Pinpoint Test J: The Ambient Lighting Is Inoperative

Interior Lighting

Pinpoint Test J: The Ambient Lighting Is Inoperative

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information Electrical Diagrams.

Normal Operation

The HVAC module provides voltage and ground to the LEDs. There are 3 LEDs (Edge) (red, blue and green) or 4 LEDs (MKX) (red, blue, green and white) housed within each LED assembly. By illuminating various color combinations, the LEDs are able to produce 7 different colors of ambient light.

The HVAC module receives input from the Accessory Protocol Interface Module (APIM) and the Body Control Module (BCM) over the communication network for color and brightness settings. The HVAC module retains the last color and brightness setting between uses.

There ambient lighting system illuminates the following:

- Cupholders (located in the center console)

- Storage compartment(s)/map pocket (located in the center console)

- Front footwells (located under the instrument panel)

- Rear footwells (located in the rear of the center console)

- Inside pull handles (located in each door trim panel)

- Door map pockets (located in each door trim panel)

The HVAC module has a separate ground circuit for the ambient lighting system.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- HVAC module

PINPOINT TEST J : THE AMBIENT LIGHTING IS INOPERATIVE

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

J1 CHECK FOR COMMUNICATION TO THE HVAC MODULE

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Network Test.

- Carry out the network test using the scan tool.

Does the scan tool communicate with the HVAC module?

Yes
GO to J2.

No
REFER to Information Bus.

J2 CHECK THE CLIMATE CONTROL OPERATION

- Check the operation of the climate control system and verify that all of the climate controls operate correctly.

Does the climate control system operate correctly?

Yes
GO to J3.

No
REFER to Heating and Air Conditioning.

J3 CHECK THE AMBIENT LIGHTING GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Disconnect: HVAC Module C228C.

- Measure the resistance between the HVAC module C228C-8, circuit GD908 (BK), harness side and ground.






Is the resistance less than 5 ohms?

Yes
GO to J4.

No
REPAIR circuit GD908 (BK) or circuit GD115 (BK/GY) for an open. TEST the system for normal operation.

J4 CHECK FOR CORRECT HVAC MODULE OPERATION

- Disconnect all the HVAC module connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the HVAC module 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 HVAC module. 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.