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)
TIRE PRESSURE MONITORING (TPM) - NORMAL
BUILD VEHICLES
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.
OPERATION
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 Remote Entry Module (SKREEM)
receives an encrypted Radio Frequency (RF) signal
from
the
transponder
key.
The
SKREEM
then
decrypts the signal and broadcasts the requested
remote commands to the appropriate modules in the
vehicle
over
the
Programmable
Communication
Interface (PCI) data bus. A valid transponder key ID
must be incorporated into the RF signal in order for
the SKREEM to pass the message on to the appro-
priate modules.
Automatic transponder key synchronization is done
by the SKREEM if a valid transponder key is
inserted into the ignition cylinder, and the ignition is
turned ON. This provides a maximum operation win-
dow for RKE functions.
Each Sentry Key Remote Entry System (SKREES)
consists of a SKREEM and a transponder key. Each
system has a secret key code unique to that system.
The
secret
key
is
electronically
coded
in
the
SKREEM and in all programmed transponder keys.
It is used for immobilization and RKE functions for
data security. In addition, each transponder key will
have a unique identification.
REMOTE KEYLESS ENTRY
After pressing the lock button on the RKE trans-
mitter, all of the door locks will lock, the illuminated
entry will turn off (providing all doors are closed),
and the VTSS (if equipped) will arm. After pressing
the unlock button, on the RKE transmitter, one time,
the driver door lock will unlock, the illuminated
entry will turn on the courtesy lamps, and the VTSS
(if equipped) will disarm. After pressing the unlock
button a second time, the remaining door locks will
unlock. The Electronic Vehicle Information Center
(EVIC) or the DRBIII
t scan tool can reprogram this
feature to unlock all of the door locks with one press
of the unlock button. If the vehicle is equipped with
the memory system, the memory message will iden-
tify which transmitter (1 or 2) sent the signal.
The SKREEM is capable of retaining up to 8 individ-
ual access codes (8 transmitters). If the PRNDL is in
any position except park, the SKREEM will disable the
RKE. The 4 button transmitter uses 1-CR2032 battery.
The minimum battery life is approximately 4.7 years
based on 20 transmissions a day at 84°F (25°C). Use
the DRBIII
t scan tool or the Miller Tool 9001 RF
Detector to test the RKE transmitter. Use the DRBIII
t
or the customer programming method to program the
RKE system. However, the SKREEM will only allow
RKE programming when the ignition is in the ON
position, the PRNDL is in park position, and the VTSS
(if equipped) is disarmed.
TIRE PRESSURE MONITORING (TPM) - NORMAL
BUILD VEHICLES
The SKREEM monitors the signals from the tire
pressure sensor/transmitters and determines if any
tire has gone below the low pressure threshold LOW
TIRE PRESSURE THRESHOLDS table.
LOW TIRE PRESSURE THRESHOLDS
SYSTEM STATUS
INDICATOR
TIRE PRESSURE
ON
172 kPa (25 PSI)
OFF
207 kPa (30 PSI)
CRITICAL AND NON-CRITICAL SYSTEM ALERTS
CRITICAL: A critical alert will be triggered when
a tire pressure has gone below a set threshold pres-
sure. The SKREEM will display “X TIRE(S) LOW
PRESSURE”. “X” will be the number of tires report-
ing low pressure. The message will display for the
duration of the current ignition cycle or until an
EVIC button is pressed. If the display is removed
without correcting the condition, it will reappear 300
seconds to warn the driver of the low pressure condi-
tion.
8Q - 4
VEHICLE THEFT SECURITY
CS
SENTRY KEY REMOTE ENTRY MODULE (Continued)
NON-CRITICAL: A non-critical alert will be trig-
gered when no signal is received from a sensor/trans-
mitter or when a sensor/transmitter low battery
condition is detected. The EVIC will display “SER-
VICE TIRE PRESS. SYSTEM.”
DIAGNOSIS AND TESTING - SENTRY KEY
REMOTE ENTRY MODULE
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.
