Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Dimming Schematics | |||
1 | Did you perform the Lighting Systems Diagnostic System Check? | Go to Step 2 | |
2 | Verify that the interior backlighting is inoperative. Does the interior backlighting operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are the instrument cluster backlighting lamps the only lamps that are inoperative? | Go to Step 4 | Go to Step 5 |
4 | Test the instrument panel lamp fuse supply voltage circuit to the instrument cluster connector for an open or high resistance. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 10 | Go to Step 11 |
5 | With the headlamp switch in the PARK position, move the dimmer rheostat from low to high while using a test lamp to ground to check for voltage at the ILLUM fuse in the IP fuse block. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate from dim to bright at one or more of the fuse test points? | Go to Step 6 | Go to Step 7 |
6 | Test the Instrument panel lamp fuse supply voltage circuit for a short to ground. Refer to Circuit Testing in Wiring Systems. Was a problem found? | Go to Step 9 | Go to Step 10 |
7 | Move the rheostat from low to high while using a test lamp to ground to check for voltage at the instrument panel lamps dimmer switch signal terminal of the headlamp switch. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate from dim to bright? | Go to Step 8 | Go to Step 12 |
8 | Repair the open or high resistance in the instrument panel lamps dimmer switch signal circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
9 | Repair the short to ground in the instrument panel lamp fuse supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
10 | Repair the open or high resistance in the instrument panel lamp fuse supply voltage circuit or the ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the repair? | Go to Step 13 | -- |
12 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Did you complete the repair? | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
