2004 GMC Sierra 1500 Pickup Owner's Manual - Page 117

Key Release Button (Manual Transmission) The ignition key cannot be removed from the ignition of manual transmission vehicles unless the key release button is used. Retained Accessory Power (RAP) Your vehicle may be equipped with a Retained Accessory Power (RAP) feature which will allow certain features on your vehicle to continue to work up to 10 minutes after the ignition key is turned to OFF. Your radio, power windows and overhead console will work when the ignition key is in RUN or ACCESSORY. Once the key is turned from RUN to LOCK, these features will continue to work for up to 10 minutes or until a door is opened. Starting Your Engine Automatic Transmission To remove the key on manual transmission vehicles, turn the key to ACC, then press the button and turn the key to LOCK. Do not hold the button in while turning the key to ACC. Pull the key straight out. Move your shift lever to PARK (P) or NEUTRAL (N). Your engine won't start in any other position - that's a safety feature. To restart when you're already moving, use NEUTRAL (N) only. If you have a diesel engine refer to the diesel supplement for starting procedure. Notice: Do not try to shift to PARK (P) if your vehicle is moving. If you do, you could damage the transmission. Shift to PARK (P) only when your vehicle is stopped. 2-23