For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Interior Lights Dimming Schematics
1 | Did you review the Lighting System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 | Verify that the IP compartment lamps are inoperative. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 |

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

Do the tail lamps illuminate?

Go to Step 8

Go to Step 4

4 |

1. Remove the tail lamp relay from the tail lamp relay socket.
2. Test for open between the tail relay socket cavity 3 and ground.

Is there an open to ground in the LT GRN wire?

Go to Step 5

Go to Step 6

5 | Test for B+ at cavity 4 of the TAIL Relay socket. Was the voltage measured equal to B+? | Go to Step 7 | Go to Step 11
6 | Repair the open in the LT GRN wire between the junction block 2, C3 cavity 6 and the daytime running lamps control module. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | --
7 | Replace the tail relay. Is the replacement complete? | Go to Step 12 | --
8 |

1. Disconnect the IP lamp dimmer.
2. Test for high resistance between cavity 2 of the IP lamp dimmer connector and ground.

Was there high resistance to ground in the WHT/BLK wire?

Go to Step 9

Go to Step 10

9 | Replace the IP lamp controller. Refer to Instrument Panel Lamp Dimmer Switch Replacement . Is the replacement complete? | Go to Step 12 | --
10 | Repair the open in the WHT/BLK wire between IP lamp dimmer connector cavity 2 and ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | Go to Step 12 | --
11 | Replace the junction block 2. Refer to Instrument Panel Wiring Harness Replacement in Instrument Panel, Gauges, and Console. Is the replacement complete? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3