Description And Operation: Description

The Radio Frequency Hub Module (RFHM) (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:

• Ignition System 
• Passive Entry (PE) Keyless Go (KG) Systems 
• Remote Keyless Entry (RKE) System 
• Sentry Key Immobilizer System (SKIS) 
• Steering Lock Mechanism 
• Tire Pressure Monitor (TPM) System 

Concealed and protected within the molded plastic RFHM housing is the microcontroller and the other electronic circuitry of the module. The RFHM is mounted on the steering column, and is secured with the use of a bracket over the steering column securing it in place.

Two connector receptacles integral to the RFHM housing are connected to the vehicle electrical system through dedicated take outs and connectors of the body wire harness.

The RFHM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced.