Pinpoint Test 6: All The Courtesy Lamps Stay On Continuously

PINPOINT TEST 6: ALL THE COURTESY LAMPS STAY ON CONTINUOUSLY

Normal Operation - Door Ajar Input

The SJB sends a voltage reference signal to the door ajar switches through circuits (G/V) (LH front door), (W) (RH front door), (G) (LH rear door) and (Y) (RH rear door). Ground is provided to the door ajar switches through circuit (B/GY). The door ajar switch is closed with the door closed. When the door is opened, the signal to ground is interrupted indicating an open door to the SJB.

Liftgate/Liftgate Glass Ajar Input

The SJB sends a voltage reference signal to the liftgate ajar switch through circuit (GY/O). The voltage signal passes through the liftgate ajar switch to the liftgate glass ajar switch through circuit (Y/O). The signal is then routed to ground through circuit (B/GY).
The liftgate and liftgate glass ajar switches are closed when the liftgate and liftgate glass are closed. The liftgate/liftgate glass ajar input is monitored from a single circuit by the SJB. The liftgate and the liftgate glass ajar switches are wired in series. When the liftgate or liftgate glass is opened, the signal to ground is interrupted indicating an open liftgate or liftgate glass (the SJB cannot determine which is open).

Instrument Panel Dimmer Switch Input

The SJB monitors the instrument panel dimmer switch status from circuit CLN17 (BN) to determine if the courtesy lamps are requested. When the instrument panel dimmer switch is rotated to the DOME LAMP position, ground is supplied to circuit CLN17 (BN).The SJB supplies voltage to the interior courtesy lamps through circuit VLN33 (GY/VT) when any of the following conditions exist.

- Any door, liftgate or liftgate glass is opened.
- The instrument panel dimmer switch is place in the DOME LAMP position.
- A correct unlock code from the keyless entry keypad or an unlock request from a programmed remote keyless entry (RKE) transmitter is detected.

- DTC B1320 (Driver Door Ajar Circuit Open) - an on-demand DTC that sets when the SJB detects an open from the LH front door ajar input circuit.
- DTC B1328 (Passenger Door Ajar Circuit Open) - an on-demand DTC that sets when the SJB detects an open from the RH front door ajar input circuit.
- DTC B1336 Door Ajar RR Circuit Open - an on-demand DTC that sets when the SJB detects an open from the RH rear door ajar input circuit.
- DTC B1572 (Door Ajar LR Circuit Open) - an on-demand DTC that sets when the SJB detects an open from the LH rear door ajar input circuit.
- DTC B1688 (Lamp Dome Input Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects a short to ground from the dome lamp request input circuit.
- DTC B2077 (Liftgate Ajar Switch Circuit Failure) - an on-demand DTC that sets when the SJB detects an open from the liftgate/liftgate window ajar input circuit.
- DTC B2A35 (Interior Lighting Output Circuit Open) - an on-demand DTC that sets when the SJB detects a short to voltage from the courtesy lamp lighting output circuit.

Possible Causes
- Wiring, terminals or connectors
- Instrument panel dimmer switch
- Liftgate ajar switch (integrated into the liftgate latch)
- Liftgate window ajar switch (integrated into the liftgate window latch)
- Door ajar switch (integrated into the door latch)
- SJB

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:Make sure the interior lamps are in the DOOR position.