Question
-------------------------------------------
The text above is a follow-up to ...
-----Question-----
I e-mail you earlier with a problem with the car sputtering. Now that I have fixed that problem, I have another one. The car's alarm system is not working properly. When I lock the car and upon reentering the car sometimes the alarm will go off for no reason. I have double checked the vehicle when locking the doors to make sure that they are all locked. This only occurs if you allow the car to sit locked for a length of time. Do you have any suggestions about way the alarm is malfunctioning.
Thanks Al.
2000 Nissan Maxima SE
AnswerHi Al,
Here is some stuff on this. This is basic operation of the system. It might give you a direction to look in. Do you have the key fob? The disarming is caused by the alarm system getting a ground signal from the lock mechanism or the key fob sending a signal to the controller. There is a possibility that the switch is worn and not sending the ground signal. Try unlocking the truck first then the door and this would be a way to check it.
1. Operation Flow
2. Setting The Theft Warning System
Initial condition
Ignition switch is in OFF position.
Disarmed phase
When the theft warning system is in the disarmed phase, the security indicator lamp blinks every 2.6 seconds.
Pre-armed phase and armed phase
When the following operation 1 or 2 is performed, the theft warning system turns into the "pre-armed" phase.
(The security indicator lamp illuminates.)
Smart entrance control unit receives LOCK signal from key cylinder switch or multi-remote controller after hood, trunk lid and all doors are closed.
Hood, trunk lid and all doors are closed after front doors are locked by key, lock/unlock switch or multi-remote controller. After about 30 seconds , the system automatically shifts into the "armed" phase (the system is set). (The security indicator lamp blinks every 2.6 seconds. )
3. Canceling The Set Theft Warning System
When the following 1 or 2 operation is performed, the armed phase is canceled.
Unlock the doors with the key or multi-remote controller.
Open the trunk lid with the key or multi-remote controller.
4. Activating The Alarm Operation of The Theft Warning System
Make sure the system is in the armed phase. (The security indicator lamp blinks every 2.6 seconds. )
When the following operation 1 or 2 is performed, the system sounds the horns and flashes the headlamps for about 50 seconds.
Engine hood, trunk lid or any door is opened during armed phase.
Disconnecting and connecting the battery connector before canceling armed phase.
POWER SUPPLY AND GROUND
Power is supplied at all times
through 10 A fuse [No.12, located in the fuse block (J/B)]
to security indicator lamp terminal 4.
Power is supplied at all times
through 10 A fuse [No.13, located in the fuse block (J/B)]
to smart entrance control unit terminal 10.
With the ignition switch in the ON or START position, power is supplied
through 10 A fuse [No.10, located in the fuse block (J/B)]
to smart entrance control unit terminal 33.
With the ignition switch in the ACC or ON position, power is supplied
through 10 A fuse [No.1, located in the fuse block (J/B)]
to smart entrance control unit terminal 21.
Ground is supplied
to smart entrance control unit terminal 16
through body grounds M9, M25 and M87.
INITIAL CONDITION TO ACTIVATE THE SYSTEM
The operation of the theft warning system is controlled by the doors, hood and trunk lid.
Pattern A
To activate the theft warning system, the smart entrance control unit must receive signals indicating the doors, hood and trunk lid are closed.
When a door is open, smart entrance control unit terminal 28, 29 or 40 receives a ground signal from each door switch.
When the hood is open, smart entrance control unit terminal 27 receives a ground signal
from terminal 1 of the hood switch
through body grounds E11, E22 and E53.
When the trunk lid is open, smart entrance control unit terminal 38 receives a ground signal
from terminal 1 of the trunk room lamp switch
through body grounds T6 and T8.
When smart entrance control unit receives LOCK signal from key cylinder switch or multi-remote controller and none of the described conditions exist, the theft warning system will automatically shift to armed mode.
Pattern B
To activate the theft warning system, the smart entrance control unit must receive signal indicating any door
(including hood and trunk lid) is opened.
