2004 GMC Sierra 1500 Pickup Owner's Manual - Page 234

REDUCED ENGINE POWER This message is displayed when the cooling system temperature gets too hot and the engine further enters the engine coolant protection mode. See Engine Overheating on page 5-36 for further information. SERVICE BRAKE SYSTEM If there is a problem with the brake system, this message will be displayed on the DIC. If this message appears, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed, or appears again when you begin driving, the brake system needs service. RIGHT REAR DOOR AJAR (Crew Cab) If the passenger's side rear door is not fully closed, this message will appear on the display and you will hear a chime. Stop and turn off the vehicle, check the door for obstacles, and close the door again. Check to see if the message still appears on the DIC. Press the select button to acknowledge the message and clear it from the DIC display. SERVICE BRAKE BOOSTER If your vehicle has vaccum assist power brakes, this message will be displayed on the DIC when there is a problem with the Supplemental Brake Assist system. If the message is displayed immediately after starting the vehicle or the message appears while driving, your Supplemental Brake Assist system needs service. See Brake System Warning Light on page 3-43. SERVICE AIRBAG If there is a problem with the air bag system, this message will be displayed on the DIC. Have a qualified technician inspect the system for problems. Press the select button to acknowledge the message and clear it from the DIC display. 3-70