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

Interior Lighting

Pinpoint Tests

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

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

Normal Operation

When the liftgate is opened, the liftgate ajar switch (or Liftgate/Trunk Module (LTM), 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) - a continuous and on-demand DTC that sets when the LTM 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)
- LTM
- SJB



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

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

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E1 CHECK THE LTM OR THE LIFTGATE LATCH


- Ignition OFF.
- Disconnect: LTM C4174a (Power Liftgate) or Liftgate Latch C4185 (Manual Liftgate).
- Do the courtesy lamps illuminate?

Yes
If equipped with a power liftgate, GO to E4.

If equipped with a manual liftgate, INSTALL a new liftgate latch. TEST the system for normal operation.

No
GO to E2.

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E2 CHECK CIRCUIT CPL58 (GY/OG) FOR A SHORT TO GROUND


- Disconnect: SJB C2280c.
- Measure the resistance between the SJB C2280c-16, circuit CPL58 (GY/OG), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to E3.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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E3 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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. 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.

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E4 CHECK FOR CORRECT LTM OPERATION


- Disconnect all the LTM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the LTM 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 LTM. 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. CLEAR the DTCs. REPEAT the self-test.

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