Mariner 2WD V6-3.0L (2008)
B1-B2
Test C: The Courtesy Lamps Stay On Continuously
PINPOINT TEST C: THE COURTESY LAMPS STAY ON CONTINUOUSLY
Normal Operation
When any door, liftgate, or liftgate glass is opened, the ajar switch opens the circuit to the smart junction box (SJB). The smart junction box (SJB)
monitors the dimmer switch status on circuit CLN17 (BN) to determine if the courtesy lamps are requested. The SJB monitors the door ajar and
dimmer switch input circuits, and based on the status, the SJB supplies voltage to the courtesy lamps on circuit VLN33 (GY/VT).
DTC B1320 (Driver Door Ajar Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the LH front door ajar circuit.
DTC B1328 (Passenger Door Ajar Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the RH front door ajar circuit.
DTC B1336 (Door Ajar RR Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the RH rear door ajar circuit.
DTC B1572 (Door Ajar LR Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the LH rear door ajar circuit.
DTC B1688 (Lamp Dome Input Circuit Short to Ground) - is an on-demand DTC that sets when the SJB detects a short to ground from the dimmer
switch circuit.
DTC B2077 (Liftgate Ajar Switch Circuit Failure) - is an on-demand DTC that sets when the SJB detects an open from the liftgate glass or the liftgate
ajar circuit.
DTC B2A35 (Courtesy Lighting Output Circuit Open) - is an on-demand DTC that sets when the SJB detects a short to voltage from the courtesy
lamp circuit.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Dimmer switch
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Door ajar switch (part of door latch)
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Liftgate ajar switch (part of liftgate latch)
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Liftgate glass ajar switch (part of liftgate window latch)
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SJB