Schematic Reference: Interior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

DEFINITION: The courtesy lamps are inoperative from the instrument panel (I/P) dimmer switch or a single courtesy lamp is inoperative from the switch on the courtesy lamp assembly.

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 operate from the I/P dimmer switch:

•

Dome lamp

•	I/P courtesy lamps

•	Roof rail courtesy/reading lamp

•	Inside rear view mirror

Are all these courtesy lamps ON?

Go to Step 3

Go to Step 4

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

•	Roof rail courtesy/reading lamp

•	Inside rear view mirror

Are the courtesy lamps operational from their individual switches?

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

Go to Step 9

Determine which of the following lamps are inoperative from the I/P dimmer switch:

Are all of these lamps inoperative from the I/P 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 I/P lamp dimmer switch to the DOME position.

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

Go to Step 12

Go to Step 6

1. Turn ignition switch to the OFF position.
2. Disconnect the headlamp switch connector.
3. Turn ignition switch to the RUN position, with the engine OFF.
4. Probe the ground circuit for the I/P dimmer switch with a test lamp that is connected to battery voltage.

Does the test lamp illuminate?

Go to Step 7

Go to Step 16

1. Connect a fused jumper between the ground circuit and the courtesy lamp switch signal circuit of the I/P dimmer switch.
2. With a scan tool, observe the Courtesy Switch Input data.

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

Go to Step 15

Go to Step 17

1. Determine which courtesy lamp is inoperative.
2. Remove the inoperative courtesy lamp bulb.
3. Using a test lamp probe between the courtesy lamps supply voltage circuit and the courtesy lamp low control circuit of the inoperative courtesy bulb socket.

Does the test lamp illuminate?

Go to Step 13

Go to Step 10

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 24

Go to Step 14

1. Disconnect the inoperative courtesy lamp connector.
2. Using a test lamp connected to ground, probe the courtesy lamps supply voltage circuit of the inoperative courtesy lamp connector.

Does the test lamp illuminate?

Go to Step 11

Go to Step 18

Using a test lamp, probe between the courtesy lamps supply voltage circuit and the courtesy lamp low control circuit of the inoperative courtesy lamp.

Does the test lamp illuminate?

Go to Step 14

Go to Step 19

Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 20

Inspect for poor connections at the harness connector of the inoperative courtesy lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 21

Inspect for poor connections at the harness connector of the inoperative courtesy lamp assemble. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 22

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 24

Go to Step 23

Repair an open high resistance in the I/P dimmer switch ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

Repair 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 complete the repair?

Go to Step 24

--

Repair 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 complete the repair?

Go to Step 24

--

Important: Perform the set up procedure for the BCM.

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

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

Did you complete the repair?

Go to Step 24

--

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

Go to Step 24

--

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