Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Lighting Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 | Verify that the instrument cluster illumination lamps are inoperative. Do the instrument cluster illumination lamps operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Are the Side Marker Lamps operating correctly? | -- | Go to Step 4 | Go to Marker Lamps Inoperative |
4 | Are all of the other dimmable instrument panel component lamps operating correctly? | -- | Go to Step 8 | Go to Step 5 |
5 | Move the rheostat from low to high and use a test lamp to ground to check for voltage at the ILLUM fuse 12 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 11 |
6 | Test CKT 1220 (GRY) for a short to ground. Refer to Circuit Testing in Wiring Systems. Was a problem found? | -- | Go to Step 7 | Go to Step 8 |
7 | Repair the short to ground in CKT 1220 (GRY). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 14 | -- |
8 | Test for an open or high resistance in CKT 1220 (GRY) or CKT 1850 (BLK). Refer to Circuit Testing in Wiring Systems. Was a problem found? | -- | Go to Step 9 | Go to Step 10 |
9 | Repair the open or high resistance in CKT 1220 (GRY) or CKT 1850 (BLK). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 14 | -- |
10 | Replace the Instrument Cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | Go to Step 14 | -- |
11 | Move the rheostat from low to high and use a test lamp to ground to check for voltage at terminal K of the IP Dimmer Switch. Refer to Circuit Testing in Wiring Systems. Does the test lamp illuminate from dim to bright? | -- | Go to Step 12 | Go to Step 13 |
12 | Repair the open or high resistance in CKT 44 (DK GRN). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 14 | -- |
13 | Replace the IP Dimmer Switch. Is the repair complete? | -- | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
