GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 DeVille 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Power Door Locks System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Move the left front door lock switch to the LOCK position.
  2. Move the left front door lock switch to the UNLOCK position.
  3. Move the right front door lock switch to the LOCK position.
  4. Move the right front door lock switch to the UNLOCK position.
    • All of the doors lock and remain locked when a lock switch is pressed.
    • All of the doors unlock and remain unlocked when an unlock switch is pressed.

2
  1. On four-door models, move each of the rear door lock switches to the LOCK position.
  2. On four-door models, move each of the rear door lock switches to the UNLOCK position.
    • All of the doors lock and remain locked when a lock switch is pressed.
    • All of the doors unlock when a lock switch is pressed.

3

Use the door key in order to unlock either door.

Unlock the other door by holding the key in the turned position for a few seconds or by quickly rotating the door key twice in the lock cylinder.

All of the doors unlock and remain unlocked.

Power Door Locks Key Cylinder Unlock Feature Inoperative

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