Chrysler PT Cruiser, Service & Repair Manual, Page: 519 / 2078

(4) Install the liftgate trim panel (Refer to 23 -
BODY/DECKLID/HATCH/LIFTGATE/TAILGATE/
TRIM PANEL - INSTALLATION).
(5) Connect the battery negative cable (Fig. 1).
(6) Close hood.
(7) Verify vehicle and system operation.
SKIS INDICATOR LAMP
DESCRIPTION
The Sentry Key Immobilizer System (SKIS) uses
the Vehicle Theft Security System (VTSS) indicator
LED to give an indication when the SKIS is faulty or
when the vehicle has been immobilized due to the
use of an invalid ignition key. The LED is controlled
by the instrument cluster circuitry based upon mes-
sages received from the Sentry Key Immobilizer
Module (SKIM).
OPERATION
The SKIM sends messages to the instrument clus-
ter, to turn the LED on for about three seconds when
the ignition switch is turned to the ON position as a
bulb test. After completion of the bulb test, the SKIM
sends PCI bus messages to keep the LED off for a
duration of about one second. Then the SKIM sends
messages to the instrument cluster circuitry to turn
the LED on or off based upon the results of the SKIS
self-tests. If the VTSS indicator LED comes on and
stays on after the bulb test, it indicates that the
SKIM has detected a system malfunction and/or that
the SKIS has become inoperative. If the SKIM
detects an invalid key when the ignition switch is
turned to the ON position, it sends messages to the
instrument cluster to flash the VTSS indicator LED.
The SKIM can also send messages to the instru-
ment cluster to flash the LED and to generate a sin-
gle audible chime tone. These functions serve as an
indication to the customer that the SKIS has been
placed in its “Customer Learn” programming mode.
See Sentry Key Immobilizer System Transponder
Programming in this group for more information on
the “Customer Learn” programming mode.
The VTSS indicator LED uses a Light Emitting
Diode (LED) on the instrument cluster electronic cir-
cuit board. It is not serviceable separate from the
instrument cluster assembly. If the VTSS indicator
LED comes on and stays on after the bulb test func-
tion, diagnosis of the SKIS should be performed with
a DRB lll
t
scan tool and the proper Powertrain Diag-
nostic Procedures manual.
SIREN - EXPORT
DESCRIPTION
Some vehicles equipped with the premium vehicle
theft security system (VTSS) utilize a separate siren
(Fig. 8). This siren is dedicated to the Vehicle Theft
Security System (VTSS) and is controlled by the
ARKEM module (Remote Keyless Entry). The siren
can reach sound decibels as high as 110 dB. A inter-
nal battery-backup power source and auto detect fea-
ture are also built into the siren. The internal
battery-backup provides sufficient power to sound the
alarm even if the vehicle’s electrical system is
depleted. The auto detect feature has the ability to
sound the siren if any of the wires (voltage supply,
ground and signal) leading to the siren are cut while
the system is armed.
OPERATION
In the event the vehicle theft security is triggered,
the ARKEM module will sound the siren. Refer to
ARKEM module description and operation in the
Power Door Locks section of the service manual for
detailed information.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the left front wheel well splash shield
(Refer to 23 - BODY/EXTERIOR/FRONT END
SPLASH SHIELDS - REMOVAL).
(3) Remove the air blocker to see siren (Fig. 9).
(4) Disconnect the siren electrical connector.
(5) Remove the siren retaining screws and remove
the siren from the vehicle.
Fig. 8 VEHICLE THEFT SECURITY SIREN
PT
VEHICLE THEFT SECURITY 8Q - 7
LIFTGATE CYLINDER LOCK SWITCH (Continued)