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

Backprobe the rear compartment relay center connector with a DMM from cavity C1 (ORN) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 3

Go to Step 6

3

  1. Place the gear selector lever in the PARK position.
  2. Backprobe the rear compartment relay center connector with a DMM from cavity C3 (WHT) to ground.

Is the voltage within the specified range?

10-15 V

Go to Step 4

Go to Step 7

4

  1. Place the headlamp switch in the RH PARK position.
  2. Backprobe the rear compartment relay center connector with a DMM from cavity C3 (WHT) cavity D1 (DK BLU).

Is the voltage within the specified range?

10-15 V

Go to Step 5

Go to Step 8

5

Replace the POSN LP R relay in the rear compartment relay center. Refer to Wiring Repairs in Wiring Systems.

Is the POSN LP R relay replacement complete?

--

Go to Exterior Lights System Check

--

6

Repair the open in CKT 3140 (ORN) between S401 and the rear compartment relay center. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Exterior Lights System Check

--

7

Repair the open in CKT 1430 (WHT) between the rear compartment relay center connector cavity A4 and cavity C3. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Exterior Lights System Check

--

8

  1. Disconnect the headlamp switch connector.
  2. Remove the POSN LP R relay from the rear compartment relay center.
  3. Connect a DMM from the rear compartment relay center connector cavity D1 (DK BLU) to the headlamp switch connector cavity A5 (DK BLU).

Is the resistance less than the specified value?

5 ohms

Go to Step 9

Go to Step 10

9

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

--

10

Repair the open in CKT 1432 (DK BLU) between the rear compartment relay center and the headlamp switch. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Exterior Lights System Check

--