GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

Disconnect the headlamp switch connector.

Do the park and tail lamps turn off?

--

Go to Step 6

Go to Step 3

3

Disconnect the dash integration module (DIM) connector C2.

Do the park and tail lamps turn off?

--

Go to Step 7

Go to Step 4

4

Disconnect the dash integration module (DIM) connector C1.

Do the park and tail lamps turn off?

--

Go to Step 9

Go to Step 10

5

Replace the rear junction block. Refer to Rear Junction Block Replacement.

Is the rear junction block replacement complete?

--

Go to Exterior Lights System Check

--

6

Replace the headlamp switch. Refer to Headlamp Switch Replacement in Instrument Panel, Gauges and Console.

Is the headlamp switch replacement complete?

--

Go to Exterior Lights System Check

--

7

Repair the short to ground in CKT 301 (BRN/WHT). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Exterior Lights System Check

--

8

Replace the dash integration module (DIM). Refer to Body Control Module Replacement in Body Control System.

Is the DIM replacement complete?

--

Go to Exterior Lights System Check

--

9

Backprobe CKT 1080 (WHT) with a DMM from the DIM connector C1 cavity B5 (WHT) to ground.

Is the resistance less than the specified value?

0.5 ohms

Go to Step 11

Go to Step 8

10

Replace the PRK LP Relay. Refer to Relay Replacement in Wiring Systems.

Do the park and tail lamps turn off?

--

Go to Exterior Lights System Check

Go to Step 5

11

Repair the short to ground in CKT 1080 (WHT). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Exterior Lights System Check

--