GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Headlight System Check performed?

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Go to Step 2

Go to Headlight System Check

2

  1. Remove the DRL relay from the underhood relay center.
  2. Connect a J 39200 digital multimeter (DMM) from pin B8 to pin A7 of the DRL relay.

Is the resistance less than the specified value?

20 ohms

Go to Step 3

Go to Step 8

3

Inspect CKT 359 (PPL) for an open between the left high beam headlamp and the DRL relay. Refer to Testing for Continuity in Wiring Systems.

Is CKT 359 OK?

--

Go to Step 4

Go to Step 6

4

Inspect CKT 11 (LT GRN) for an open between the left high beam headlamp and the connector C104. Refer to Testing for Continuity in Wiring Systems.

Is CKT 11 OK?

--

Go to Step 5

Go to Step 6

5

Inspect CKT 711 (DK GRN/WHT) for an open between the connector C104 and the underhood fuse block. Refer to Testing for Continuity in Wiring Systems.

Is CKT 711 OK?

--

Go to Step 7

Go to Step 6

6

Repair the open in the appropriate circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Headlight System Check

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7

Repair the open in CKT 750 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Headlight System Check

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8

Replace the DRL relay.

Is the DRL relay replacement complete?

--

Go to Headlight System Check

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