GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Turn off the IP dimmer switch.
  2. Turn off the left and right roof rail courtesy/ready lamps.
  3. Turn off the windshield header courtesy/reading lamps.
  4. Turn the ignition switch to the RUN position.
  5. Lower the driver's door window in order to prevent lockout.
  6. While observing the courtesy lights, open and close all the vehicle doors, one door at a time.
    • The courtesy lights turn on when any door is open.
    • The courtesy lights turn off when all doors are closed.

2

  1. Close all the vehicle doors.
  2. While observing the courtesy lights, turn the IP dimmer switch to the DOME position.
  3. Turn off the IP dimmer switch.
    • The courtesy lights turn on when the IP dimmer switch is in the DOME position.
    • The courtesy lights turn off when the IP dimmer switch is off.

Courtesy Lamps Inoperative with Instrument Panel Dimmer Switch

3

  1. Turn the ignition switch to the OFF position.
  2. Open a vehicle door for at least 5 seconds, then close the door.
  3. Observe the courtesy lights.
    • Delayed illumination feature enabled (interior lighting modes 2 and 4: The courtesy lights turn on for 25 seconds, then turn off after the last door is closed.
    • Delayed illumination feature disabled (interior lighting modes 1 and 3: The courtesy lights turn off after the last door is closed.

Personalization Mode Inoperative

4

  1. Make sure the ignition switch is in the OFF position.
  2. Turn the IP dimmer switch to the DOME position for at least 10 minutes.

When any of the interior lights are left on for more than 10 minutes with the ignition switch in the OFF position, the interior lights turn off.

Note: On vehicles with less than 15 total accumulated miles, the interior lights turn off after 3 minutes instead of 10 minutes.

Courtesy Lamps Always On

5

  1. Turn the ignition switch from OFF to RUN, then back to OFF.
  2. Open a vehicle door for at least 5 seconds, then close all the vehicle doors.
  3. While observing the courtesy lights, turn the ignition switch to the RUN position within 25 seconds after the last door is closed.
  4. Turn the ignition switch to the OFF position.
  5. Open a vehicle door for at least 5 seconds, then close all the vehicle doors.
  6. While observing the courtesy lights, press any power door lock switch to the LOCK position within 25 seconds after the last door is closed.
    • Interior Lighting Modes 2 and 4: The delayed illumination feature cancels, turning off the courtesy lights, when the ignition switch is turned to the RUN position, or when pressing LOCK on a power door lock switch.
    • Interior Lighting Modes 1 and 3: The delayed illumination feature is disabled, so the courtesy lights turn off when the last door is closed.

Personalization Mode Inoperative

6

  1. Close all the vehicle doors.
  2. Turn the ignition switch from OFF to RUN, then back to OFF.
  3. While observing the courtesy lights, remove the key from the ignition switch.
    • Exit lighting feature enabled (interior lighting modes 3 and 4: The courtesy lights turn on for 25 seconds upon removing the key from the ignition switch.
    • Exit lighting feature disabled (interior lighting modes 1 and 2: The courtesy lights stay off upon removing the key from the ignition switch.

Personalization Mode Inoperative

7

  1. If the vehicle is not equipped with content theft deterrent (RPO UA6), skip to step 8.
  2. Remove the key from the ignition switch.
  3. Lock and close all the vehicle doors.
  4. Insert the key in the driver's door key cylinder lock. Note: This test also works on the passenger's door key cylinder lock.
  5. While observing the courtesy lights, turn the key to unlock the door. Hold the key in the unlock position for one second.

The courtesy lights turn on for 40 seconds upon unlocking the door with the key.

Courtesy Lamps Inoperative with Unlock of Left Front Door

8

  1. If the vehicle is not equipped with keyless entry system (RPO AU6), skip to step 9.
  2. Remove the key from the ignition switch.
  3. Close all the vehicle doors.
  4. While observing the courtesy lights, press UNLOCK on the keyless entry transmitter.
  5. Wait 40 seconds.
  6. While observing the courtesy lights, press UNLOCK on the keyless entry transmitter again.
  7. Within 40 seconds after pressing UNLOCK, press LOCK on the keyless entry transmitter.
    • The courtesy lights turn on for 40 seconds upon pressing UNLOCK on the keyless entry transmitter.
    • During the 40 second illumination period, the courtesy lights turn off when pressing LOCK on the keyless entry transmitter.

Courtesy Lamps Inoperative with Transmitter

9

  1. Close all the vehicle doors.
  2. Turn off the IP dimmer switch.
  3. Turn the ignition switch to the RUN position.
  4. Turn on, then turn off the switches for the windshield header courtesy/reading lamps.
    • The windshield header courtesy/reading lamps turn on when switches are on.
    • The windshield header courtesy/reading lamps turn off when switches are off.

10

  1. Close all the vehicle doors.
  2. Turn off the IP dimmer switch.
  3. Turn the ignition switch to the RUN position.
  4. Turn on, then turn off the switches for the left and right roof rail courtesy/reading lamps.
    • The left and right roof rail courtesy /reading lamps turn on when the switches are on.
    • The left and right roof rail courtesy/reading lamps turn off when the switches are off.

11

Open, then close the left and right sunshade illuminated mirror covers while observing the mirror lamps.

    • The left and right sunshade illuminated mirror lamps turn on with the mirror cover open.
    • The left and right sunshade illuminated mirror lamps turn off with the mirror cover closed.

12

Open, Then close the IP compartment while observing the IP compartment lamp.

    • The IP compartment lamp turns on when the IP compartment is open.
    • The IP compartment lamp turns off when the IP compartment is closed.

13

Open, then close the rear compartment lid while observing the rear compartment courtesy lamp.

    • The rear compartment courtesy lamp turns on when the rear compartment lid is open.
    • The rear compartment courtesy lamp turns off when the rear compartment is closed.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.