Schematic Reference: Interior Lights Dimming Schematics

Connector End View Reference: Master Electrical Component List

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn the ignition to the ON position.
2. Turn the headlamp switch to the PARK position.
3. Turn the instrument panel (I/P) lamp dimmer switch to a high position.

Are all the I/P lamps on?

Go to Step 3

Go to Step 5

Are all of the class 2 dimming lamps inoperative?

Go to Step 17

Go to Step 4

Is one of the class 2 dimming lamp inoperative?

Go to Step 20

Go to Testing for Intermittent Conditions and Poor Connections

Are all of the instrument panel lamps inoperative?

Go to Step 13

Go to Step 6

Are any of the steering wheel control lamps inoperative?

Go to Step 7

Go to Step 15

Is one steering wheel control switch illuminated?

Go to Step 9

Go to Step 8

1. Remove both steering wheel control switches.
2. Probe the I/P lamp supply voltage circuit of each switch with a test lamp connected to ground. Refer to Circuit Testing .

Does the test lamp illuminate a each supply circuit?

Go to Step 11

Go to Step 10

1. Remove the inoperative switch.
2. Probe the I/P lamp supply voltage circuit of the inoperative switch with a test lamp connected to ground. Refer to Circuit Testing .

Does the test lamp illuminate?

Go to Step 11

Go to Step 10

Test for a high resistance or an open in the I/P lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 16

Test for a high resistance or an open in the I/P lamp ground circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 16

1. Disconnect the I/P dimming switch.
2. Install a fused jumper between the I/P dimming reference voltage circuit and the instrument panel lamps dimming control circuit.

Do the instrument panel lamps turn on?

Go to Step 21

Go to Step 22

Inspect the instrument panel lamps dimming control circuit for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 22

Go to Step 14

Inspect the I/P dimming reference voltage circuit and the I/P dimming return circuit for a short to battery positive. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 12

Inspect for a high resistance or an open in the inoperative instrument panel lamp supply voltage circuit or the ground circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 20

Inspect for a poor connection at the harness connector of the steering wheel control switches. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 19

Test for a short to ground poor connection or an open in the CHMSL/Backup fuse circuit of the body control module (BCM). Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 18

Test for a short to ground in the I/P lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 23

Go to Step 22

Replace the inoperative switch. Refer to Steering Wheel Control Switch Assembly Replacement .

Did you complete the repair?

Go to Step 23

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Replace the inoperative component or bulb.

Did you complete the repair?

Go to Step 23

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Replace the I/P dimming switch. Refer to Instrument Panel Lamp Dimmer Switch Replacement .

Did you complete the repair?

Go to Step 23

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Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 23

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 5