GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlight Diagnostic System Check?

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Go to Step 2

Go to Headlight System Check .

2

  1. Disconnect the left headlamp relay K73 and the right headlamp relay K132.
  2. Turn the ignition switch to the ON position.
  3. Take the transmission out of the PARK position.
  4. Use a DMM in order to measure the resistance in terminal 2 of the left headlamp relay K73 and terminal 6 of the right headlamp relay K132.

Is the measured resistance within the specified value?

Less than 5ohms

Go to Step 4

Go to Step 3

3

  1. Locate an open or a high resistance in CKT  M65
  2. Repair the open or the high resistance in CKT M65.

Did you complete the repair?

--

Go to Step 5

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4

  1. Replace the left headlamp relay K73.
  2. Reconnect the right headlamp relay K132.

Did you complete the repair?

--

Go to Step 5

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5

  1. Connect all connectors and components previously disconnected.
  2. Verify that the DRL system operates properly.

Does the DRL system operate properly?

--

Go to Headlight System Check

Go to Step 1