Magnum V8-5.7L VIN H (2005)
Keyless Entry Module: Description and Operation
When a PCM and the SKREEM are replaced at the same time, perform the following steps in order:
1. Program the new PCM.
2. Program the new SKREEM.
3. Replace all ignition keys and program them to the new SKREEM.
The Sentry Key Remote Entry Module (SKREEM) (3) performs the functions of what used to be the Sentry Key Immobilizer Module (SKIM), the
Remote Keyless Entry (RKE) Module, and the Tire Pressure Monitoring (TPM) System.
The SKREEM is located on and around (antenna ring) (4) the ignition key cylinder (2) along with the ignition switch (1). It is accessible only from
behind the instrument panel, to the left of the steering column. Serviceability requires lock cylinder removal to access the complete unit.
SENTRY KEY IMMOBILIZER
The Sentry Key Immobilizer System (SKIS) authenticates an electronically coded Transponder Key placed into the ignition and sends a valid/invalid key
message to the Powertrain Control Module (PCM) based upon the results. The VALID/INVALID KEY message communication is performed using a
rolling code algorithm via the Programmable Communication Interface (PCI) data bus. A VALID KEY message must be sent to the Powertrain Control
Module (PCM) within two seconds of ignition ON to free the engine from immobilization.
REMOTE KEYLESS ENTRY (RKE)
The RKE transmitter uses radio frequency signals to communicate with the SKREEM. The SKREEM is on the Controller Area Network (CAN) data bus
network. When the operator presses a button on the transmitter, it sends a specific request to the SKREEM. In turn the SKREEM sends the appropriate
request over the CAN bus to the Integrated Power Module (IPM) to activate the park lamps, the headlamps, and the horn for horn chirp.
TIRE PRESSURE MONITORING (TPM)
If equipped with the Tire Pressure Monitoring (TPM) System, each of the vehicles four wheels will have a valve stem with a pressure sensor and radio
transmitter built in. Signals from the tire pressure sensor /transmitter are received and interpreted by the SKREEM.
A sensor/transmitter in a mounted wheel will broadcast its detected pressure once per minute when the vehicle is moving faster than 15 mph (24
km/h). Each sensor/transmitter s broadcast is uniquely coded so that the SKREEM can determine the location.
SENTRY KEY IMMOBILIZER
The Sentry Key Remote Entry Module (SKREEM) receives an encrypted Radio Frequency (RF) signal from the transponder key. The SKREEM then
