Pinpoint Test B: The Courtesy Lamps Do Not Illuminate With The Liftgate Or Liftgate Window Open

Interior Lighting

Pinpoint Test B: The Courtesy Lamps Do Not Illuminate With the Liftgate Or Liftgate Window Open

Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information Electrical Diagrams.

Normal Operation

The Smart Junction Box (SJB) sends a voltage signal to the liftgate ajar switch. The voltage signal passes through the liftgate ajar switch to the liftgate window ajar switch. The signal is then routed to ground.

The liftgate and the liftgate window ajar switches are wired in series and are monitored from a single circuit by the SJB (Smart Junction Box). The liftgate and liftgate window ajar switches are closed when the liftgate and liftgate window are closed. When the liftgate or liftgate window is opened, the ajar switch opens and the signal to ground is interrupted indicating an open liftgate or liftgate window (the SJB (Smart Junction Box) cannot determine which is open).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Liftgate ajar switch (integrated into the liftgate latch)

- Liftgate window ajar switch (integrated into the liftgate window latch)

- SJB (Smart Junction Box)

PINPOINT TEST B : THE COURTESY LAMPS DO NOT ILLUMINATE WITH THE LIFTGATE OR LIFTGATE WINDOW OPEN

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK THE COURTESY LAMP OPERATION FROM ANY DOOR

- Ignition OFF.

- Open any door and observe the courtesy lamps.

Do the courtesy lamps illuminate?

Yes
B2.

No
GO to Pinpoint Test A Pinpoint Test A: The Courtesy Lamps Do Not Illuminate With A Door Open.

B2 CHECK THE COURTESY LAMP OPERATION FROM THE LIFTGATE AND THE LIFTGATE WINDOW

- Open and close the liftgate.

- Open and close the liftgate window.

Are the courtesy lamps inoperative from both the liftgate and the liftgate window?

Yes
GO to B4.

No
If the courtesy lamps are inoperative from the liftgate, INSTALL a new liftgate ajar switch. TEST the system for normal operation.

If the courtesy lamps are inoperative from the liftgate window, GO to B3.

B3 CHECK THE COURTESY LAMP OPERATION FROM THE LIFTGATE AND THE LIFTGATE WINDOW

- Disconnect: Liftgate Window Ajar Switch C479.

Do the courtesy lamps illuminate?

Yes
INSTALL a new liftgate window latch. TEST the system for normal operation.

No
REPAIR circuit CPL44 (YE/OG) for a short to ground. TEST the system for normal operation.

B4 CHECK THE LIFTGATE/LIFTGATE WINDOW AJAR INPUT CIRCUIT FOR A SHORT TO GROUND

- Disconnect: SJB (Smart Junction Box) C2280C.

- Disconnect: Liftgate Ajar Switch C478.

- Measure the resistance between the liftgate ajar switch C478-2, circuit CPL58 (GY/OG), harness side and ground.





Is the resistance greater than 10,000 ohms?

Yes
GO to B5.

No
REPAIR circuit CPL58 (GY/OG) for a short to ground. TEST the system for normal operation.

B5 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new SJB (Smart Junction Box). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.