Transmitter, Integrated Key Fob: Operation

The FOB with Integrated Key (FOBIK) incorporates many useful functions into a single, compact unit. The transducer on the internal circuit board of the FOBIK uses low frequency Radio Frequency (RF) communication to ensure vehicle security through an electronic validation or handshake process that is performed with the Radio Frequency Hub (RFH) each time the engine is started.

When any one of the Remote Keyless Entry (RKE) buttons of the FOBIK is depressed, the on-board transmitter of the FOBIK generates a high frequency RF request signal that is received and validated by the RFH. If the RFH determines that the RF signal was generated by a FOBIK that is valid for the vehicle, the RFH relays electronic request messages to the appropriate electronic modules in the vehicle over the Controller Area Network-Chassis (CAN-C) bus to invoke the functions or features associated with the request.

The integrated mechanical emergency key of the FOBIK provides emergency access to the vehicle in case the battery in the vehicle or the transmitter becomes discharged. The emergency key can also be retained to keep any locked on-board vehicle storage compartments such as the glove box secured, for example: While the vehicle is being attended to by a parking valet.

Each vehicle owner is provided with a four-digit Personal Identification Number (PIN) by the dealer at the time of vehicle purchase. This number is required along with a diagnostic scan tool for the dealer to program an additional or replacement FOBIK into the electronics of the vehicle. If the mechanical emergency key is included with the new, additional or replacement FOBIK The mechanical key will also need to be cut to match the coding of the lock cylinders in the vehicle.

Diagnosis of a FOBIK transmitter requires the use of a Radio Frequency Detector such as special tool (special tool #9001, Rf Detector). Refer to the appropriate diagnostic information.