Taurus FWD V6-3.5L (2008)
Courtesy Lamp: Pinpoint Tests
Test A: The Courtesy Lamps Are Inoperative
PINPOINT TEST A: THE COURTESY LAMPS ARE INOPERATIVE
Normal Operation
Power is supplied to the courtesy lamps through the smart junction box (SJB) fuse 9 (15A). When any door or the liftgate is opened, the ajar switch
opens, signaling the SJB. The SJB monitors the ajar circuits and IKT input. Based on the input status, the SJB supplies voltage to the courtesy lamps
on circuit VLN33 (GY/VT). Ground is supplied through circuits GD133 (BK) and GD147 (BK/VT) for the courtesy lamps.
DTC B2A35 (Interior Lighting Output Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the interior lighting circuit.
DTC B2A36 (Interior Lighting Output Circuit Short To Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to
ground from the interior lighting circuit.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
SJB
A1-A2
Test B: The Courtesy Lamps Stay On Continuously
PINPOINT TEST B: THE COURTESY LAMPS STAY ON CONTINUOUSLY
Normal Operation
When any door or the liftgate is opened, the ajar switch (or the power liftgate module if equipped) opens the circuit to the smart junction box (SJB) to
indicate a request for the courtesy lamps. When the instrument panel dimmer switch is rotated to the dome detent, ground is supplied on circuit
CLN28 (GN/BU) to the SJB. The SJB monitors the ajar circuits and the dome input circuit. Based on the inputs, the SJB supplies voltage to the
courtesy lamps on circuit VLN33 (GY/VT).
