This is the sequence of operation from the service manual. I will see if I can post the wiring diagram. Hope this helps
3.16 VEHICLE THEFT SECURITY SYSTEM
The Vehicle Theft Security System (VTSS) is part
of the Body Control Module (BCM). The BCM
monitors the vehicle doors, decklid, hood, and the
ignition for unauthorized operation. The alarm activates
by sounding the horn, flashing the fog/park
lamps and the VTSS indicator lamp. The VTSS also
prevents engine operation by sending a PCI bus
message to the PCM. The VTSS indicator lamp will
flash for approximately 15 seconds during the arming
process. If the lamp is on steady, this indicates
that the decklid/hood is open or there is a fault in
the door entry/locks, or ignition switch. If there is
no interruption during the arming process, upon
completion the VTSS indicator lamp will flash at a
slower rate. When then BCM receives an input to
trigger the alarm, the BCM will control the outputs
of the fog lamps, horn, and VTSS lamp for approximately
3 minutes. If the input that triggers the
alarm is still active, then a lights only (park & Fog
lamps) will continue to flash for 15 minutes or until
the input becomes inactive.
Arming (Active and Passive)
Active arming occurs when the RKE transmitter
are used to lock the vehicle doors, whether the doors
are open or closed. The arming process is complete
only after all doors are closed.
Passive arming occurs when the ignition key is
removed, the driver door is opened, and the doors
are locked with the power door lock switch, and the
door is closed.
Disarming (Active and Passive)
Active disarming occurs when the RKE transmitter
is used to unlock the vehicle doors. This disarming
will also halt the alarm once it has been activated.
Access to the decklid is allowed for 30
seconds with the vehicle armed by using the RKE
decklid release button. If the decklid is open during
the arming process, it will be secure after it closes.
Passive disarming occurs upon normal vehicle
entry (unlocking driver door with the key). This
disarming will also halt the alarm once it has been
activated.
Tamper Alert
Normally the VTA lamp will pulse once every 6
seconds when armed. If there is a tamper condition,
the VTA lamp will quickly pulse twice every 6
seconds. When the system is disarmed, a VTSS
tamper alert will sound the horn three times to
indicate a tamper condition has occurred.
Manual Override
The system will not arm if the doors are closed
and the locks are actuated from inside the vehicle.
Diagnosis
For complaints about the Vehicle Theft Alarm
triggering on its own, use the DRBIIIt and read the
“Last VTSS Cause” status.
3.17 USING THE DRBIIIT
Refer to the DRBIIIt user guide for instructions
and assistance with reading trouble codes, erasing
trouble codes, and other DRBIIIt functions.
3.18 DRBIIIT ERROR MESSAGES
Under normal operation, the DRBIIIt will display
one of only two error messages: user-requested
WARM Boot or User-Requested COLD Boot. If the
DRBIIIt should display any other error message,
record the entire display and call the STAR Center.
This is a sample of such an error message display:
ver:2.14
date: 26 Jul93
file: key_iff.cc
date: Jul26 1993
line: 548
err: 0xi
User-Requested COLD Boot
Press MORE to switch between this display
and the application screen.
Press F4 when done noting information.
3.19 DRBIIIT DOES NOT POWER UP
(BLANK SCREEN)
If the LED’s do not light or no sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
connector cavity 16). A minimum of 11 volts is
required to adequately power the DRBIIIt. Check
for proper grounds at DLC cavities 4 and 5.
If all connections are proper between the
DRBIIIt and the vehicle or other
