2004 Pontiac Sunfire Owner's Manual - Page 73

Resynchronization Your remote keyless entry system is equipped with a security system that prevents anyone from recording and playing back your signal. The transmitter does not send the same signal twice to the receiver. The receiver will not respond to a signal that has been sent to it more than once. Normally, the transmitter and receiver resynchronize automatically. However, under certain circumstances, manual resynchronization may be required. To resynchronize your transmitter and receiver, follow these directions: 1. Stand close to your vehicle. To replace the battery in the transmitter: 1. Use a coin or similar object to separate the bottom half from the top half of the transmitter. 2. Remove the battery and replace it with the new one. Make sure the positive side of the battery faces down. For battery replacement, use a three-volt battery, type CR2032, or equivalent. 3. Read the instructions inside the case. 4. Put the two halves back together. Make sure the cover is on tightly, so water won't get in. 5. Check the operation of the transmitter with your vehicle. If the transmitter does not work, try resynchronizing the transmitter with the receiver. 2. Press and hold the LOCK and UNLOCK buttons on the transmitter at the same time. 3. Hold the buttons for at least 10 seconds. During this time, the doors should lock and unlock once. This confirms the resynchronization. If the doors do not lock and unlock, see your dealer for service. 2-7