Keyless Entry: Description and Operation

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 RF 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 DRBIII (R) functions, actuators, read switch states, and RF signal status. The Door Lock, Door Unlock, Horn and Illuminated Entry lights cab be actuated. The horn and illuminated entry activation time is adjustable using the DRBIII (R). The DRBIII (R) will read the switch status of the door lock switch and door unlock switch (opened/closed), the RF signal (valid/invalid) RF checksum, Programmed/Non-programmed RF transmitter, and the In-Sync/Out-of-Sync transmitter. The D.B. 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.

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 power locks are unlocked using the RKE transmitter.

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. See Remote Keyless Entry Receiver Programming for more information on this feature.

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 scan tool and the proper Diagnostic Procedures.

The RKE system consists of the remote key fob transmitter and a radio receiver with program logic. The RKE receiver is installed in an RKE housing on the headliner of the vehicle, or in the housing of the optional overhead console, depending upon how the vehicle is equipped.

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