Module, Radio Frequency (RF Hub): Description
The Radio Frequency Hub Module (RFHM) (2) (also known as the RF Hub/RFH) is a primary component of several standard and optional electronic systems in the vehicle. The RFHM is a Radio Frequency (RF) and Low Frequency (LF) receiver, contains controlling logic for a number of systems and communicates with other electronic modules and nodes in the vehicle over the Controller Area Network (CAN) data bus as well as over a private serial bus. There are several models of the RFHM that support NAFTA, BUX and Japan markets. Different signal supporting options include automatic transmission, manual transmission, Rotary ignition system using IGNM switch, Passive Entry Keyless go system using smart door handles and KIN switch, and remote start.
Systems and features supported by the RFHM include:
- Brake Transmission Shift Interlock (BTSI) System
- Ignition System
- Passive Entry (PE) Keyless Go (KG) Systems
- Remote Keyless Entry (RKE) System
- Remote Start System
- Sentry Key Immobilizer System (SKIS)
- Tire Pressure Monitor (TPM) System
- Vehicle Theft Alarm (VTA) System
Concealed and protected within the molded black plastic RFHM housing is the microcontroller and the other electronic circuitry of the module. The RFHM is located near the center of the shelf support behind the rear seat back and is concealed beneath the package tray interior trim. It is secured through two mounting tabs integral to the module housing to the shelf support by two plastic push-in fasteners.
Depending upon vehicle equipment, either one or two connector receptacles (1 and 3) integral to the RFHM housing are connected to the vehicle electrical system through dedicated take outs and connectors of the body wire harness. In vehicles with the optional remote start system, a remote start antenna is located adjacent to the RFHM on the shelf support and is connected directly to the RFHM through a third integral connector receptacle (2).
The RFHM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced.