For 1990-2009 cars

## Park Lamps Inoperative Oldsmobile

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the entire Exterior Lights System Check? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 | Backprobe the headlamp switch connector with a test lamp from cavity G (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 9
3 | Backprobe the RH IP fuse block park lamp relay position K connector with a test lamp from cavity 30 (ORN) to ground. Does the test lamp light? | -- | Go to Step 4 | Go to Step 15
4 |

1. Disconnect the lamp control module (LCM) connector C1.
2. Connect a DMM from the LCM connector C1 cavity H (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 5

Go to Step 16

5 |

1. Backprobe the RH IP fuse block park lamp relay position K connector with a test lamp from cavity 85 (LT BLU) to ground.
2. Place the headlamp switch in the PARK position.

Does the test lamp light?

--

Go to Step 6

Go to Step 10

6 | Backprobe the RH IP fuse block park lamp relay position K connector from cavity 30 (ORN) to cavity 86 (BLK). Does the test lamp light? | -- | Go to Step 7 | Go to Step 12
7 |

1. Remove the park lamp relay position K from the RH IP fuse block.
2. Connect a fused jumper from the RH IP fuse block position K connector cavity 30 (ORN) to cavity 87 (BRN).

Do the park lamps light?

--

Go to Step 13

Go to Step 8

8 | Repair the open in CKT 9 (BRN) between the RH IP fuse block and S204. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
9 | Repair the open in CKT 240 (ORN) between S202 and the headlamp switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
10 | Inspect for an open in CKT 74 (LT BLU) between the headlamp switch and the RH IP fuse block. Refer to Testing for Continuity in Wiring Systems. Is CKT 74 OK? | -- | Go to Step 11 | Go to Step 14
11 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Exterior Lights System Check | --
12 | Repair the open in CKT 1450 (BLK) between the RH IP fuse block and S308. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
13 | Replace the park lamp relay position K. Is the repair complete? | -- | Go to Exterior Lights System Check | --
14 | Repair the open in CKT 74 (LT BLU). Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
15 | Repair the open in CKT 240 (ORN) between S202 and the RH IP fuse block. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
16 | Repair the open in CKT 240 (ORN) between S202 and the LCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --

## Park Lamps Inoperative Pontiac

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Exterior Lights System Check? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 | Backprobe the headlamp switch connector with a test lamp from cavity E (ORN) to ground. Does the test lamp light? | -- | Go to Step 3 | Go to Step 7
3 |

1. Disconnect the lamp control module (LCM) connector C1.
2. Connect a DMM from the LCM connector C1 cavity H (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 4

Go to Step 8

4 |

1. Reconnect the LCM connector C1.
2. Disconnect the headlamp switch connector.
3. Connect a fused jumper from the headlamp switch connector cavity E (ORN) to cavity G (BRN).

Do the park lamps light?

--

Go to Step 5

Go to Step 6

5 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Exterior Lights System Check | --
6 | Repair the open in CKT 9 (BRN) between the headlamp switch and S204. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
7 | Repair the open in CKT 240 (ORN) between the IP fuse block and the headlamp switch. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
8 | Repair the open in CKT 240 (ORN) between the IP fuse block and the LCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --

## Park Lamps Inoperative Buick

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the entire Exterior Lights System Check? | -- | Go to Step 2 | Go to Exterior Lights System Check
2 |

1. Disconnect the lamp control module (LCM) connector C1.
2. Connect a DMM from the LCM connector C1 cavity C (ORN) to ground.

Is the voltage within the specified range?

10-15V

Go to Step 3

Go to Step 8

3 |

1. Reconnect the LCM connector C1.
2. Disconnect the headlamp switch connector.
3. Connect a fused jumper from the headlamp switch connector cavity G (GRY/BLK) to cavity H (BLK/WHT).

Do the park lamps light?

--

Go to Step 10

Go to Step 9

4 |

1. Disconnect the LCM connector C1.
2. Connect a fused jumper from the LCM connector C1 cavity C (ORN) to cavity A (PPL).

Do the park lamps light?

--

Go to Step 5

Go to Step 6

5 | Replace the LCM. Refer to Lamp Control Module Replacement . Is the repair complete? | -- | Go to Exterior Lights System Check | --
6 | Inspect for an open in CKT 256 (PPL) between the LCM and the IP fuse block. Refer to Testing for Continuity in Wiring Systems. Is CKT 256 OK? | -- | Go to Step 7 | Go to Step 11
7 | Repair the open in CKT 9 (BRN) between the IP fuse block and S204. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
8 | Repair the open in CKT 240 (ORN) between the IP fuse block and the LCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --
9 | Inspect for an open in CKT 251 (BLK/WHT) between the headlamp switch and S293. Refer to Testing for Continuity in Wiring Systems. Is CKT 251 OK? | -- | Go to Step 4 | Go to Step 11
10 | Replace the headlamp switch. Refer to Headlamp Switch Replacement . Is the repair complete? | -- | Go to Exterior Lights System Check | --
11 | Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Exterior Lights System Check | --