For 1990-2009 cars

### RKE Module

The RKE receiver module is located in the rear storage compartment attached to the underside of the rear shelf. The module performs the functions of interpreting the signals from the transmitter and controlling the requested vehicle function via class 2 serial data or by discreet input. The receiver module does not directly control any functions but is a interpreter for the transmitter to tell other modules what is requested. The receiver module is able to differentiate between the various transmitters and must be programmed to accept signals from all transmitters if one or both are to be replaced or spares are added.

### Transmitter

The transmitter unit is a battery powered, water resistant, radio frequency signal generator. Two transmitters are provided with each vehicle and each is uniquely recognized by the receiver module. Replacement transmitters for the vehicle may be obtained, however the receiver module must be reprogrammed to accept the new transmitter.

### Rolling Code

The keyless entry system uses a system called Rolling Code. When the transmitter and the RKE module are initially programmed, a code is established that is unique to the transmitter and the module. Each time the transmitter is used, within range of the module, a new code is used. The transmitter sends the code to the module, the module recognizes that it is from a programmed transmitter and it learns the new code.

When the transmitter goes out of synchronization with the module and you have to re-synchronize it, the module recognizes the transmitter as a programmed transmitter and establishes a new code sequence with the transmitter. Each transmitter that is programmed to the module has its own unique identification.