Chrysler Pacifica. Manual - part 541
DIAGNOSIS AND TESTING - VEHICLE THEFT
SECURITY SYSTEM/SENTRY KEY
IMMOBILIZER SYSTEM
Use a DRBIII
t scan tool and the proper Body
Diagnostic Procedures information for diagnosis and
testing.
SENTRY KEY REMOTE ENTRY
MODULE
DESCRIPTION
The Sentry Key Remote Entry Module (SKREEM)
(Fig. 1) and (Fig. 2) 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 (for-
merly located within the Compass Mini-Trip Com-
puter (CMTC).
NOTE: On EARLY BUILD vehicles, the SKREEM
controls the functions of the SKIM and RKE mod-
ules. On NORMAL BUILD vehicles, the SKREEM
controls the functions of the SKIM, RKE module
and TPM system. If diagnosing the TPM, use the
DRBIII
T
scan tool to determine if the SKREEM
includes TPM system functionality.
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 Com-
munication 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 module. The
SKREEM is on the PCI bus. When the operator
presses a button on the transmitter, it sends a spe-
cific request to the SKREEM. In turn the SKREEM
sends the appropriate request over the PCI Bus to
the:
• Driver Door Module (DDM) to control the driver
front door lock and unlock functions, the arming and
disarming of the Vehicle Theft Security System
(VTSS) (if equipped), and the activation of illumi-
nated entry.
• Integrated Power Module (IPM) to activate the
park lamps, the headlamps, and the horn for horn
chirp. If requested, the DDM sends a request over
the PCI Bus to the:
• Passenger Door Module (PDM) to control the
passenger front, rear driver, and rear passenger door
lock and unlock functions.
• Power Liftgate Module (PLGM) to control the
liftgate lock and unlock functions.
Fig. 1 SENTRY KEY REMOTE ENTRY MODULE
(SKREEM)
1 - ANTENNA RING
2 - SKREEM ELECTRICAL CONNECTOR
3 - SKREEM
Fig. 2 SKREEM POSITIONING
1 - IGNITION SWITCH
2 - IGNITION CYLINDER ASSEMBLY
3 - SKREEM
4 - SKREEM ANTENNA RING
CS
VEHICLE THEFT SECURITY
8Q - 3
VEHICLE THEFT SECURITY (Continued)