Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Place the headlamp switch in PARK. Connect a test lamp from CKT 13 (LT BLU) at the headlamp switch to chassis ground. Did the test lamp light? | -- | Go to Step 3 | Go to Step 2 |
2 | Connect a test lamp from CKT 1040 (ORN) at the headlamp switch to chassis ground. Does the test lamp light? | -- | Go to Step 11 | Go to Step 12 |
3 | Remove the lighting relay. Connect a J 39200 from CKT 150 (BLA) at the lighting relay to chassis ground. Does the DMM indicate continuity? | -- | Go to Step 4 | Go to Step 13 |
4 | Connect a test lamp from CKT 13 (LT BLU) at the lighting relay to the chassis ground. Did the test lamp light? | -- | Go to Step 5 | Go to Step 14 |
5 | Connect a test lamp from CKT 340 (ORN) at the lighting relay to chassis ground. Did the test lamp light? | -- | Go to Step 6 | Go to Step 15 |
6 |
Did the test lamp light? | -- | Go to Step 7 | Go to Step 16 |
7 | Connect a test lamp from CKT 9 (BRN) at the upfitter connector to chassis ground. Did the test lamp light? | -- | Go to Step 8 | Go to Step 17 |
8 | Connect a J 39200 from CKT 150 (BLA) at the upfitter connector to chassis ground. Does the DMM indicate continuity? | -- | Go to Step 9 | Go to Step 10 |
9 | Locate and repair the open in CKT 9 (BRN) between the upfitter connector and the affected lamp or lamps. Is the repair complete? | -- | System OK | -- |
10 | Locate and repair the open in CKT 150 (BLK) between the upfitter connector and ground. Is the repair complete? | -- | System OK | -- |
11 | Replace the headlamp switch. Is the repair complete? | -- | System OK | -- |
12 | Locate and repair the open in CKT 1040 (ORN) between the headlamp switch and the IP fuse block. Is the repair complete? | -- | System OK | -- |
13 | Locate and repair the open in CKT 150 (BLK) between the lighting relay and chassis ground. Is the repair complete? | -- | System OK | -- |
14 | Locate and repair the open in CKT 13 (LT BLU) between the lighting relay and the headlamp switch. Is the repair complete? | -- | System OK | -- |
15 | Locate and repair the open in CKT 340 (ORN) between the lighting relay and the IP fuse block. Is the repair complete? | -- | System OK | -- |
16 | Replace the lighting relay. Is the repair complete? | -- | System OK | -- |
17 | Locate and repair the open in CKT 9 (BRN) between upfitter connector and the lighting relay. Is the repair complete? | -- | System OK | -- |
