Five Hundred AWD V6-3.0L VIN 1 (2005)
Courtesy Lamp: Initial Inspection and Diagnostic Overview
Principles of Operation
PRINCIPLES OF OPERATION
When the SJB detects a request for lighting, it turns on the interior lamps by supplying power to the lamps. The request for lighting can be an open door
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 hard-wired directly to the SJB. The 4 door ajar switches are normally closed when the doors are closed. The liftgate/decklid
ajar switch is normally open when the doors are closed. All door ajar switches receive voltage from the SJB and each has its own ground circuit.
The instrument panel dimmer switch receives a voltage signal from the SJB. The instrument panel dimmer switch provides variable resistance for
backlighting the instrument cluster and a toggle ON/OFF function for the interior lights.
The RKE receiver is contained inside the SJB. When the SJB receives an unlock request from an RKE transmitter, it unlocks the doors and turns on the
interior lamps.
Inspection and Verification
INSPECTION AND VERIFICATION
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.
VISUAL INSPECTION CHART
Electrical
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Smart junction box (SJB) fuse(s)
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Circuitry open/shorted
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Loose or corroded connections
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Lamp(s)
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Dimmer switch
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Door ajar switches
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Smart junction box (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. If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool
menu. If the diagnostic tool does not communicate with the vehicle:
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check that the program card is correctly installed.
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check the connections to the vehicle.
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check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
6. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
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SCP, ISO or UBP circuits fault; all electronic control units no response/not equipped, refer to Information Bus (Module Communications
Network).
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No response/not equipped for SJB, REFER to Body Control Systems (Multifunction Electronic Control Modules).
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System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test
diagnostics for the SJB.
7. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index. See: Diagnostic
Trouble Code Descriptions
8. If no DTCs related to the concern are retrieved, GO to Symptom Chart. See: Symptom Related Diagnostic Procedures
