•
VTSS Indication - During the sixteen second VTSS arming function, the cluster will flash the security indicator
on and off repeatedly at a steady, fast rate to indicate that the VTSS is in the process of arming. Following
successful VTSS arming, the cluster flashes the security indicator on and off continuously at a slower rate to
indicate that the VTSS is armed. The security indicator continues flashing at the slower rate until the VTSS is
disarmed or triggered. If the VTSS has alarmed and rearmed, the cluster will flash the security indicator at a
steady, slow rate for about thirty seconds after the VTSS is disarmed.
•
SKIS Lamp-On Message - Each time the cluster receives a SKIS lamp-on message from the SKREEM, the
security indicator will be illuminated. The indicator can be flashed on and off, or illuminated solid, as dictated
by the SKREEM message. The indicator remains illuminated solid or continues to flash until the cluster
receives a SKIS lamp-off message from the SKREEM, or until the ignition switch is turned to the Off position,
whichever occurs first. For more information on the SKIS and the security indicator control parameters, (Refer
to 8 - ELECTRICAL/VEHICLE THEFT SECURITY/SENTRY KEY IMMOBILIZER SYSTEM - OPERATION).
•
Communication Error - If the cluster receives no SKIS lamp-on or lamp-off messages from the SKREEM for
ten consecutive message cycles, the security indicator is illuminated by the instrument cluster. The indicator
remains controlled and illuminated by the cluster until a valid SKIS lamp-on or lamp-off message is received
from the SKREEM.
•
Actuator Test - Each time the instrument cluster is put through the actuator test, the security indicator will be
turned on, then off again during the bulb check portion of the test to confirm the functionality of the LED and
the cluster control circuitry.
The instrument cluster circuitry controls the security indicator whenever the ignition switch is in the Off position and
the VTSS is arming, armed, or alarming. Whenever the ignition switch is in the On or Start positions, the SKREEM
performs a self-test to decide whether the SKIS is in good operating condition and whether a valid key is present in
the ignition lock cylinder. The SKREEM then sends the proper lamp-on or lamp-off messages to the instrument
cluster. For further diagnosis of the security indicator or the instrument cluster circuitry that controls the indicator,
(Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If the instrument cluster
flashes the security indicator upon ignition On, or turns on the security indicator solid after the bulb test, it indicates
that a SKIS malfunction has occurred or that the SKIS is inoperative.
For proper diagnosis of the VTSS, the SKIS, the SKREEM, the CAN data bus, or the electronic message inputs to
the instrument cluster that control the security indicator, a diagnostic scan tool is required. Refer to the appropriate
diagnostic information.
SERVICE 4WD INDICATOR
DESCRIPTION
A service 4WD indicator is standard equipment on all
instrument
clusters.
However,
on
vehicles
not
equipped with the optional four-wheel drive system
and electronically shifted transfer case, this indicator is
electronically disabled. The service 4WD indicator is
located below the minor gauge set on the left side of the cluster.
The service 4WD indicator consists of a stencil-like cutout of the text “SVC 4WD” in the opaque layer of the instru-
ment cluster overlay. The dark outer layer of the overlay prevents the indicator from being clearly visible when it is
not illuminated. An amber Light Emitting Diode (LED) behind the cutout in the opaque layer of the overlay causes
the “SVC 4WD” text to appear in amber through the translucent outer layer of the overlay when the indicator is
illuminated from behind by the LED, which is soldered onto the instrument cluster electronic circuit board. The ser-
vice 4WD indicator is serviced as a unit with the instrument cluster.
OPERATION
The service 4WD indicator gives an indication to the vehicle operator when the Front Control Module (FCM) (also
known as the Integrated Power Module/IPM) has recorded a Diagnostic Trouble Code (DTC) for an electronic trans-
fer case circuit or component malfunction. This indicator is controlled by a transistor on the instrument cluster circuit
board based upon cluster programming and electronic messages received by the cluster from the FCM over the
Controller Area Network (CAN) data bus.
8J - 70
CLUSTER
ND