Alarm going off due to poor unlocking speed - PeachParts Mercedes-Benz Forum

crhenkel · #1 10-22-2007, 11:12 PM

I replaced the alarm brain module in my 190E 16v and it fixed the faulty factory alarm system i had. It all works as it should now. Only one problem...
When I unlock the car's trunk the door locks seem to take anywhere from 2-5 seconds longer to power up and unlock themselves with the vacuum system. In this time period, I typically have opened the truck to place or remove what ever item I was intent on dealing with. Opening the truck of course turns the light on in the truck and this of course sets the alarm horn off since the system sees an entry point opened before the door locks can trip the alarm reset. the trunk is open and the door locks are still down so the alarm goes off. Then in 2-5 seconds the door locks decide to pop up and the alarm reset occurs and the horn shuts off. how nice, I unlock the car as I am supposed to in my own car and the alarm goes off since the door locks decide to be slow in responding. How do I fix the slow response of the door locks so the alarm doesnt go off, or if it does it is reset almost immediately instead of having to tell my passenger, "Oh dont worry the alarm will shut off in a minute or so." There is nothing other than the slow response of the door locks wrong with the system, the alarm is working correctly. I just am not sure if a new pump or what might help the response time of the auto door unlock sytem. Car is 1986 190e 2.3-16v US

Strife · #2 10-22-2007, 11:35 PM

I have this problem also on an 86 560SL. I just wait until I hear everything stop moving. It is a PITA, though.

JFawcett · #3 10-23-2007, 11:00 AM

Just unhook it.
Do you ever rush to the aid of some car that is clearly being stolen by it's owner?
They all eventually loose their minds and the alarms go off at the most inappropriate times. On my 87 560SL the alarm started going off driving down the road. On my 420SEL, the alarm went off only when opening the hood - even with the doors unlocked.
The combination of electronics, vacuum and age just doesn't bode well for the performance of the alarms.

throne7 · #4 10-23-2007, 05:31 PM

Quote:

Originally Posted by JFawcett

Just unhook it.
Do you ever rush to the aid of some car that is clearly being stolen by it's owner?
They all eventually loose their minds and the alarms go off at the most inappropriate times. On my 87 560SL the alarm started going off driving down the road. On my 420SEL, the alarm went off only when opening the hood - even with the doors unlocked.
The combination of electronics, vacuum and age just doesn't bode well for the performance of the alarms.

How do you unhook it?

crhenkel · #5 10-23-2007, 10:14 PM

It is extremely easy to unhook. Just remove the black rectangular plastic electronics box that is for the alarm. Mine is super easy to get at, right next to the cruise amp under the pass floor carpet. Just Unhook its electrical connector from the alarm brain and you are done. I want to keep mine connected, it works perfectly, I just have to wait until the vac powered door locks finish moving so the alarm does not trigger. I want to get the door locks as fast as they used to be so that I dont have to wait. Wondering if a new vac pump is the solution.

Chad300tdt · #6 10-24-2007, 03:18 PM

Do you have a MityVac? You could do some investigation and see if there is a leak somewhere or if the pump is pulling enough vacuum. I'm not positive, but I think you should be getting about 20 in hg from the pump.

crhenkel · #7 10-25-2007, 07:09 PM

I do have and will check it with my Mitevac for the vac it is pulling. Anyone know if the vac pumps for all 190Es are the same specs? Also is the pump from the 300e W124 cars the same? I want to start looking for a used replacement.
Thanks