Radio Frequency Hub (RFH) Module

The RFH, along with the BCM, is the primary RKE system controller. It is connected to a fused B(+) circuit and has a path to a clean ground at all times. These connections allow it to remain functional regardless of the ignition switch status. Any input to the RFH that controls a vehicle system function that does not require that the ignition switch to be ON such as depressing a button on an key fob, prompts the RFH to wake up and transmit on the CAN data bus.

The RFH marries itself to the BCM and PCM with an Immobilizer Access Code using a high security encryption system at first key on in the assembly plant.

The RFH is hardwired to the vehicle's smart door handles and multiple LF antennas for purposes of providing PEKG functionality. If the Smart door handles or exterior release switches are activated, the RFH signals the five LF antennas. The LF antenna wakes up the key fob then sends the challenge to confirm if it is the correct key, the key fob will respond with the RF with the challenge response. When a valid key fob is recognized by the RFH a CAN-Chassis (CAN-C) data bus message is sent to BCM to lock or unlock the vehicle by the RFH. When a keyfob responds with a RF signal, the LED indicator on the keyfob blinks.

Inputs

• Key Fob requests
• Key fob challenge message responses
• BCM encryption security authentication
• PCM encryption security authentication
• Smart Door Handle inputs
• LF antenna UHF inputs
• Remote start antenna's RF signal
• PE hard-wire smart handle state
• Uconnect® requests, authorization code and FOB number signals
• BCM vehicle specific configuration parameters
• BCM commanded ignition state
• BCM remote start active signal
• Air Suspension Control Module (ASCM) remote lowering status
• Vehicle speed from the ABS module
• Date and time inputs from the Radio

Outputs

• LF antennas for key fob challenges
• Wake key fob output
• BCM and PCM authentication challenges
• BCM for lock or unlock requests
• Requests to the BCM and IPC complaint to the customer programmable features.
• Power and ground to the door handle integrated circuit
• Random generated authentication number to the Uconnect® Radio
• Exciter signal for the PE smart handles
• PE enable signal