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 relaying the information to the requested module function via class 2 bus. 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 added.

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. The receiver module is capable of recognizing up to four transmitters. Replacement or spare transmitters for the vehicle may be obtained, however the receiver module must be reprogrammed to accept the new transmitter.

This system allows one transmitter to be matched to as many different factory equipped RKE Cadillacs as the owner chooses. Each car, however, can only have two transmitters matched to it. To program several cars to one transmitter, follow the reprogramming procedure for each of the vehicles using the desired same transmitter. (Note: If two cars are matched to one transmitter, care should be taken when cars are parked near each other). Each vehicle has two transmitters labeled transmitter #1 and transmitter #2. Each transmitter is recognized individually by the receiver and sets programmable features to the correct setting for each transmitter.

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 thereafter when 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.