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  #1  
Old 04-03-2002, 04:46 PM
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Talking W126 keyless entry installation

I just installed a keyless entry system in my 89 420SEL. I used the system shown over on the W126 coupes web site.

http://www.mbcoupes.com/audioalarm/alarm/keylessentry1.htm

Great price & it works as it should. Only one minor difference in my 89 SEL's wiring harness for the pneumatic lock modual compared to the 85 SEC's.....the red/black wire described on the
SEC is red/white on my SEL. No biggie, just thought I'd share.

Thanks Jim Ham for supplying this info for all to see!
Now I don't have to worry about scratching my doors with the keys anymore.
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  #2  
Old 04-03-2002, 05:29 PM
moedip
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did it affect your factory alarm system in anyway? The reason I ask is on my 1988 560sel if you lock the driver's door with the key and try to unlock the passenger door with the key - the alarm goes off. I then have to lock the passenger door and run around and unlock the driver's door with the key to disable the alarm. I was just curious if releasing the locks from the trunk will trigger the alarm or if you lock the doors with the keyless remote will the alarm even be activated? I have heard that there is a mechanical mechanism in the driver's door that is used by the key to arm the alarm. Is your alarm disabled when you lock doors with keyless unit? Thanks. If everything is good, I will definately install one in my car.
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  #3  
Old 04-03-2002, 05:34 PM
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An alternative solution

Neat idea.

For those looking for a more comprehensive solution, consider the Code Alarm available from Crutchfield:

http://www.crutchfield.com/cgi-bin/S-zfzIxvRCv7P/ProdView.asp?s=0&c=2&g=802&I=514REC11&o=m&a=0

I paid about $100 with the necessary relays and diodes (Radio Shack) and have the whole thing wired into the vacuum pump in the trunk of my 1990 560SEL. The advantage is that this installation optionally allows visual confirmation (1 flash of the parking lights=locked, 2=unlocked) and aural confirmation (I used an old horn from my BMW bike mounted outside under the rear deck, and a relay - the Code Alarm beeper is way too quiet to be heard).

This should take a couple of hours but took me much longer as Crutchfield provided the wrong relay holder/wiring. However, they did work with me to sort it out.

On a good day mine has a range of 60 yards.

You can also set it to lock the doors when you start the engine, but in my case that also sets off the factory alarm and I have not yet worked out how to defeat that 'feature'.

I have had it in daily use for 9 months now and the only thing that has gone wrong is the battery died necessitating reporgramming, a DIY job. The kit comes with 2 remotes.

If you want to use this on earlier (pre-1986 I would guess) cars that do not have the auxiliary vaccum pump, you will have to deal with the additional complication of lock actuators.
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Old 04-03-2002, 05:51 PM
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I havent had any problems with the alarm since the installation. I honestly couldnt say if the alarm is activated or not. It should be according to the instruction on the MB coupes site. I'll see if I cant get the alarm to go off while the doors are locked in the next day or so.
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  #5  
Old 04-03-2002, 05:52 PM
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Thanks Clay
I appreciate it.
Maurice
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  #6  
Old 04-03-2002, 07:28 PM
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Moedip,

If the alarm goes off when you unlock the passenger door, see if it goes off if you twist the key to the lock position with the door open. It might save you 20 or so steps.

Sixto
91 300SE
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Old 04-03-2002, 07:39 PM
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I'd validate that the actuator has to use the trunk wire. On a W124, using either door wire doesn't set or upset the alarm. The W124 alarm wiring looks just like the 91 W126 alarm wiring.

I'm not arguing with empirical evidence, though.

Sixto
91 300SE
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  #8  
Old 04-03-2002, 07:40 PM
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Re: An alternative solution

Quote:
Originally posted by Thomaspin
If you want to use this on earlier (pre-1986 I would guess) cars that do not have the auxiliary vaccum pump, you will have to deal with the additional complication of lock actuators.
Don't all W126 sedans have a vacuum pump? My 81 SD has a vacuum pump in the trunk just like my 91 SE. Maybe only the pre-86 Diesels have a vacuum pump.

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  #9  
Old 04-03-2002, 07:50 PM
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Re: Re: An alternative solution

Quote:
Originally posted by sixto


Don't all W126 sedans have a vacuum pump? My 81 SD has a vacuum pump in the trunk just like my 91 SE. Maybe only the pre-86 Diesels have a vacuum pump.
Yes. I believe mine is underneath the rear seat.
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  #10  
Old 04-04-2002, 03:50 AM
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Re: Re: Re: An alternative solution

Quote:
Originally posted by goldenbear
I believe mine is underneath the rear seat.
In the SDL? Isn't there a blob of foam with wires and vacuum hoses leading to it in the right rear corner of the spare tire bay?

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  #11  
Old 04-04-2002, 11:49 AM
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That's what I've been told by others - never had to need to investigate myself.
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  #12  
Old 04-05-2002, 09:04 AM
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Hmmmmmm

Moedip....I havenít been able to get my alarm to go off at all.

According to the ownerís manual, the alarm will go off if the brake pedal is depressed with the doors locked and the ignition off.
So I locked the doors with the driverís window down and depressed the brake pedal with a broom stick...no alarm.
I popped the hood with the doors locked...no alarm
I locked the driverís door with the key and then unlocked the passenger side with the key...no alarm. I locked the passenger side with the key with the door open...no alarm.

I tried all of the above with the key & keyless entry.

I canít think of any other way to get the alarm to go off.
Does anyone know of tried & true way to do it? Or should one of the above procedures made it go off? Perhaps my alarm has been disabled with the keyless enrty.
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Last edited by 420; 04-05-2002 at 10:33 AM.
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  #13  
Old 04-05-2002, 09:54 AM
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Hi Clay - that is what I was worried about. I have read sevral times of problems installing aftermarket remote car starters, alarms and door locks on Mercedes. The install you did sounds so easy I am tempted to try it. Maybe we can get lucky and either Dave Petryk or Mike Tangas will join the discussion and give us some help to keep the factory alarm so it works with the remote. (hint hint):p :p :p
Maurice
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  #14  
Old 04-05-2002, 01:51 PM
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Code Alarm and the MB factory alarm

FWIW, the Code Alarm preserves the working of the factory car alarm. (See my post above for the one exception - I have disbaled the 'lock doors on start' to avoid having the MB alarm go off - otherwise, the MB alarm functions as designed).

The Code Alarm has a lot of programmable options, as well as a panic button mode. It also offers a starter disable option (you need another - heavy duty - relay for this) but that s/b redundant with the MB alarm remaining fully functional.

One final generic thought on remotes - true for my Code Alarm and the wife's factory remote for the 1999 E320 - hold it under your chin pointed upwards when you press the button and the range is vastly increased (at least 2x) - must be something to do with the skull acting as a parabolic reflector. Of course, you also fry your brains in the process....
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  #15  
Old 04-05-2002, 02:25 PM
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420,

Check the alarm controller in the passenger footwell. Lift the mat and carpeting and remove the board. There should be an approx. 6" x 10" box with 2 long connectors with about 12 pins each. When the door switches get flaky, a common fix is to disable the alarm by disconnecting the controller.

Sixto
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