to Step 4. If not OK, repair the open circuit to the
fuse in the junction block as required.
(4) Turn the ignition switch to the ON position.
Check for battery voltage at the fused ignition switch
output (run/start) circuit cavity of the SKIM wire
harness connector. If OK, use a DRB IIIt scan tool
and the proper Body Diagnostic Procedures Manual
to complete the diagnosis of the SKIS. If not OK,
repair the open circuit to the fuse in the junction
block as required.
VEHICLE THEFT SECURITY SYSTEM
SELF-TESTS
A diagnostics test mode is available in the system
to verify operation of all monitored switches or cir-
cuits. To enter diagnostics, use the DRB IIIt and the
proper Body Diagnostic Procedures Manual.
When the diagnostics test mode is activated, the
horn will pulse twice to indicate that the trunk key
cylinder is in its proper position. Placing the key in
the ignition will allow the warning lamp, headlamps
and park/tail lamps to be checked for proper flashing
operation. Remove the ignition key from the ignition
switch in order to check for door lock cylinder switch
operation. At the completion of each of the following
operations, a horn pulse will occur to indicate proper
operation. Each action must be separated by a mini-
mum of one second or horn pulse will not occur.
• Open then close each door one at a time.
• Rotate the key in each of the door lock cylinder
to the unlock position.
• Cycle the ignition switch key to the ON position
as the last step. A single horn pulse will indicate
proper operation of the ignition switch. This will also
take the system out of the stand alone diagnostic
mode.
The self diagnostic mode may also be exited by
using the scan tool.
When the RKE lock button is pressed, the BCM
will also pulse the horn. This is part of the RKE nor-
mal operation.
SERVICE PROCEDURES
SENTRY KEY IMMOBILIZER TRANSPONDER
PROGRAMMING
Two programmed Sentry Key transponders are
included with the Sentry Key Immobilizer System
(SKIS) when it is shipped from the factory. The Sen-
try Key Immobilizer Module (SKIM) can be pro-
grammed to recognize up to six additional
transponders, for a total of eight Sentry Keys. The
following “Customer Learn” programming procedure
for the programming of additional transponders
requires access to at least two of the valid Sentry
Keys. If two valid Sentry Keys are not available, Sen-
try Key programming will require the use of a DRB
IIIt scan tool and the proper Body Diagnostic Proce-
dures Manual.
CUSTOMER LEARN
(1) Obtain the additional Sentry Key transponder
blank(s) that are to be programmed for the vehicle.
Cut the additional Sentry Key transponder blanks to
match the ignition lock cylinder mechanical key
codes.
(2) Insert one of the two valid Sentry Key tran-
sponders into the ignition switch and turn the igni-
tion switch to the ON position.
(3) After the ignition switch has been in the ON
position for about three seconds, but no more than
fifteen seconds, cycle the ignition switch back to the
OFF position. Replace the first valid Sentry Key in
the ignition lock cylinder with the second valid Sen-
try Key and turn the ignition switch back to the ON
position. Both operations must be performed within
15 seconds.
(4) About ten seconds after the completion of Step
3, the VTSS indicator LED will start to flash and a
single audible chime tone will sound to indicate that
the system has entered the “Customer Learn” pro-
gramming mode.
(5) Within about fifty seconds of entering the “Cus-
tomer Learn” programming mode, turn the ignition
switch to the OFF position, replace the valid Sentry
Key with a blank Sentry Key transponder, and turn
the ignition switch back to the ON position.
(6) About ten seconds after the completion of Step
5, a single audible chime tone will sound and the
VTSS indicator LED will stop flashing and stay on
solid for about three seconds to indicate that the
blank Sentry Key transponder has been successfully
programmed. The SKIS will immediately return to
normal system operation following exit from the
“Customer Learn” programming mode.
(7) Go back to Step 2 and repeat this process for
each additional Sentry Key transponder blank to be
programmed.
If any of the above steps is not completed in the
proper sequence, or within the allotted time, the
SKIS will automatically exit the “Customer Learn”
programming mode. The SKIS will also automatically
exit the “Customer Learn” programming mode if it
sees a non-blank Sentry Key transponder when it
should see a blank, if it has already programmed
eight valid Sentry Keys, or if the ignition switch is
turned to the OFF position for more than about fifty
seconds.
LH VEHICLE THEFT/SECURITY SYSTEMS 8Q - 5
DIAGNOSIS AND TESTING (Continued)
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