Wireless Control Module (WCM) / SKREEM

WIRELESS CONTROL MODULE (WCM) /SKREEM

The receiver circuit for the TPM system is integrated into the WCM for non-remote start vehicles. For factory installed remote start vehicles, the remote start antenna is external to the WCM. In addition to Tire Pressure Monitoring System (TPMS), The WCM can also include the Remote Keyless Entry (RKE) receiver, Remote Start (if equipped), and the Sentry Key Immobilizer (SKIM) receiver. All four receivers share a number of common components. The WCM decodes the RF signals transmitted by each of the vehicle's tire pressure sensors. The decoded information is used to determine if "warning" or "fault" conditions exist within the TPM system.

The WCM communicates with the module that controls the "ISO Indicator Lamp" via the vehicle bus system.

Upon detection of a warning or fault condition, the WCM will send a request to illuminate or flash the yellow telltale. Also, upon detection of a warning or fault condition, the display module will send a request to sound the "chime". A chime will only be requested once per ignition cycle per warning or fault condition detected.

The WCM will store all warning and fault conditions, placard pressure values, low-pressure threshold values and low pressure threshold hysterisis values in memory that can be accessed through diagnostic communication. If new sensors are introduced to the vehicle, the data stored for the sensor being replaced will be deleted.

The WCM will store all wheel sensor ID's and locations and faults in memory that can be accessed through diagnostic communication. All other data values transmitted from each active wheel sensor (not the spare tire) shall be stored in the WCM memory.

The WCM automatically learns and stores new sensor IDs while driving "within 10 minutes continuously above 15 m.p.h. (24 Km/h)" after a sensor has been replaced. The learning sequence will initiate when the vehicle has been stopped for more then 20 minutes.

A new sensor ID can also be programmed directly into the WCM by using a RKE-TPM Analyzer in conjunction with a Scan Tool. Once the new sensor ID has been programmed, the RKE-TPM Analyzer can be used to update the TPMS by activating the sensor.