GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2001 🢒 Silhouette Ext. 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Park Lamps Inoperative

Park Lamps Inoperative Domestic

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

DEFINITION: One or all of the following park lamp are inoperative:

    • tail lamps
    • Front park lamp
    • License lamps

1

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2
  1. Place the ignition switch in the OFF position.
  2. Place the headlamp switch in the PARK position.

Are the park lamp operating properly?

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

Go to Step 3

3

Are all of the park lamp inoperative?

Go to Step 5

Go to Step 4

4

Are the tail lamps inoperative?

Go to Step 7

Go to Step 10

5
  1. Disconnect the headlamp switch connector.
  2. Using a test lamp that is connected to ground, probe the battery positive voltage circuit of the headlamp switch connector that is fed by the PARK LP fuse.

Does the test lamp illuminate?

Go to Step 6

Go to Step 12

6

Connect a fused jumper between the battery positive voltage circuit and the park lamp supply voltage circuit of the headlamp switch connector. Refer to Circuit Testing in Wiring Systems.

Do the park lamp illuminate?

Go to Step 15

Go to Step 21

7
  1. Remove the inoperative tail lamp bulb.
  2. Using a test lamp, probe the park lamp supply voltage circuit and ground circuit of the inoperative tail lamp bulb socket.

Does the test lamp illuminate?

Go to Step 14

Go to Step 8

8
  1. Disconnect the tail lamp assembly connector.
  2. Probe the park lamp supply voltage circuit of the tail lamp connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 16

9

Using a test lamp, probe between the park lamp supply voltage circuit and the ground circuit of the tail lamp connector.

Does the test lamp illuminate?

Go to Step 13

Go to Step 17

10
  1. Disconnect the inoperative park lamp.
  2. Probe the park lamp supply voltage circuit of the inoperative park lamp with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 18

11

Using a test lamp, probe between the park lamp supply voltage circuit and the ground circuit of the inoperative park lamp connector.

Does the test lamp illuminate?

Go to Step 14

Go to Step 19

12

Test for an open or high resistance in the battery positive voltage circuit of the headlamp switch that is fed by the PARK LP fuse. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 20

13

Inspect for poor connections at the harness connector of the inoperative tail lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 24

14

Inspect for poor connections at the bulb socket of the inoperative park lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 23

15

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 25

Go to Step 22

16

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

Is the repair complete?

Go to Step 25

--

17

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

Is the repair complete?

Go to Step 25

--

18

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

Is the repair complete?

Go to Step 25

--

19

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

Is the repair complete?

Go to Step 25

--

20

Repair a short to ground in battery positive voltage circuit or the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 25

--

21

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

Is the repair complete?

Go to Step 25

--

22

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

Go to Step 25

--

23

Replace the inoperative park lamp bulb.

Is the repair complete?

Go to Step 25

--

24

Replace the inoperative tail lamp assembly. Refer to Tail Lamp Replacement .

Is the repair complete?

Go to Step 25

--

25

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Park Lamps Inoperative Export

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

DEFINITION: One or all of the following park lamp are inoperative: tail lamps, headlamp position lamps, or license lamps.

1

Did you review the Exterior Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2
  1. Place the ignition switch in the OFF position.
  2. Place the headlamp switch in the PARK position.

Are the park lamp operating properly?

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

Go to Step 3

3

Are all of the park lamp inoperative?

Go to Step 7

Go to Step 4

4

Are the tail lamps inoperative?

Go to Step 5

Go to Step 14

5

Are both tail lamps inoperative?

Go to Step 6

Go to Step 9

6

Is the vehicle equipped with daytime running lamps?

Go to Step 12

Go to Step 21

7
  1. Disconnect the headlamp switch connector.
  2. Using a test lamp that is connected to ground, probe the battery positive voltage circuit of the headlamp switch connector that is fed by the PARK LP fuse.

Does the test lamp illuminate?

Go to Step 8

Go to Step 16

8

Connect a fused jumper between the battery positive voltage circuit and the park lamp supply voltage circuit of the headlamp switch connector. Refer to Circuit Testing in Wiring Systems.

Do the park lamp illuminate?

Go to Step 19

Go to Step 28

9
  1. Remove the inoperative tail lamp bulb.
  2. Using a test lamp, probe the park lamp supply voltage circuit and ground circuit of the inoperative tail lamp bulb socket.

Does the test lamp illuminate?

Go to Step 18

Go to Step 10

10
  1. Disconnect the tail lamp assembly connector.
  2. Probe the park lamp supply voltage circuit of the tail lamp connector with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 21

11

Using a test lamp, probe between the park lamp supply voltage circuit and the ground circuit of the tail lamp connector.

Does the test lamp illuminate?

Go to Step 17

Go to Step 24

12
  1. Disconnect the daytime running lamps control module connector.
  2. Using a test lamp that is connected to ground, probe the input park lamp supply voltage circuit of the daytime running lamps control module connector.

Does the test lamp illuminate?

Go to Step 13

Go to Step 23

13

Connect a fused jumper between the input park lamp supply voltage circuit and the output park lamp supply voltage circuit of the daytime running lamps control module connector. Refer to Circuit Testing in Wiring Systems.

Do the park lamp illuminate?

Go to Step 20

Go to Step 22

14
  1. Disconnect the inoperative park lamp.
  2. Probe the park lamp supply voltage circuit of the inoperative park lamp with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 15

Go to Step 25

15

Using a test lamp, probe between the park lamp supply voltage circuit and the ground circuit of the inoperative park lamp connector.

Does the test lamp illuminate?

Go to Step 18

Go to Step 26

16

Test for an open or high resistance in the battery positive voltage circuit of the headlamp switch that is fed by the PARK LP fuse. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 33

Go to Step 27

17

Inspect for poor connections at the harness connector of the inoperative tail lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 33

Go to Step 32

18

Inspect for poor connections at the bulb socket of the inoperative park lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 33

Go to Step 31

19

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 33

Go to Step 29

20

Inspect for poor connections at the harness connector of the daytime running lamps control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 33

Go to Step 30

21

Repair an open or high resistance in the park lamp supply voltage of the inoperative tail lamp(s). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 33

--

22

Repair an open or high resistance in the output park lamp supply voltage of the daytime running lamp control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 33

--

23

Repair an open or high resistance in the input park lamp supply voltage of the daytime running lamp control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 33

--

24

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

Is the repair complete?

Go to Step 33

--

25

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

Is the repair complete?

Go to Step 33

--

26

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

Is the repair complete?

Go to Step 33

--

27

Repair a short to ground in battery positive voltage circuit or the park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 33

--

28

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

Is the repair complete?

Go to Step 33

--

29

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

Go to Step 33

--

30

Replace the daytime running lamps control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the repair complete?

Go to Step 33

--

31

Replace the inoperative park lamp bulb.

Is the repair complete?

Go to Step 33

--

32

Replace the inoperative tail lamp assembly. Refer to Tail Lamp Replacement .

Is the repair complete?

Go to Step 33

--

33

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2