp on when the ignition switch is in the OFF position and the operator activates an external
unlock feature (key fob). The illuminated entry feature requests the interior courtesy lamp off when:
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25 seconds have elapsed
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the ignition transitions out of the OFF position
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the customer activates an external lock feature
The inputs are:
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Ignition switch position
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Unlock request from the RKE transmitter
