Operation - Chrysler 2004 Concorde Service Manual

8Q - 6 VEHICLE THEFT SECURITY
VTSS INDICATOR (Continued)

OPERATION

The SKIM sends messages to the BCM 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
bus messages to the BCM to keep the LED off for a
duration of about one second. Then the SKIM sends
messages to the BCM 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 BCM to flash the VTSS indi-
cator LED.
The SKIM can also send messages to the BCM to
flash the LED and to generate a single audible chime
tone. These functions serve as an indication to the
customer that the SKIS has been placed in its "Cus-
tomer Learn" programming mode. See Sentry Key
Immobilizer System Transponder Programming in
this section for more information on the "Customer
Learn" programming mode.
The VTSS indicator LED is housed in the Auto-
matic Temperature Control (ATC) Sun Sensor located
in the instrument panel top cover. Refer to Group 8E
- Instrument Panel and Systems for service of ATC
Sun Sensor. If the VTSS indicator LED comes on and
stays on after the bulb test function, diagnosis of the
SKIS should be performed with a DRB III scan tool
and the proper Body Diagnostic Procedures Manual.
LH