GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Exterior Lights System Check performed?

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Go to Step 2

Go to Exterior Lights System Check

2

  1. Remove the left position lamp deactivation relay from the rear compartment relay center 1.
  2. Place the headlamp switch in the PARK position.
  3. Measure the voltage to ground at the left position lamp deactivation relay terminal A1 (LT BLU/WHT).

Is battery voltage measured?

--

Go to Step 3

Go to Step 6

3

Measure the voltage between the left position lamp deactivation relay terminal A1 (LT BLU/WHT) and terminal B2 (PPL).

Is battery voltage measured?

--

Go to Step 4

Go to Step 7

4

Measure the voltage to ground at the left position lamp deactivation relay terminal A3 (ORN).

Is battery voltage measured?

--

Go to Step 5

Go to Step 8

5

Measure the voltage between the left position lamp deactivation relay terminal A3 (ORN) and terminal B1 (BLK).

Is battery voltage measured?

--

Go to Step 10

Go to Step 9

6

Repair the open in CKT 1426 (LT BLU/WHT) between the rear compartment relay center 3 and the rear compartment relay center 1. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

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7

Repair the open in CKT 709 (PPL) between the rear compartment relay center 1 and S144. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

8

Repair the open in CKT 57 (ORN) between the rear compartment relay center 1 and S372. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

9

Repair the open in CKT 750 (BLK) between the rear compartment relay center 1 and S107. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Exterior Lights System Check

--

10

Replace the left position lamp deactivation relay.

s the repair complete?

--

Go to Exterior Lights System Check

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