SENTRY KEY IMMOBILIZER SYSTEM
The Sentry Key Immobilizer System (SKIS) includes the following major components, which are described in further
detail elsewhere in this service manual:
•
Powertrain Control Module (PCM)
•
Sentry Key REmote Entry Module (SKREEM)
•
Sentry Key Transponder
•
SKIS Indicator
Except for the Sentry Key transponders, which rely upon Radio Frequency (RF) communication, hard wired circuitry
connects the SKIS components to the electrical system of the vehicle. Refer to the appropriate wiring information.
OPERATION
VEHICLE THEFT SECURITY SYSTEM
The ElectroMechanical Instrument Cluster (EMIC) is used on this model to control and integrate many of the func-
tions and features included in the Vehicle Theft Security System (VTSS). In the VTSS, the EMIC/CCN receives
inputs indicating the status of the door ajar switches, the liftgate ajar switch and the ignition switch. The EMIC will
process the information from all of these inputs, internally control the security indicator as appropriate, and send
electronic messages to the Front Control Module (FCM) over the Controller Area Network (CAN) data bus. The FCM
internally controls the output to the hazard warning lamps and sends a control output to energize or de-energize the
horn relay as appropriate.
Following are paragraphs describing the operation of each of the VTSS features.
ENABLING
The EMIC must have the VTSS function electronically enabled in order for the VTSS to perform as designed. The
logic in the EMIC keeps its VTSS function dormant until it is enabled using a diagnostic scan tool. The VTSS func-
tion of the EMIC is enabled on vehicles equipped with the VTSS option at the factory, but a service replacement
EMIC must be VTSS-enabled by the dealer using a diagnostic scan tool. Refer to the appropriate diagnostic infor-
mation.
ARMING
Passive arming of the VTSS occurs when the vehicle is exited with the key removed from the ignition switch, the
headlamps are turned off, and the doors are locked while they are open using the power lock switch. Active arming
occurs when the “Lock” button on the Remote Keyless Entry (RKE) transmitter is depressed to lock the vehicle. For
active arming to occur, the doors must be closed and the ignition switch must be in the Off position when the RKE
transmitter “Lock” button is depressed. The power lock switch will not function if the key is in the ignition switch or
the headlamps are turned on with the driver side front door open.
Pre-arming of the VTSS is initiated when a door or the liftgate is open when the vehicle is locked using a power
door lock switch or when the RKE transmitter “Lock” button is depressed. Pre-arming will not occur if the key is in
the ignition switch or the headlamps are turned on with the driver side front door open. When the VTSS is pre-
armed, the arming sequence is delayed until all of the doors and the liftgate have been closed. The VTSS will
remain in “Pre-Armed” mode for up to seventeen seconds after all doors and the liftgate have been closed.
Once the VTSS begins the passive or active arming sequence, the security indicator in the instrument cluster will
flash rapidly for about seventeen seconds. This indicates that VTSS arming is in progress. If the ignition switch is
turned to the On position, a door or the liftgate is opened, a door or the liftgate is unlocked by any means, or the
RKE “Panic” button is depressed during the seventeen second arming process, the security indicator will stop flash-
ing and the arming process will abort. Once the seventeen second arming sequence is successfully completed, the
security indicator will flash at a slower rate, indicating that the VTSS is armed.
DISARMING
Disarming of the VTSS is only possible if the vehicle is equipped with the optional Sentry Key Immobilizer System
(SKIS). On vehicles with SKIS, turning the ignition switch to the On position using a valid SKIS key will passively
disarm VTSS. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the “Unlock” button
of the RKE transmitter. Once the alarm has been activated, either disarming method will also deactivate the alarm.
Depressing the “Panic” button on the RKE transmitter will not disarm the VTSS.
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VEHICLE THEFT SECURITY - SERVICE INFORMATION
WK