For proper diagnosis and testing of the Sentry Key
Remote Entry Module (SKREEM), use a DRBlll
t and
refer to the proper Body Diagnostic Procedures infor-
mation.
REMOVAL
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.
(1) Open hood, disconnect and isolate the battery
negative cable.
(2) Wait two minutes for the system reserve capac-
itor to discharge before beginning any system or com-
ponent service.
(3) Remove knee blocker airbag (Refer to 8 -
ELECTRICAL/RESTRAINTS/KNEE BLOCKER AIR-
BAG - REMOVAL).
(4) Unsnap instrument panel center stack left
bezel from instrument panel assembly (Fig. 3).
Fig. 3 SKREEM - REMOVE/INSTALL
1 - IGNITION SWITCH ASSEMBLY
8 - INSTRUMENT PANEL CENTER STACK
2 - INSTRUMENT PANEL CENTER STACK
9 - IGNITION SWITCH ELECTRICAL CONNECTOR
3 - INSTRUMENT PANEL CENTER STACK RIGHT BEZEL
10 - IGNITION SWITCH
4 - SKREEM ELECTRICAL CONNECTOR
11 - SKREEM
5 - SKREEM
12 - INSTRUMENT PANEL ASSEMBLY
6 - IGNITION SWITCH ASSEMBLY MOUNTING NUTS
13 - INSTRUMENT PANEL CENTER STACK LEFT BEZEL
7 - IGNITION SWITCH ASSEMBLY
CS
VEHICLE THEFT SECURITY
8Q - 5
SENTRY KEY REMOTE ENTRY MODULE (Continued)
(5) Reach up behind the left side of the center
stack
and
disconnect
the
ignition
switch
and
SKREEM electrical connectors (Fig. 4).
(6) From
underneath
the
ignition
switch/lock
assembly, loosen the lower retaining screw (Fig. 5).
(7) Remove the two mounting nuts from the front
of the instrument panel (Fig. 5).
(8) Push the ignition switch/lock assembly inward
toward the bulkhead (Fig. 5).
(9) Remove the SKREEM mounting screw on the
ignition lock assembly and separate the SKREEM
from the ignition lock assembly (Fig. 6)
INSTALLATION
(1) Position the SKREEM on the ignition lock
housing and install the retaining screw (Fig. 6)
(2) Position the ignition switch/lock assembly up in
behind the instrument panel and push rearward (Fig.
5).
(3) Install the two mounting nuts to the front of
the instrument panel (Fig. 5).
(4) From
underneath
the
ignition
switch/lock
assembly, tighten the lower retaining screw (Fig. 5).
(5) Reach up behind the left side of the center
stack and connect the ignition switch and SKREEM
electrical connectors (Fig. 4).
(6) Position the instrument panel center stack left
bezel over retaining slots and firmly snap into place
(Fig. 3).
(7) Install the knee blocker airbag (Refer to 8 -
ELECTRICAL/RESTRAINTS/KNEE BLOCKER AIR-
BAG - INSTALLATION).
WARNING: DO NOT CONNECT THE BATTERY NEG-
ATIVE
CABLE.
(Refer
to
8
-
ELECTRICAL/RE-
STRAINTS - DIAGNOSIS AND TESTING - AIRBAG
SYSTEM)
FIRST.
FAILURE
TO
DO
SO
COULD
RESULT IN OCCUPANT PERSONAL INJURY OR
DEATH.
Fig. 4 IGNITION SWITCH/SKREEM ELECTRICAL
CONNECTOR - REMOVE/INSTALL
1 - IGNITION SWITCH
2 - IGNITION CYLINDER ASSEMBLY
3 - IGNITION CYLINDER ASSEMBLY MOUNTING NUTS/SCREW
4 - SKREEM
5 - SKREEM ELECTRICAL CONNECTOR
6 - IGNITION SWITCH ELECTRICAL CONNECTOR
8Q - 6
VEHICLE THEFT SECURITY
CS
SENTRY KEY REMOTE ENTRY MODULE (Continued)
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