Test B: The Courtesy Lamps Do Not Turn On With One Door Open

PINPOINT TEST B: THE COURTESY LAMPS DO NOT TURN ON WITH ONE DOOR OPEN

Normal Operation
When a door is open, the ajar switch opens the circuit to the smart junction box (SJB). The SJB monitors the ajar circuits, and based on the ajar status, the SJB supplies voltage and ground to the courtesy lamps.

The SJB sends a voltage reference signal to the LH door ajar switch through circuit 1312 (LG/BK) and the RH door ajar switch through circuit 1314 (YE/LG). The door ajar switch routes the signal to ground through circuit 1205 (BK). When the door is opened, the door ajar switch opens the circuit, signalling the SJB a request for the courtesy lamps.

The power window motors also use this input for the short drop feature.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door ajar switch
- Power window motor
- SJB

B1-B4: