GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the headlamp switch.
  2. Using a test light, backprobe between the headlamp switch harness connector A and B+.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Repair a poor connection or an open in circuit 1750 between the headlamp switch harness connector terminal A and G201.

Has the repair been made?

--

Go to Headlight System Check

--

3

Using a test light, backprobe between the headlamp switch harness connector terminal A and terminal D.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Has the repair been made?

--

Go to Headlight System Check

--

5

Using a test light, backprobe between C201 terminal A3 and ground.

Does the test light illuminate?

--

Go to Step 6

Go to Step 7

6

Repair the poor connection or the open in circuit 10 between C201 terminal A3 and S221.

Has the repair been made?

--

Go to Headlight System Check

--

7

Replace the headlamp dimmer switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle .

Has the repair been made?

--

Go to Headlight System Check

--