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If it is an aftermarket alarm system it is tied into your starter circuit coming off of your ignition switch. You need to remove plastic covers under steering wheel on toyota vehicles it is phillips head screws and some 10mm bolts. Find alarm system this is tricky but possible find the wire that is tapped into a thick wire leading up to steering column to the key ignition switch it should be a thicker wire sometimes red in color that wire is the starter interupt for the alarm system remove that wire (cut it) at alarm side and starter function should be restored.
IF IT IS AN AFTERMARKET SYSTEM hope this helps
I do not know how mechanically/electrically inclined you are. Take my advice "with a grain of salt."
Just stick your head under the dashboard and unplug the aftermarket alarm, if it has one it should be obviously stuffed in there. After that you just need to find the "starter cut relay." Usually it is taped, or "zip tied", up under the dash connected to the ignition switch harness. Once you find that, connect the 2 "big" wires together. On a standard "Bosch Style Relay" they will be terminal 87 and 30. The bottom of the aftermarket relay should be marked. From the wiring diagram, the starter signal wire is light blue with a yellow stripe at the ignition switch harness, all the way to the transmission, and black with a yellow stripe at the starter
The car should start fine when you are finished. without lights and horns going off randomly.
If the alarm isn\'t hooked to the ignition (The vehicle will still start when the alarm is going off). Just look under the dash for a black box usually about the size of a deck of cards. Unplug the harness and you will have deactivated the alarm. If there is a starter interrupt you\'ll need to dig deeper. Near the ignition switch harness there would be a Green/Red wire (Ignition) and a red wire (Starter). There is often a T-Tap connection to the ignition wire while the starter wire would be cut and routed to the alarm brain (Black box). Simply unplug the t-tap connection from the ignition wire and restore the connection to the starter using a connector.
Most stereo shops would be able to resolve the issue. Our store charges only $35 for a basic alarm removal.
Is it an aftermarket unit or a factory alarm? An aftermarket unit has an external siren under the hood. Drop the lower part of the dash on driver side and visually inspect for non-factory wiring. There is almost always an impact sensor attached with cable ties that reacts to small impacts on the harness. There are LEDs on the sensor that will help you identify it. Trace the wiring harness of the sensor until you find the control module of the alarm. Simply unplugging the main harness of the control module will bypass it. You must be very careful when doing this because some alarms have a closed circuit to your starter wire going through the alarm and unplugging it will open the circuit to your starter and your car won't start until you connect your starter wire back together.
Aftermarket alarm failure it the transponder or transducer adjust the sensitivy and it will still give problem your solution is remove the alarm or diable the alarm go under the dash there you will fing the ignition harness where the aftermarket alarm installer has cut and spliced into the ignition to install a relay you will cut it and restore the original condition it simple follow the color of the wire they cut and restore it back if you use a but connection make sure it wont seperate and get you stranded you are better off soldering the connection back and wrap it with electrical tape to protect it from shorting out.
If the headlights are flashing, the alarm system is factory installed. Inserting the key into the driver door lock and turning to the left then back to the right is supposed to disarm it. If the parking lights are blinking,, the alarm is an aftermarket add on, and there should be a disarm button underthe dash on the driver side. If it' an aftermarket alarm, you should be able to have it removed. There is a way to bypass the factory alarm. There is a wiring harness in the driver's door. You will have to remove the door panel to find it. The wire is dark green and purple. Splice into that wire and ground it to the chassis and the alarm should no longer work.
This depends on if its a factory alarm or not,if its factory then try using the key to unlock the door if it doesnt work on the driverside then unlock the passenger side door this is due to a bad door lock switch on the driver door, if its aftermarket you nned to look under the dash and find the wire for the starter coming down the steering column, you will see a yellow wire i belive the wire will be cut in half and connected to two diffrent wires, cut it and connect it back together and it will start you will then need to look further for fuses on alarm wires and remove the fuses as the alarm module is bad, a good way to tell its a factory alarm is the trucks horn is the siren, if this is the case then its probably factory and door switch is bad in the lock so try pass/side lock.hope this is helpful.
Now im not sure since the manual says your model has the same alarm system as the 328i and on the 328i you can remove the module to disable by doing the following. you can unplug the control module. It is located under the glove box. Climb under the dash on the passenger side and remove a few screws on the trim panel under the glove box. Theres a black control module with a green connector. There should be a lock tab on the connector. press the lock tab and pull out the connector. The alarm should now be disabled. But if it has the special transponder key this may not work.
But if the only reason you want to disable it is because of the motion sensor setting of the alarm for no reason there is a solution for this. To disable the motion sensor, hit the lock button to arm, then hit lock button again within four seconds to disable motion sensor. Red light on rearview mirror should flash four times, then pause, then start flashing on regular intervals. this is most likely the reason if your having the issue where the alarm goes off every 20 minutes. If you want to completely remove it below is a wiring diagram taken from the manual for you alarm system. this is from the manual its the alarm wiring diagram.
Battery Constant 12v Positive Wire ( ): Red/White or RedBattery Constant 12v Positive Wire Location: Ignition Switch Harness Starter Positive Wire ( ): Black/Yellow or Black Starter Positive Wire Location: Ignition Switch Harness Ignition Positive Wire ( ): Green Ignition Positive Wire Location: Ignition Switch Harness Second Ignition Positive Wire ( ): Purple/White or Purple Second Ignition Positive Wire Location: Ignition Switch Harness Parking Light Positive Wire ( ): Gray/Purple and Gray/Yellow. Use Both Wires. This vehicle has a dual parking light system that will require 2 extra relays. Parking Light Positive Wire Location: At Headlight Switch Power Door Lock Positive Wire ( ): White/Red Power Door Lock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Power Door Unlock Positive Wire ( ): Blue/Red Power Door Unlock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Door Trigger Negative Wire (-): Brown/Gray Door Trigger Negative Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Domelight Supervision Wire: Turns On With Unlock Domelight Supervision Wire Location: N/A Horn Negative Wire (-): Brown/Red or Brown/Yellow Horn Negative Wire Location: At Steering Column Harness Tachometer Wire Negative Wire (-): Black Tachometer Wire Negative Wire Location: At Instrument Cluster Brake Light Positive Wire ( ): Blue/Red or Green/Red Brake Light Positive Wire Location: At Switch Above Brake Pedal Factory Alarm Disarm Wire (-): Disarms With Factory Remote Only. Factory Alarm Disarm Wire Location: N/A Factory Anti-Theft System: Transponder Anti-Theft System, Requires Bypass And Extra Ignition Key. The 1997 model year vehicle may require a bypass module and an extra ignition key, if vehicle is equipped with a special key from BMW. Factory Anti-Theft System Location: Transponder At Ignition Switch Tumbler if you require further assistance please let me know and i will help assist you from there. Thanks, Midwest-Tek
Easiest and most painless way is to get and adapter harness from any Wal-mart or auto supply store. Has easy to follow diagrams and tells where all wires go. Also makes for easy, no cut, removal in future.