Antitheft and Alarm Systems: Description and Operation

Operation Flow:

1. Operation Flow
2. Setting the theft warning system
Initial condition
1. Close all doors.
2. Close hood and trunk lid.
3. Pull key out of ignition.

Disarmed phase
The theft warning system is in the disarmed phase when any door(s), hood or trunk lid is open and the F ignition key is not in the ACC or ON position. The security indicator lamp blinks every 0.5 second. When the ignition key is turned to the ACC or ON position, the security indicator lamp turns OFF.

Pre-armed phase and armed phase
The theft warning system turns into the "pre-armed" phase when hood, trunk lid and all doors are closed and locked by key, door lock/unlock switch or front door lock knobs. (The security indicator lamp illuminates.)
After about 30 seconds, the system automatically shifts into the "armed" phase (the system is set). (The security indicator lamp turns OFF.)

3. Canceling the set theft warning system
When the following (a) operation is performed, the armed phase is cancelled.
a. Unlock the doors or the trunk lid with the key.

4. Activating the alarm operation of the theft warning system
Make sure the system is in the armed phase.
When any of the following operations (a), (b), and (c) is performed, the system sounds the horns and flashes the headlamps for about 2.5 minutes. (At the same time, the system disconnects the starting system circuit.)
The starting system is kept dead even after the alarm turns off.
a. Engine hood is opened without using the hood opener.
b. Door is unlocked or trunk lid is opened without using key.
c. Key cylinder is pulled out from either front door or the trunk lid.

Power is supplied at all times:
^ through 30 A fusible link (letter (b) ,located in the fusible link and fuse box)
^ to ignition switch terminal (1).
With the ignition switch in the START position, power is supplied:
^ from terminal (5) of the ignition switch
^ to clutch interlock relay terminal (3) (M/T models) or
^ to theft warning relay-1 terminal (3) (A/T models).
With the ignition switch in the START position, power is supplied:
^ from terminal (6) of the ignition switch (M/T models)
^ through 10 A fuse (No. (16) located in the fuse block)
^ to theft warning relay-1 terminal (3).
With the ignition switch in the ON or START position, power is supplied:
^ through 10 A fuse (No. (26) located in the fuse block)
^ to theft warning relay-1 terminal (1).
Power is supplied at all times:
^ through 10 A fuse (No. (20) located in the fuse block)
^ to theft warning control unit terminal (1) and
^ to combination meter terminal (32).
Power is supplied at all times:
^ through 10 A fuse (No. (17) located in the fuse block)
^ to trunk room lamp switch terminal (1).
With the ignition switch in the ACC or ON position, power is supplied:
^ through 10 A fuse (No. (12) located in the fuse block)
^ to theft warning control unit terminal (3).
Ground is supplied:
^ to theft warning control unit terminal (16)
^ through body grounds (M51) , (M76) and (M77).

THEFT WARNING SYSTEM ACTIVATION (Without key used to lock front doors)
The operation of the theft warning system is controlled by the doors, hood and trunk lid.
To activate the theft warning system, the key must be removed from the ignition switch and the theft warning control unit must receive signals indicating the doors, hood and trunk are closed and the doors are locked.
When a door is open, theft warning control unit terminal (5) receives a ground signal from each door switch.
When a door is unlocked, theft warning control unit terminal (9) receives a ground signal:
^ from terminal (2) of the door unlock sensor
^ through body grounds (M51) , (M76) and (M77) for the front doors and
^ through body grounds (B6) and (B14) for the rear doors.
When the hood is open, theft warning control unit terminal (15) receives a ground signal
^ from terminal (1) of the hood switch
^ through body grounds (E12) and (E37).
When the trunk lid is open, theft warning control unit terminal (14) receives a ground signal
^ from terminal (1) of the trunk room lamp switch
^ through body grounds (T7) and (T14).
If none of the described conditions exist, the theft warning system will activate automatically.

THEFT WARNING SYSTEM ACTIVATION (With key used to lock doors)
If the rear doors are locked and the key is used to lock either front door, theft warning control unit terminal (7) receives a ground signal:
^ from terminal (1) of the front LH or RH key cylinder switch
^ through body grounds (M51), (M76) and (M77).
If this signal is received by the theft warning control unit, the theft warning system will activate automatically.
Once the theft warning system has been activated, theft warning control unit terminal (2) supplies ground to combination meter terminal (39) for the security lamp.
The security lamp will illuminate for approximately 30 seconds and then goes out.
Now the theft warning system is in armed phase.

THEFT WARNING SYSTEM OPERATION
The theft warning system is triggered by:
^ opening a door or the trunk lid without using the key
^ opening the hood
^ tampering with the key cylinder in the door or trunk lid.
Once the theft warning system has been activated, if the theft warning control unit receives a ground signal at terminal (5), terminal (14) or terminal (15) (as described under THEFT WARNING SYSTEM ACTIVATION), the theft warning system will be triggered. Also, when one of the following signals is received at the theft warning control unit, the system will be triggered. The headlamps flash and the horns sound intermittently, and the starting system is interrupted.
When a door key cylinder switch has been tampered with, theft warning control unit terminal (6) receives a ground signal:
^ from terminal (3) of the front LH or RH key cylinder switch
^ through body grounds (M51), (M76) and (M77).
When the trunk key cylinder switch has been tampered with, theft warning control unit terminal (6) receives a ground signal:
^ from terminal (2) of the trunk key cylinder switch
^ through body grounds (T7) and (T14).
If the theft warning system is triggered, ground is supplied:
^ from terminal (4) of the theft warning control unit
^ to theft warning relay-1 terminal (2).
With power and ground supplied, power to the clutch interlock relay (M/T models) or inhibitor switch (A/T models) is interrupted. The starter motor will not crank and the engine will not start.
Power is supplied at all times:
^ through 10 A fuse (No. (35) , located in fusible link and fuse box)
^ to theft warning relay-2 terminals (1), (3) and (6), and
^ to theft warning relay-3 terminal (1).
Power is supplied at all times:
^ through 15 A fuse (No (37) located in fusible link and fuse box)
^ to theft warning relay-3 terminal (6).
Power is supplied at all times:
^ through 15 A fuse (No. (36) located in the fusible link and fuse box)
^ to theft warning relay-3 terminal (3).
When the theft warning system is triggered, ground is supplied intermittently:
^ from terminal (12) of the theft warning control unit
^ to theft warning relay-2 terminal (2) and
^ to theft warning relay-3 terminal (2).
The headlamps flash and the horns sound intermittently.
The alarm automatically turns off after 2 or 3 minutes but will reactivate if the vehicle is tampered with again.

THEFT WARNING SYSTEM DEACTIVATION
To deactivate the theft warning system, a door or the trunk lid must be unlocked with the key.
When the key is used to unlock a door, theft warning control unit terminal (11) receives a ground signal from terminal (2) of the front LH or RH key cylinder switch.
When the key is used to unlock the trunk lid, theft warning control unit terminal (10) receives a ground signal from terminal (1) of the trunk key cylinder switch.
When the theft warning control unit receives either one of these signals, the theft warning system is deactivated (Disarmed phase).