Schematic Reference: Interior Lights Schematics

DEFINITION: The courtesy lamps are inoperative from the dimmer switch.

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn the ignition to the ON position.
2. Close all the doors and turn the I/P lamp dimmer switch to the DOME position.
3. Determine if all the following lamps operative from the dimmer switch.

•	Ignition switch lamp

•	Foot well courtesy lamps

•	Roof rail courtesy/reading lamp

•	Inside rear view mirror

•	Vanity mirror lamps

Are all these courtesy lamps ON?

Go to Step 3

Go to Step 4

1. Close all the doors and turn the dimmer switch to the OFF position.
2. Operate the following lamps from their individual switches.

•	Roof rail courtesy/reading lamps

•	Inside rear view mirror

•	Vanity mirror lamps

Are the courtesy lamps operational from their individual switches.

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

Go to Step 10

Determine which of the following lamps are inoperative from the dimmer switch.

Are all of these lamps inoperative from the dimmer switch?

Go to Step 5

Go to Step 8

1. Turn ignition switch to the RUN position, with the engine OFF.
2. With a scan tool, observe the Courtesy Switch Input data.
3. Turn the dimmer switch to the DOME position.

Does the scan tool indicate that the courtesy switch input is ON?

Go to Step 13

Go to Step 6

Test for an open or high resistance in the courtesy lamp switch signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 7

Test for an open or high resistance in the dimmer switch fuse supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 16

1. Determine which courtesy lamp is inoperative.
2. Remove the inoperative courtesy lamp bulb.
3. Probe the courtesy lamps supply voltage circuit of the inoperative courtesy lamp bulb with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 11

Probe the courtesy lamp low control circuit of the inoperative courtesy lamp bulb with a test lamp that is connected to a battery positive voltage.

Does the test lamp illuminate?

Go to Step 14

Go to Step 12

Test for an open or high resistance in the individual switch ground circuit of the inoperative courtesy lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 15

Test for an open or high resistance in the courtesy lamp supply voltage circuit of the inoperative courtesy lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 15

Test for an open or high resistance in the courtesy lamp low control circuit of the inoperative courtesy lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 15

Important: Perform the set up procedure for the body control module.

Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System.

Go to Step 17

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Replace the inoperative courtesy lamp bulb. Refer to the appropriate procedure:

Did you complete the repair?

Go to Step 17

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Replace the inoperative courtesy lamp assemble. Refer to the appropriate procedure:

Did you complete the repair?

Go to Step 17

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Replace the dimmer switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gages, and Console.

Is the repair complete?

Go to Step 17

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1. Connect all the connectors and components that were disconnected.
2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2