GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Regal (China) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Park Lamps Inoperative

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2
  1. Turn the ignition to the OFF position.
  2. Turn the headlamp switch to the PARK position.

Do the park lamps operate properly?

Go to Step 3

Go to Step 5

3
  1. Turn the ignition to the ON position.
  2. Turn the headlamp switch to the OFF position.
  3. Cover the ambient light sensor.

Do the headlamps operate properly?

Go to Step 4

Go to Headlamps Inoperative in Low Light Conditions

4

Do the parklamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 18

5

Is only one of the parking lamps inoperative?

Go to Step 9

Go to Step 6

6

Are all the park lamps inoperative?

Go to Step 13

Go to Step 7

7

Are all the headlamp position lamps inoperative?

Go to Step 11

Go to Step 8

8

Are the license lamps and the tail lamps inoperative?

Go to Step 12

Go to Step 17

9
  1. Remove the inoperative park lamp bulb.
  2. Connect a test lamp between the park lamp supply voltage circuit of the inoperative park lamp connector and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 22

10

Connect a test lamp between the ground circuit of the inoperative park lamp connector and the park lamp supply voltage circuit of the inoperative park lamp connector.

Does the test lamp illuminate?

Go to Step 30

Go to Step 23

11

Check the FRT PARK LPS fuse for an open.

Is the FRT PARK LPS fuse open?

Go to Step 24

Go to Step 16

12

Check the TAIL LAMPS, LIC LAMPS fuse for an open.

Is the TAIL LAMPS, LIC LAMPS fuse open?

Go to Step 25

Go to Step 21

13

Check FUSE 30 for an open.

Is FUSE 30 open?

Go to Step 26

Go to Step 14

14
  1. Disconnect the headlamp switch.
  2. Probe the battery positive voltage circuit of the headlamp switch with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 27

15
  1. Connect the headlamp switch.
  2. Turn the headlamp switch to the PARK position.
  3. Carefully backprobe the park lamp supply voltage circuit of the headlamp switch connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 28

Go to Step 29

16

Test the park lamps supply voltage circuit of the headlamp position lamps for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 32

Go to Step 20

17

Test the park lamps supply voltage circuit of the license lamps for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 32

Go to Step 19

18

Test the park lamps control circuit of the automatic headlamp control module for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 32

Go to Step 31

19

Repair a high resistance or an open in the ground circuit of the license lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

20

Repair a high resistance or an open in the ground circuit of the headlamp position lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

21

Repair the high resistance or open in the park lamp supply voltage circuit of the tail lamps and license lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

22

Repair the high resistance or open in the park lamp supply voltage circuit of the inoperative park lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

23

Repair the high resistance or open in the ground circuit of the inoperative park lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

24

Repair the short to ground in the park lamps supply voltage circuit of the headlamp position lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

25

Repair the short to ground in the park lamps supply voltage circuit of the tail lamps or license lamps. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

26
  1. Repair the short to ground one of the following circuits:
    2. • The battery positive feed circuit of the park lamp relay, headlamp switch, or headlamp relay
    • The park lamp supply voltage circuit
  2. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

27

Repair the high resistance or open in the battery positive feed circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

28

Repair the high resistance or open in the park lamps supply voltage circuit of the headlamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 32

--

29

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 32

--

30

Replace the inoperative park lamp bulb. Refer to the appropriate procedure:

    • Refer to License Lamp Bulb Replacement
    • Refer to Repeater Lamp Replacement
    • Refer to Tail Lamp Bulb Replacement

Did you complete the replacement?

Go to Step 32

--

31

Replace the automatic headlamp control module. Refer to Headlamp Control Module Replacement .

Did you complete the replacement?

Go to Step 32

--

32

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2