GM Service Manual Online
For 1990-2009 cars only

Object Number: 1839837  Size: A3

The vehicle has an electronic keyless ignition with a pushbutton start.

In order to shift out of P (Park), the vehicle must be running or in Acc. mode and the regular brake pedal must be applied.

(START): Press this button while your foot is on the brake for an automatic transmission, or while pressing in the clutch for a manual transmission, to start the engine. If the vehicle is in OFF or Retained Accessory Power (RAP) mode, the keyless access transmitter must be inside the vehicle to start the engine.

Acc. (OFF/ACCESSORY): When the engine is on or the vehicle is in accessory power mode, it is recommended that a manual transmission be placed in R (Reverse). An automatic transmission must be placed in P (Park). Then press the Acc. button to turn the engine off and place the vehicle in RAP. See "Retained Accessory Power (RAP)" later for more information. If an automatic vehicle is not correctly placed in P (Park) a SHIFT TO PARK message will display on the Driver Information Center (DIC). For more information, see DIC Warnings and Messages.

When the engine is off, press this button to place the vehicle in accessory mode. ACCESSORY MODE ON will display on the Driver Information Center (DIC). This mode allows you to use things like the radio and the windshield wipers while the engine is off. Use accessory mode if you must have the vehicle in motion while the engine is off, for example, if the vehicle is being pushed or towed.

After being in accessory mode for about 10 minutes, the vehicle will automatically enter RAP or OFF, depending on if the doors are opened or closed.