Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Did the test lamp light? | -- | Go to Step 2 | Go to Step 3 |
2 | Backprobe the headlamp switch with a test lamp from terminal 4 to B+. Did the test lamp light? | -- | Go to Step 4 | Go to Step 5 |
3 | Repair the open in CKT 87 (BLK) between the headlamp switch and G105. Do the headlamps light? | -- | System OK | -- |
4 | Backprobe the lighting relay with a test lamp from terminal 86 to B+. Did the test lamp light? | -- | Go to Step 6 | Go to Step 7 |
5 | Replace the headlamp switch. Do the headlamps light? | -- | System OK | -- |
6 | Backprobe the lighting relay with a test lamp from terminal 85 to ground. Did the test lamp light? | -- | Go to Step 8 | Go to Step 9 |
7 | Repair the open in CKT 717 (RED/BLK) between the lighting relay and the headlamp switch. Do the headlamps light? | -- | System OK | -- |
8 | Backprobe the lighting relay with a test lamp from terminal 87 to B+. Did the test lamp light? | -- | Go to Step 10 | Go to Step 11 |
9 | Install a known good relay in place of the lighting relay. If headlamps still do not light, then repair the open in CKT 727 (ORN) between the IP fuse block and the lighting relay. Do the headlamps light? | -- | System OK | -- |
10 | Backprobe the lighting relay with a test lamp from terminal 30 to B+. Did the test lamp light? | -- | Go to Step 12 | Go to Step 13 |
11 | Backprobe the low/high lighting relay with a test lamp from terminal 30 to B+. Did the test lamp light? | -- | Go to Step 14 | Go to Step 15 |
12 | Repair the open in CKT 691 (RED/BLK) between S315 and the lighting relay. Do the headlamps light? | -- | System OK | -- |
13 | Replace the lighting relay. Do the headlamps light? | -- | System OK | -- |
14 | Backprobe the lighting high/low relay with a test lamp from terminal 86 to B+. Did the test lamp light? | -- | Go to Step 16 | Go to Step 17 |
15 | Repair the open in CKT 720 (BLK) between the lighting high/low relay and G105. Do the headlamps light? | -- | System OK | -- |
16 | Repair the open in CKT 721 (RED/YEL) between the lighting high/low relay, diode module 2, the instrument cluster, and the headlamp switch. Do the headlamps light? | -- | System OK | -- |
17 | Backprobe the lighting high/low relay with a test lamp from terminal 87A to B+. Did the test lamp light? | -- | Go to Step 18 | Go to Step 19 |
18 | Repair the open in CKT 716 (YEL) between the lighting relay and the lighting high/low relay. Do the headlamps light? | -- | System OK | -- |
19 | Replace the lighting high/low relay. Do the headlamps light? | -- | System OK | -- |
