Is there a code such as turn key on off 3 or 4 times to reset alarm. The factory alarm goes off about 20 minutes after setting it for no reason I even replaced the battery and still does it , Then put it on a scanner and NO codes come up , What to do ? Tony in MN Thank you if you can help me .
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Re: 97 bmw 528i factory alarm goes off for no reason
Disable the hood microswitch. just unplug it. That and the cabin sensor are the most probably reasons the alarm will go off.
Alarms are useless. Totally effin useless. So it goes off.....then whaddya going to do. Shoot someone? Call the police? or listen to it drain the battery over and over again.
But....you can't disable the alarm totally. The bmw engineers have tied it into the main computer. you can however disable the sensors one by one so it doesn't set off the alarm. Hood sensor....Hood sensor....that's the culprit.
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One problem can be when changing batteries be careful not to push any buttons, this can cause problems or if the batteries have been dead for a while, looses its "frequency" the alarm in the car is not picking up the transmitter in the key.(key and alarm in car out of sync ) get the keys re-coded. depending on which bmw you have you can DIY ( google re-coding bmw 5.. keys) or go to bmw.
There is a short in the transponder,or tranducer itself, are you near a garage door opener,like when someone opens there door and it signal you alarm, Its either picing up a alarm signal else where or its sensitivity is to sensitive itself. depends on the alarm itself there are resistor adjustment for yours, its on the reciever. you may want to adjust the sensitivity so if a feather falls on it it dont go off
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