For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you review the Interior Lights Dimming Circuit Description and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 | Verify that the Instrument Panel lamps are inoperative. Do the Instrument Panel lamps operate normally? | Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 |

1. Disconnect the Lamp Dimmer Control connector.
2. Turn the Headlamp Switch to the PARK position.
3. Use a J 39200 to measure the voltage between cavity 2 of the Lamp Dimmer Control and ground.

Is battery positive voltage present?

Go to Step 4

Go to Step 5

4 |

1. Turn the Dimmer Control Switch to full intensity.
2. Use a J 39200 to measure the voltage between cavity 4 of the Lamp Dimmer Control and ground.

Is battery positive voltage present?

Go to Step 6

Go to Step 7

5 | Use a J 39200 to measure the voltage between C216, cavity 22 of the Light Switch and ground. Is battery positive voltage present? | Go to Step 8 | Go to Step 9
6 | Test for an open condition between cavity 3 and S254 of the IP Lamp Dimmer Control. Does an open condition exist? | Go to Step 11 | Go to Step 12
7 |

1. Disconnect the IP Lamp Dimmer Control connector.
2. Test for continuity between cavity 2 of the Dimmer Switch and Cavity 4.

Does continuity exist?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 10

8 | With the Light Switch in the PARK position. Test for a short to ground condition between C216 cavity 17 and ground. Does a short to ground condition exist? | Go to Step 13 | Go to Testing for Intermittent Conditions and Poor Connections
9 | Repair the open between the Junction Block C5 cavity 3 and S213. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | --
10 | Replace the IP Lamp Dimmer Control. Did you complete the repair? | Go to Step 16 | --
11 | Repair the open between the Lamp Dimmer Control and splice S254. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | --
12 | Connect a fused jumper between C216, cavity 17 and C216, cavity 22 of the Light Switch. Do the Instrument Panel lamps illuminate? | Go to Step 14 | Go to Step 15
13 | Repair the open in the BLK wire between C216, cavity 17 and S207. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | --
14 | Replace the Light Switch. Did you complete the repair? | Go to Step 16 | --
15 | Repair the open between C216, cavity 22 and S239. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | --
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3