GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The dome lamp does not operate with the interior lights dimming control, but it operates with when the doors are opened

1

Review the dome lamp operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the dome lamps with the IP dimming switch (which is part of the headlamp switch).

Does the system operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Disconnect the connector at the headlamp switch.
  2. Test continuity between the headlamp switch connector cavity R and ground.

Is continuity present?

--

Go to Step 4

Go to Step 5

4

Repair the open between the headlamp switch connector cavity R and ground.

Did you complete the repair?

--

Go to Step 8

--

5

  1. Disconnect the connector at the headlamp switch.
  2. Adjust the instrument panel dimmer switch adjustment knob to the dome lamp position.
  3. Test the headlamp switch continuity between terminal M and terminal R.

Is continuity present?

--

Go to Step 7

Go to Step 6

6

Replace the headlamp switch.

Did you complete the repair?

--

Go to Step 8

--

7

Repair the open circuit CKT 156 (WHT) between splice S226 and the headlamp switch.

Did you complete the repair?

--

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3