For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Place the headlamp switch in the PARK position.
2. Observe the park lamps.

Do the park lamps operate properly?

Go to Step 3

Go to Park Lamps Inoperative

3 |

1. Place the headlamp switch in the PARK position.
2. Operate the instrument panel (I/P) dimmer switch.

Do the instrument panel lamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 4

4 |

1. Place the headlamp switch in the OFF position.
2. Disconnect the I/P dimmer switch.
3. Connect a 3-amp fused jumper wire between the I/P dimmer switch signal circuit and a good ground.
4. Place the headlamp switch in the PARK position.

Does the back lighting illuminate?

Go to Step 5

Go to Step 6

5 | Connect the fused jumper wire between the I/P dimmer switch signal circuit and the I/P dimmer switch ground circuit. Does the back lighting illuminate? | Go to Step 8 | Go to Step 7
6 | Test the I/P dimmer switch signal circuit for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 9
7 | Test the I/P dimmer switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 12 | --
8 | Inspect for poor connections at the I/P dimmer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 10
9 | Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 11
10 | Replace the I/P dimmer switch. Refer to Instrument Panel Lamp Dimmer Switch Replacement . Did you complete the replacement? | Go to Step 12 | --
11 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2