2003 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 107

Passlock* Your vehicle is equipped with the Passlock@ theft-deterrent system. Passlock@is a passive theft-deterrent system. Passlock@ enables fuel if the ignition lock cylinder is turned with a valid key. If a correct key is not used or the ignition lock cylinder is tampered with, fuel is disabled. If the engine is running and the security light comes on, you will be able to restart the engine if you turn the engine off. However, your Passlock@ system is not working properly and must be serviced by your dealer. Your vehicle is not protected by Passlock@ at this time. You may also want to check the fuse (see Fuses and Circuit Breakers on page5-1 11.) See your dealer for In an emergency, call the GM Roadside Assistance Center. See Roadside Assistance Program on page 7-6 under Customer Assistance Information. If the engine stalls and the security light flashes, wait until the light stops flashing before trying to restart the engine. Remember to release the key from START as soon as the engine starts. 2-20