Keyless Entry: Description and Operation

REMOTE KEYLESS ENTRY SYSTEM
The Remote Keyless Entry (RKE) system consists of the RKE key fob radio transmitter and an RKE module that contains a radio receiver and the program logic. The RKE module is installed in an RKE mini-dome lamp housing on the headliner of the vehicle, or in the housing of the optional overhead console, depending upon how the vehicle is equipped.

The RKE system for this vehicle also features a customer programmable horn chirp feature. This feature allows the customer the option of enabling or disabling the horn chirp request that the RKE receiver issues as an audible indication that a valid Lock signal has been received from the RKE transmitter. For more information on programing this feature, (Refer to POWER LOCKS/REMOTE KEYLESS ENTRY MODULE - STANDARD PROCEDURE - REMOTE KEYLESS ENTRY MODULE PROGRAMMING).

The RKE system can retain the vehicle access codes of up to four transmitters. The transmitter codes are retained in memory, even if the battery is disconnected. If a transmitter is faulty or lost, new transmitter vehicle access codes can be programmed into the system using a DRB III scan tool. Refer to the appropriate diagnostic information.

The Remote Keyless Entry (RKE) system is a radio frequency system that allows the use of a remote battery-powered radio transmitter to control the power lock system. On vehicles with the RKE option, the power locks can be operated by depressing the Lock or Unlock buttons of the RKE transmitter. The RKE system includes an illuminated entry feature, which turns ON the courtesy lamps for a timed interval (about thirty seconds) when the vehicle is unlocked using the RKE transmitter.

Refer to the owner's manual in the vehicle glove box for more information on the features, use and operation of the RKE system.

REMOTE KEYLESS ENTRY (RKE)
The Remote Keyless Entry (RKE) module is in the overhead console or in the dome lamp assembly. It operates on a HF signal, which makes it less dependent on the aiming of the transmitter. When an unlock signal is received (from a transmitter), the module will ground the unlock control circuit, therefore actuating the passenger door module and at the same time grounding the courtesy lamps driver circuit, actuating the illuminated entry. The RKE module is capable of retaining four individual vehicle access codes (four transmitters). This system incorporates a rolling code feature. A horn chirp feature is also part of this system and is customer programmable.

The RKE module has some DRB III functions. The Door Lock, Door Unlock, Horn and Illuminated Entry can be actuated. The horn and illuminated entry activation time is adjustable using the DRB III. The DRB III can also turn the horn chirp and illuminated entry ON and OFF.

The XJ will be shipped with the horn chirp enabled. It can be deactivated manually using the following procedure: Press and hold the LOCK button on the transmitter for 5-10 seconds, and then while the LOCK button is pressed, press and release the UNLOCK button. The horn chirp feature can be reactivated by repeating the procedure.

Programming An RKE Transmitter
Programming a transmitter can be accomplished using the DRB III. Using the DRB III select "Theft Alarm," "VTSS" (even though "Vehicle Theft Security System" is not available for this vehicle) then "Miscellaneous" then "Programming RKE". Select a transmitter (1 - 4). The locks will cycle to verify you are in programming mode. Press the unlock button on the transmitter. The locks will cycle again to verify programming has taken place. When you program to a position, that code will overwrite the code that was in that position and because you have no way of knowing if a valid code was there or not, it is recommended that whenever it is necessary to program a transmitter, all transmitters that are to be used with that vehicle should be programmed at that time.

Synchronization (Rolling Code) Button Transmitters
The transmitter will go out of synchronization if the button is pressed more than 128 times outside of the range of the receiver. In other words the transmitter will not unlock the doors. The transmitter will go out of synchronization if the batteries are removed and replaced. To synchronize the code of the particular transmitter with the receiver, press and hold the "lock" button while within the receiver range.