Remote Keyless Entry System

The Remote Keyless Entry (RKE) system uses non-switched battery current received through a fused B(+) to the Body Control Module (BCM) so that the system remains operational regardless of the ignition switch position. The Radio Frequency Hub (RFH) is the primary RKE system controller as well as the Radio Frequency (RF) RKE receiver. The RFH validates the vehicle access code of each RKE transmitter (also known as FOB with Integrated Key/FOBIK) from which it receives RF signal inputs. It ignores requests from any transmitter for which it has no stored vehicle access code.

The RFH communicates and shares resources with the BCM and many other electronic modules in the vehicle over the CAN data bus. The RFH also stores the RKE system Customer Programmable feature settings received over the CAN data bus from the Electronic Vehicle Information Center (EVIC). When the RFH receives an input from a valid transmitter source, it uses these settings and internal programming to send the appropriate electronic request messages to the BCM and other electronic modules over the CAN data bus to invoke the proper RKE system features and responses.

The RKE system circuits and transmitter inputs are continually monitored by the microcontroller and software contained within the RFH. When the RFH monitors a problem in any of the RKE system circuits or transmitters, it stores a Diagnostic Trouble Code (DTC) in its memory circuit. The hardwired circuits between components related to the RKE system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the RKE system or the electronic controls or communication between other modules and devices that provide features of the RKE system. The most reliable, efficient, and accurate means to diagnose the RKE system or the electronic controls and communication related to RKE system operation, as well as the retrieval or erasure of a DTC requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.