2006 ford fiesta 2 door, why the siren does not go off or on when arming or disarming the alarm.

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Try it out brother

Open or remove side panels in boot ,probably corroded contacts.

I am not real familiar with Hybrids. In general, to go to a default setting you would disconnect the regular battery for at least 10 seconds and the systems should reboot. It does not cost to try this.

The alarm is armed if keyfob is used. So you must use the fob to disarm alarm first. So someone can not unlock and open door without keyfob or alarm will be set off.

Most of the time you can lock and unlock the drivers door with the key to disarm the system.

Is there power to the siren? Are the lights flashing? Can you choose to have the siren on or off? If the lights flash and there is no power to the siren it may be the controller. If you have power to the siren then make sure you have good ground at the siren even if you have to run a ground wire from it

If you need further help, I’m available over the phone at https://www.6ya.com/expert/edward_020b3320326d263d

If it is a Ford Factory Alarm it should have key FOBS (remotes). Just press the unlock button 2 times and that should stop it. Alarm systems no matter what brand always have remotes. If you have remotes pressing the unlock should disarm the system 99 times out of 100. If that doesn't work then either the battery in the remote is dead, or the remote is broken. Hope this helps. Cobra :-)

The ignition lock anti-theft switch (19A438) detects if the ignition key cylinder is broken or "slam pulled" during a theft. The ignition lock anti-theft switch is always monitored by the remote anti-theft personality (RAP) module. This allows the alarm system to be triggered in the case that the ignition lock anti-theft switch detects tampering of the ignition key cylinder (even in the event that the alarm is not active at the time).
Refer to the Section 501-14B for more details on the keyless entry remote transmitter (15K601).
The door open warning lamp switch (14018) communicates to the RAP module through the generic electronic module (GEM). This input to the RAP will cause the anti-theft alarm to be sounded if the anti-theft alarm was armed.
The door disarm switches are assembled into both LH and RH lock sets. The door disarm switch must be triggered before the mechanical lock unlocks. This is to prevent the anti-theft alarm from activating when it should have been disarmed.
The RAP module controls the anti-theft system and is the brains of the keyless entry system. The RAP module communicates with the GEM to request that the interior lights be turned ON/OFF with use of the keyless entry remote transmitter, and the GEM communicates to the RAP to inform when the door is opened. Refer to Section 418-00 for inter-module communication.
The RAP module has three wire connectors attached to it:

• The antenna for the keyless entry remote transmitter.
• 26 circuit connector (C256).
• 22 circuit connector (C257).

In addition to the perimeter alarm that uses the door open warning lamp switch, the RAP module also uses the ignition lock anti-theft switch and the autolock/relock feature to prevent theft of the vehicle. For a full description of the autolock/relock system, refer to Section 501-14B .
The THEFT LED is found on the instrument panel between the tachometer scale and the needle pivot point. The LED is illuminated during prearming and flashes when armed or triggered.
Prearming and Arming the System
The system can be armed if:

• The ignition is OFF.
• The PANIC alarm is OFF.
• All doors are closed.

There are two ways to prearm the system:

• Press the LOCK button on the transmitter.
• Open a door, press the power door lock button and close the door.

After 30 seconds the system will be armed and the theft indicator in the cluster will flash every two seconds.
Disarming an Untriggered System
An armed system will be disarmed with one of these valid actions:

1. Pressing the UNLOCK button on the transmitter.

1. Placing a key in the door and turning to UNLOCK.

1. Turning the key to RUN or ACC.

The anti-theft alarm can be triggered by the following conditions:

• The ignition cylinder is damaged with or without the RAP being armed.
• A door is opened without disarming the armed RAP module.

The remote transmitter can activate a panic alarm which is similar to an anti-theft alarm, but does not deactivate the starter or cause the theft indicator to flash.
Disarming a Triggered System
If the system has been triggered, (the horn honks, the lights flash, and an external starter interrupt relay is engaged), the system can be disarmed by:

1. Pressing the UNLOCK or PANIC button on the transmitter.

1. Putting a key in the door and unlocking the door.

1. Turning the ignition to RUN/ACC (Turning the key to RUN/ACC will not disarm an alarm that has been triggered by the ignition lock anti-theft switch.).

THIS IS FROM YOUR OWNERS MANUAL:
Disarming the System
An armed or activated system can be disarmed if you:
n Unlock the doors by entering the unlock code on the keyless
entry keypad.
n Unlock any door or the liftgate with a key.
n Turn ignition to the ON or ACC position.

it seems that the contact circuit in the driverside door is the problem, it's obviously not the alarm itself others wise the same thing would occure on the passengerside. you have to remove the door panel on the driverside and inspect the wires in that circuit for corrosion which would cause no current to pass between the by pass switch the arms or disarms the alarm. please rate this