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

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

Normal Operation
When the liftgate is opened, the liftgate ajar switch (or power liftgate module, if equipped) opens the ground signal to the smart junction box (SJB) through circuit CPL58 (GY/OG). The SJB monitors the liftgate ajar circuit, and based on the ajar status, the SJB 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 power liftgate module detects a short to ground from the liftgate ajar input circuit to the SJB.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Liftgate ajar switch (part of the liftgate latch)
- Rear wiper motor
- Power liftgate module
- SJB

E1-E5: