Disarm factory alarm 500 sl - 1991 Mercedes-Benz Mercedes Benz 500 Class

Is it a factory security alarm or aftermarket? Are you disarming the alarm using the fob? What happens when you try to start the Jimmy after disarming the alarm - do you get only a flashing "Security" or "Theft" light, or do you just hear a loud click noise?

not sure if your having problems with factory alarm but if it is malfunctioning it most likley will again so here it goes...... to reset alarm insert key in drivers door turn key left then turn key right this should disarm and reset the factory alarm. to disable the factory alarm for good in the drivers door wireing harness look for the factory alarm disarm wire it should be dark green/purple with a negative polarity when your sure you have this wire splice a wire of the same size into it and ground the other end to the frame make sure that you have a good solid ground here and thah where you spliced into the wire is a good connection. this should terminate the factory alarm function hope this helps you

Few related help,links.To take care of this issue.
Click the link below:--
Alarm will not disengage? http://technoanswers.blogspot.com/2012/01/ford-pickup-alarm-will-not-disengage.html

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Factory Alarm will go off? http://repairhelpcenter.blogspot.com/2012/01/toyota-avalon-factory-alarm-will-go-off.html

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Security System Reset? http://technoanswers.blogspot.in/2012/04/2007-toyota-avalon-security-system.html

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Thanks.

I would take it back to the place where the alarm was installed or a dealer that installs that brand of alarm for proper diagnosis.

Try turning the key in the rear tailgate key cylinder, to disarm the factory alarm.

Here is what I do on my 95 Cirrus I also do not have a keyless remote (well I do but is broke) and after frustation after frustation trying to disarm the factory alarm I find out that by unlocking the passenger front door with the ignition key from the outside will disarm it you may have to try few times before it's disarmed you need to make sure that the blinking red light stops blinking and all of the locks on all 4 door are up or unlocked, this is what I been doing for 3 years now and that's how I disarm the alarm on my car, I hope this helps.

if it is a factory alarm system fitted, pulling a fuse will do nothing(the thieves would have it away in no time....)and as there are so many aftermarket alarms available any good system would not be so easy to disarm,try something else.(how do we know you are the owner.......)

dealer only ,its built into the ECU have you pushed the fuel cut off switch back down to reset it ?? under the bonnet with a red rubber top on it about an inch square

The Simple Act of Locking the Driver side Door WITH KEY Arm the Factory Alarm. And UNLOCKING Same Door with KEY Disarms it The FOB < Rmote for Alarm Just Honks Horn and Flashes Lights, But it Does the SAME ARMIND & DISARMING. I Hope this Helps You out !!

Have the door panel removed. On the back of the lock cylinder(should be but it maybe loose)harness. manipulate the harness to disarm the factory alarm. Car should start. [email protected]