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VEHICLE THEFT SECURITY SYSTEM
8Q - 1
VEHICLE THEFT SECURITY SYSTEM
CONTENTS
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page
GENERAL INFORMATION ..................
ON-BOARD DIAGNOSTIC SYSTEM ...........
SECURITY ALARM MODULE RELAY .........
SECURITY SYSTEM DOOR DISARM SWITCH . .
SECURITY SYSTEM HOOD SWITCH
REPLACEMENT ........................
SECURITY SYSTEM LIFTGATE DISARM SWITCH ..
SECURITY SYSTEM MODULE REPLACEMENT .
SECURITY SYSTEM SCHEMATIC ...........
SYSTEM SELF-TESTS .....................
VEHICLE THEFT SECURITY SYSTEM DIAGNOSIS ..
GENERAL INFORMATION
This passive system is designed to protect against
vehicle theft. The Security Alarm Module (SAM) is a
logic controlled device that monitors vehicle doors,
hood, liftgate and ignition action for unauthorized
operation. The alarm activates by sounding the horn,
flashing the headlamps, park and tail lamps and
providing an engine no run feature.
Passive arming occurs upon normal vehicle exit
(ignition OFF, open door, lock with power locks, close
door). The Security lamp in the panel will flash for 15
seconds, showing that arming is in progress. Note
that this 15 second arming period will start after the
Illuminated Entry has timed out (courtesy lamps off).
If no monitored systems are activated during this
period, the system will arm. If the hood switch is not
seen by the system, the Security lamp will remain
steadily lit during the arming process, although the
system will still arm.
The engine compartment will not be protected
from entry while the security lamp remains lit.
Active arming occurs when the Remote Keyless En-
try transmitter is used to lock the vehicle doors,
whether the doors are open or closed. If one or more
doors are open, the arming sequence is completed
only after all doors and liftgate are closed.
Passive disarming occurs upon normal vehicle entry
(unlocking either front door or liftgate, with the key).
This disarming also will halt the alarm once it has
been activated.
Active disarming occurs when the Remote Keyless
Entry transmitter is used to unlock the vehicle doors.
This disarming also will halt the alarm once it has
been activated.
When the battery is connected the Vehicle Theft
Security System enters its power up alarm mode
which:
²
A tamper alert exists to notify the driver that the
alarm had been activated, and has since timed-out
(alarmed for more than 18 minutes). This alert gives
3 horn pulses when the vehicle is disarmed.
The alarm system will not arm if the doors are
manually locked, providing a manual override of
alarm.
flashes the headlamps
SYSTEM SELF-TESTS
A diagnostics mode is available in the system to
verify operation of all monitored switches or circuits.
To enter diagnostics, cycle the ignition key to the
accessory position 3 times, leaving the key in this
position.
Upon entering diagnostics, the headlamps, park
and tail lamps will begin flashing to verify their
operation. In addition, the horn will sound twice.
Returning the ignition to the OFF position will stop
the lamps from flashing while keeping the system in
diagnostics.
While in diagnostics mode, a horn pulse should
occur at each of the following events indicating proper
operation:
Note that vehicles equipped with the Vehicle Theft
Security System are also equipped with Illuminated
Entry. When in diagnostic mode it is recommended
that the Illuminated Entry Relay be removed. Other-
wise it is necessary to wait for the 30 seconds delay
after each door opening or closure.
(1) Beginning with all doors closed, open then close
each door. The horn will sound when the door jamb
switch closes, and then again when the switch opens.
There must be a 1 second delay between closing and
opening the switch.
(2) Open, then close the hood. The horn will sound
when the hood is opened, and again when it is closed.
(3) Activate the power door locks in both the Lock
and Unlock directions. The horn will sound after each
activation.
²
flashes the park and tail lamps
prevents the engine from running.
To exit this mode, the system must be disarmed as
mentioned previously.
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(4) Rotate the key in each door lock cylinder to the
unlock position. The horn will sound as the switch
closes, and again when it opens. There must be a 1
second delay between changing switch states, or the
horn will not sound.
(5) Cycle the key to the ignition RUN position. A
single horn pulse will indicate proper operation of the
ignition input. This also will take the module out of
the diagnostics mode.
(6) Activate the Remote Keyless Entry in both the
Lock and Unlock directions. The horn will sound after
each activation.
For any of these tests, if the switch does not remain
open or closed for at least 1 second, the horn will only
sound once.
The lack of a horn pulse, during any operation,
indicates:
²
or a failure internal to the module.
Check for continuity at the switch. If this is good,
check for an open or shorted wire between the switch
and alarm module. Also, check if the Powertrain Con-
trol Module (PCM) has been replaced recently. For
the first 20 engine starts with a new PCM, the Ve-
hicle Theft Security System will function normally
except it will not prevent the engine from running.
A PCM from a vehicle equipped with Vehicle
Theft Security System cannot be used in a ve-
hicle that is not equipped with Vehicle Theft
Security System.
If the Security Lamp comes on after ignition
ON and stays on, the CCD bus communication
with the PCM has been lost.
a switch failure
ON-BOARD DIAGNOSTIC SYSTEM
The DRB II Scan tool also may be used to test the
Security System. Refer to the appropriate Diagnostic
Procedures Manual.
the lack of that input to the Vehicle Theft Security
System module
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VEHICLE THEFT SECURITY SYSTEM
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VEHICLE THEFT SECURITY SYSTEM DIAGNOSIS
 8Q - 4
VEHICLE THEFT SECURITY SYSTEM
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VEHICLE THEFT SECURITY SYSTEM DIAGNOSIS CONTINUED
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VEHICLE THEFT SECURITY SYSTEM
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VEHICLE THEFT SECURITY SYSTEM DIAGNOSIS CONTINUED
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