When the front doors are locked with key, lock/unlock switch or multi-remote controller and then all doors are closed, the theft warning system will automatically shift to armed mode.
THEFT WARNING SYSTEM ACTIVATION
Pattern A
With all doors (including hood and trunk lid) close if the key is used to lock doors, terminal 41 receives a ground signal
from terminal 3 of the key cylinder switch LH
through body grounds M9, M25 and M87.
If this signal, or lock signal from remote controller is received by the smart entrance control unit, the theft warning system will activate automatically.
NOTE: Theft warning system can be set even though all doors are not locked.
Pattern B
With any door (including hood and trunk lid) open if lock/unlock switch is used to lock doors, terminal 23 receives a ground signal
from terminal 18 of lock/unlock switch LH, or
from terminal 2 of lock/unlock switch RH
through body grounds M9, M25 and M87, or
With any door (including hood and trunk lid) open if the key is used to lock doors, terminal 41 receives a ground signal
from terminal 3 of the key cylinder switch LH
through body grounds M9, M25 and M87.
If these signals and lock signal from remote controller are received by the smart entrance control unit and ground signals of terminals 36 and 37 are interrupted, the theft warning system will activate automatically.
NOTE: Theft warning system can be set even though the rear door is not locked.
Once the theft warning system has been activated, smart entrance control unit terminal 31 supplies ground to terminal 5 of the security indicator lamp.
The security lamp will illuminate for approximately 30 seconds and then blinks every 2.6 seconds. Now the theft warning system is in armed phase.
THEFT WARNING SYSTEM ALARM OPERATION
The theft warning system is triggered by
opening a door
opening the hood or the trunk lid
detection of battery disconnect and connect. Once the theft warning system is in armed phase, if the smart entrance control unit receives a ground signal at terminal 28, 29, 40 (door switch), 38 (trunk room lamp switch) or 27 (hood switch), the theft warning system will be triggered. The headlamps flash and the horn sounds intermittently.
Power is supplied at all times
through 15 A fuse (No.68, located in fuse and fusible link box)
to headlamp relay RH terminals 1 and 5,
through 15 A fuse (No.69, located in fuse and fusible link box)
to headlamp relay LH terminals 1 and 5,
through 10 A fuse (No, 61 located in fuse and fusible link box)
to theft warning horn relay-1 terminals 1 and 3, and
to theft warning horn relay-2 terminal 1
through 10 A fuse (No.57, located in fuse and fusible link box)
to horn relay terminal 2.
When the theft warning system is triggered, ground is supplied intermittently
from smart entrance control unit terminal 4
to theft warning horn relay-2 terminal 2.
When theft warning horn relay-2 is energized, ground is supplied intermittently
to theft warning horn relay-1 terminal 2,
to horn relay terminal 1,
to headlamp relay LH terminal 2 and
to headlamp relay RH terminal 2.
through body grounds E11, E22 and E53.
The headlamps flash and the horn sounds intermittently.
The alarm automatically turns off after 50 seconds but will reactivate if the vehicle is tampered with again.
THEFT WARNING SYSTEM DEACTIVATION
To deactivate the theft warning system, a door or trunk lid must be unlocked with the key or remote controller.
When the key is used to unlock the door, smart entrance control unit terminal 30 receives a ground signal
from terminal 1 of the LH key cylinder switch.
When the key is used to open the trunk lid, smart entrance control unit terminal 42 receives a ground signal from terminal 1 of the trunk lid key cylinder switch.
When the smart entrance control unit receives either one of these signals or unlock signal from remote
controller, the theft warning system is deactivated. (Disarmed phase)
PANIC ALARM OPERATION
Multi-remote control system may or may not operate theft warning system (horn and headlamps) as required.
When the multi-remote control system (panic alarm) is triggered, ground is supplied intermittently
from smart entrance control unit terminal 4
to theft warning lamp relay terminal 2 and
to theft warning horn relay terminal 2.
The headlamp flashes and the horn sounds intermittently.
The alarm automatically turns off after 25 seconds or when smart entrance control unit receives any signal from multi-remote controller.
