Taurus AWD V6-3.5L (2009)
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, 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 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 and the Liftgate/Trunk Module (LTM) (if equipped).
9. If the DTCs retrieved are related to the concern, refer to DTC Charts See: Diagnostic Trouble Code Descriptions. For all other DTCs, refer to the
Diagnostic Trouble Code (DTC) Chart in Body Control Systems. 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).
The SJB supplies voltage to the interior lighting system. The interior lighting system illuminates the courtesy lamps to enhance visibility of the interior
while a vehicle door is ajar, and the vehicle speed is less than 15 km/h (9 mph) or 5 km/h (3 mph) for puddle lamps. The SJB controls all interior lighting
functions and timing by monitoring inputs from the door ajar switches, the instrument panel dimmer switch, and vehicle speed.
Interior Lamp Arbitrator
The SJB chooses between the interior lighting, interior mode, interior lighting delay, illuminated entry, illuminated exit and battery saver to determine
which feature has precedence of activating and deactivating the interior lamps.
The features are prioritized as follows:
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Perimeter alarm/panic alarm
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Battery saver
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Interior lighting
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Interior light delay
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Illuminated entry
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Illuminated exit
Battery Saver
The SJB provides automatic shut-off of the demand lamps and courtesy lamps after a time-out period in order to save battery voltage. A timer in the SJB
is started when the ignition is turned to the OFF position, and all the doors, and the liftgate or the luggage compartment are closed. When the time-out
period for the lamps has elapsed, the voltage is automatically shut off to the lamps by the SJB. While the SJB has voltage disabled, if the ignition is
turned to any position other than OFF, any door, liftgate or luggage compartment becomes ajar, or the UNLOCK button of the IKT transmitter is
pressed, a valid keypad code is entered, an unlock request from the cylinder is received, or the dome lamp request is detected from the instrument panel
dimmer switch, the SJB restores voltage and starts the timer again.
