GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check the HD LPS MAXI circuit breaker.

Is the circuit breaker open?

--

Go to Step 2

Go to Step 3

2

Repair a short to ground in circuit 442.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

3

Using a test light, backprobe the headlamp switch harness connector terminal N to ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair a poor connection or an open in circuit 442.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

5

Using a test light, backprobe the headlamp switch harness connector terminal L to ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

7

Using a test light, backprobe the connector C201 terminal E7 to ground.

Does the test light illuminate?

--

Go to Step  9

Go to Step 8

8

Repair the poor connection or an open in circuit 10 between the headlamp switch terminal L and C201 terminal E7.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--

9

Replace the headlamp dimmer switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Has the repair been made and the system rechecked?

--

Go to Headlight System Check

--