Test A: The Courtesy Lamps Are Inoperative

PINPOINT TEST A: THE COURTESY LAMPS ARE INOPERATIVE

Normal Operation
Voltage is supplied to the courtesy lamps through the smart junction box (SJB) fuse 9 (15A). When any door or liftgate is opened, the ajar switch opens, signaling the SJB. The SJB monitors the ajar circuits, and based on the ajar status, the SJB energizes the solid-state relay supplying voltage to the courtesy lamps on circuit VLN33 (GY/VT). The SJB also monitors the dome defeat output through circuit VLN36 (GY/OG). A short to ground on circuit VLN36 (GY/OG) will cause the courtesy lamps to be inoperative. Ground for the courtesy lamps is supplied through circuit GD150 (BK/WH).

- 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
- Instrument panel dimmer switch
- SJB

A1-A4:

A5-A7: