Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Lighting Systems Connector End Views , Body Control System Connector End Views , or Power Door Systems Connector End Views

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition, with the engine OFF.
2. Place the headlamp switch in the PARK position.
3. Cover the ambient light sensor.
4. Turn the I/P dimmer switch from minimum to maximum intensity.

Do the interior backlighting lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Are the interior backlighting lamps always ON?

Go to Step 5

Go to Step 4

1. Install a scan tool.
2. With a scan tool, observe the Interior Dim Pot parameter in the Instrument Panel Integration Module (IPM) open/short data list.
3. Turn the I/P dimmer switch from minimum to maximum intensity.

Does the scan tool indicate that the Interior Dim Pot parameter is changing when the I/P dimmer switch is turned?

Go to Step 6

Go to Step 7

Test the backlight lamps control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

Important:: Perform the setup procedure for the appropriate control module. Refer to Body Control Module (BCM) Programming/RPO Configuration .

Replace the appropriate control module. Refer to Dash Integration Module Replacement in Body Control System, or Door Control Module Replacement in Doors .

Did you complete the replacement?

Go to Step 8

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2