Test L: The Courtesy Lamps Do Not Turn On With The Liftgate Open

PINPOINT TEST L: THE COURTESY LAMPS DO NOT TURN ON WITH THE LIFTGATE OPEN

Normal Operation
When the liftgate is opened, the ajar switch (or liftgate/trunk module (LTM), if equipped) opens the circuit to the smart junction box (SJB). The SJB monitors the ajar circuit, and based on the ajar status, supplies voltage to the courtesy lamps on circuit VLN33 (GY/VT).

- DTC B2721 (Liftgate/Decklid Ajar Output Short to Ground or Open) - is a continuous and on-demand DTC that sets when the LTM detects a short to ground from the SJB, or liftgate ajar circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Liftgate ajar switch
- LTM
- SJB

L1-L2:

L3-L4: