GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Test the body control module (BCM) for stored DTCs. Refer to Diagnostic Trouble Code (DTC) List/Type in Body Control System.

Have all of the DTCs been cleared?

--

Go to Step  3

Go to Step  2

2

Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

--

Go to Exterior Lights System Check

--

3

Exchange the parking lamps relay with a known good relay from the underhood junction block.

Do the parking lamps turn off?

--

Go to Step  4

Go to Step  5

4

Replace the faulty relay.

Is the repair complete?

--

Go to Exterior Lights System Check

--

5

Disconnect the turn/headlamp switch assembly connector C1.

Do the parking lamps turn off?

--

Go to Step  6

Go to Step  7

6

Replace the turn/headlamp switch assembly. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Disconnect the underhood junction block connector C2.

Do the front parking lamps turn off?

--

Go to Step  8

Go to Step  9

8

Disconnect the underhood junction block connector C3.

Do the rear parking lamps turn off?

--

Go to Step  10

Go to Step  11

9

Repair the short to B+ in CKT 9 between the underhood junction block and the lit parking lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

10

Replace the underhood junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

11

Disconnect the right IP junction block connector C3.

Do all of the rear lamps turn off?

--

Go to Step  12

Go to Step  14

12

Disconnect the right IP junction block connector C2.

Do all of the interior lamps and components connected to connector C2 turn off?

--

Go to Step  13

Go to Step  14

13

Use a test lamp in order to backprobe the right IP junction block connector C2 between terminal B9 and ground.

Does the test lamp light?

--

Go to Step  15

Go to Step  16

14

Repair the short to B+ in CKT 9 between the right IP junction block and the lit interior lamps. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

15

Repair the short to B+ in CKT 9 between the right IP junction block and the underhood junction block. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

16

Replace the right IP junction block. Refer to Relay/Fuse Center Replacement in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--