GM Service Manual Online
For 1990-2009 cars only

Your vehicle may have a Lane Departure Warning (LDW) system. Read this entire section before using the system.

Caution: The Lane Departure Warning (LDW) system does not steer the vehicle and is only an aid to help you stay in your driving lane. The LDW system may not:

   • Provide you with enough time to avoid a lane change collision.
   • Be loud enough for you to hear the warning beeps.
   • Work properly under bad weather conditions or if the windshield is not kept clean.
   • Detect lane markings and will not detect road edges.
   • Warn you that your vehicle is crossing a lane marking if the system does not detect the lane marking.
LDW will indicate the system is working whenever it detects either the left or right lane marking. So if you depart on the side of the lane that LDW is not detecting, LDW will not warn you.

If you do not carefully maintain your vehicle position within the lane, vehicle damage, injury, or death could occur. Even with LDW, always keep your attention on the road and maintain proper vehicle position within the lane. Always keep the windshield clean and do not use LDW in bad weather conditions.

When you cross a detected lane marking, the LDW symbol will flash and you will hear three beeps. LDW will not warn you if your turn signal is on or if you make a sharp maneuver. Before making a lane change, check your vehicle's mirrors, glance over your shoulder for vehicles and hazards, and start your turn signal before changing lanes.

How the System Works

LDW uses a camera located between the inside rearview mirror and the windshield to detect the lane markings.

(Lane Departure Warning): To turn LDW on and off, press the CONFIG hard key. Press the symbol screen button to turn it on and off. The symbol will be highlighted when the feature is active.


Object Number: 1794024  Size: A2

When the vehicle is started, the LDW symbol, located in the instrument panel cluster, will briefly come on to indicate that the light is operational.

LDW only operates at speeds of 35 mph (56 km) or greater. If LDW is turned on when traveling at these speeds, the LDW symbol will appear green if the system detects a left or right lane marking. This symbol will change to amber and flash and three beeps will sound if you cross a detected lane marking without using your turn signal.

If the LDW symbol does not appear, LDW is not currently operating and will not warn you.

When the System Does Not Seem To Work Properly

The LDW symbol will not appear when the system is having difficulty seeing the lines on the road or if the view of the camera on the windshield is blocked with mud, dirt, snow, ice, or slush, if the windshield is damaged, or when weather limits visibility, such as while driving in fog, rain, or snow conditions. This is normal operation, your vehicle does not need service. For cleaning instructions, see "Washing Your Vehicle" in the Index of your vehicle's owner manual.

LDW warnings may occasionally occur due to tar marks, shadows, cracks in the road, or other road imperfections. This is normal system operation, your vehicle does not need service.

LDW Error Message

SERVICE LANE DEPARTURE SYSTEM: This message may appear in the DIC to indicate that LDW is not working properly. If this message remains on after continued driving, the system needs service. Take your vehicle to your dealer/retailer. See "DIC Warnings and Messages" in the Index of your vehicle's owner manual for more information.

LANE DEPARTURE SYSTEM UNAVAILABLE : This message may appear in the DIC if LDW does not activate due to a temporary condition. See "DIC Warnings and Messages" in the Index of your vehicle's owner manual for more information.