Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Interior Lights Dimming Schematics Connector End View Reference: Lighting Systems Connector End Views or Instrument Panel, Gages, and Console Connector End Views in Instrument Panel, Gages, and Console | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
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 panel cluster (IPC) backlighting lamps the only lamps that are inoperative? | Go to Step 4 | Go to Step 5 |
4 | Test the instrument panel (I/P) 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 I/P 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 I/P 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 I/P 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 I/P 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 I/P 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 I/P 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 IPC. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. 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 |
