See also:

OnStar Personal Identification Number (PIN)
A PIN is needed to access some of the OnStar services, like Remote Door Unlock and Stolen Vehicle Assistance. You will be prompted to change the PIN the first time when speaking with an Advi ...

Ignition Transmission Lock Check
While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position. • The ignition should turn to LOCK/OFF only when the shift lever is in P (Park). ...

Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps
A. Back-Up Lamp B. Turn Signal Lamp To replace one of these lamps: 1. Open the trunk. See Trunk. 2. Remove the fasteners and pull back the trunk trim. 3. Remove the four plastic wing nuts h ...