Test A: The Courtesy Lamps Are Inoperative
PINPOINT TEST A: THE COURTESY LAMPS ARE INOPERATIVENormal Operation
Voltage is supplied to the smart junction box (SJB) through the bussed electrical center (BEC) fuse 67 (30A) to the SJB. When a door is opened, the ajar switch opens, signaling the SJB. The SJB monitors the ajar circuits, and based on the ajar status, the SJB supplies voltage to the courtesy lamps on circuit 53 (BK/LB). Ground for the courtesy lamps is controlled by the SJB through circuit 54 (LG/YE).
- DTC B2021 (Dome Lamp Output Return Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage on the dome lamp return circuit.
- DTC B2550 (Dome Lamp Output Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the dome lamp output supply circuit.
- DTC B2554 (Dome Lamp Output Circuit Failure) - is a on-demand DTC that sets when the SJB detects an open on the dome lamp supply or return circuits.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Interior lamp
- SJB
A1-A3:
A4-A6:
A6-A7:
A7-A8:
