Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Lighting Systems Connector End Views , Computer/Integrating Systems Connector End Views in Computer/Integrating Systems, or Power Door Systems Connector End Views in Doors

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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 instrument panel (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

Replace the appropriate control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

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