For 1990-2009 cars

• | Synchronization may be necessary due to the security method used by the remote keyless entry system.

| The transmitter does not send the same signal twice to the remote control door lock receiver (RCDLR).

• | The RCDLR will not respond to a signal that has been sent previously.

| This prevents anyone from recording and playing back the signal from the transmitter.

• | Synchronization may be necessary under the following conditions:

- | The battery in the transmitter is very weak.

- | The battery in the transmitter was replaced.

- | The battery in the vehicle has been in a low or no charge condition for an extended period of time.

In order to synchronize the transmitter with the RCDLR, perform the following steps:

1. Stand within 1.5 m (5 ft) from the vehicle.
2. Simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for 7 seconds.

The horn should chirp in order to confirm synchronization.