Headlamps - Low Beams On with Headlamp Switch Off Buick
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the entire Headlights System Check? | -- | Go to Step 2 | Go to Headlight System Check | ||||
2 |
Do the headlights turn off? | -- | Go to Step 8 | Go to Step 3 | ||||
3 | Disconnect the headlamp dimmer switch connector C202. Do the headlights turn off? | -- | Go to Step 11 | Go to Step 4 | ||||
4 | Disconnect the lamp control module (LCM) connector C1. Do the headlights turn off? | -- | Go to Step 7 | Go to Step 5 | ||||
5 | Disconnect the LCM connector C2. Do the headlights turn off? | -- | Go to Step 12 | Go to Step 6 | ||||
6 | Repair the short to battery positive voltage (B+) in the following wiring:
Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
7 | Inspect for a short to ground in CKT 103 (WHT). Refer to Testing for Short to Ground in Wiring Systems. Is CKT 103 OK? | -- | Go to Step 10 | Go to Step 14 | ||||
8 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
9 | Connect a DMM from the LCM connector C1 cavity A7 (PNK) to ground. Is the voltage within the specified range? | 10-15V | Go to Step 13 | Go to Step 12 | ||||
10 | Inspect for a short to ground in CKT 307 (YEL/BLK). Refer to Testing for Short to Ground in Wiring Systems. Is CKT 307 OK? | -- | Go to Step 9 | Go to Step 14 | ||||
11 | Replace the headlamp dimmer switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
12 | Replace the lamp control module (LCM). Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
13 | Repair the short to battery postive voltage (B+) in CKT 39 (PNK). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
14 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Headlight System Check | -- |
Headlamps - Low Beams On with Headlamp Switch Off Oldsmobile
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the entire Headlights System Check? | -- | Go to Step 2 | Go to Headlight System Check | ||||
2 |
Do the headlamps go out? | -- | Go to Step 6 | Go to Step 3 | ||||
3 | Disconnect the LCM connector C2. Do the headlamps go out? | -- | Go to Step 9 | Go to Step 4 | ||||
4 | Disconnect the headlamp dimmer switch connector C202. Do the headlamps go out? | -- | Go to Step 13 | Go to Step 5 | ||||
5 | Repair the short to battery positive voltage (B+) in the following appropriate wiring:
Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
6 | Inspect for a short to ground in CKT 103 (WHT) between the LCM and the headlamp switch. Refer to Testing for Short to Ground in Wiring Systems. Is CKT 103 OK? | -- | Go to Step 7 | Go to Step 15 | ||||
7 |
Is the resistance less than the specified value? | 5ohms | Go to Step 8 | Go to Step 10 | ||||
8 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
9 | Connect a DMM from the LCM connector C2 cavity C (PNK) to ground. Is the voltage within the specified range? | 10-15V | Go to Step 11 | Go to Step 10 | ||||
10 | Replace the lamp control module (LCM). Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
11 | Inspect for a short to battery positive voltage (B+) in CKT 3 (PNK). Refer to Testing for Continuity in Wiring Systems. Is CKT 3 OK? | -- | Go to Step 12 | Go to Step 15 | ||||
12 | Replace the ignition switch. Refer to Ignition Lock Cylinder Replacement - On Vehicle in Steering Wheel and Column - Tilt. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
13 | Inspect for a short to the battery positive voltage (B+) in CKT 1346 (LT BLU). Refer to Testing for Continuity in Wiring Systems. Is CKT 1346 OK? | -- | Go to Step 14 | Go to Step 15 | ||||
14 | Replace the headlamp dimmer switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt. Is the repair complete? | -- | Go to Headlight System Check | -- | ||||
15 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Headlight System Check | -- |
