1990 merc 300 sel driver unlock only

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mad_urban

Member - Posts: 13

Joined: September 21, 2006

Location: Texas, United States

Posted: May 28, 2008 at 2:08 PM / IP Logged

I am installing a scytek p10 into a 1990 mercedes 300 sel. I have read all about the vacuum locks, but the car owner wants to have it set to unlock the driver's door first, then the others. The two problems I ran across are: 1) I haven't seen any programming options for this on the alarm and 2) I don't even know if it is possible on this car. When you unlock it with the key, all the doors unlock, and since all locks seem to be controlled by the actuator in the driver's door, it seems to me that unlocking the driver door will cause the rest to unlock as well. I have a feeling there is nothing I can do to make it work like they want, but if anyone has a solution it would be very helpful.

Also, will I run into any unforseen problems with the 2 relay set up for the door locks or is it fairly straightforward? Never done a vacuum door lock system before, so any tips would be greatly appreciated. Thanks.

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chriswallace187

Gold - Posts: 1,661

Joined: March 11, 2002

Location: Pennsylvania, United States

Posted: May 28, 2008 at 10:52 PM / IP Logged

Wow...fun vacuum locks.

Much credit to you for giving this a try mad_urban. Priority unlocking is definitely possible with an aftermarket piece (though I haven't read the manual for that particular Scytek, if it has a wire described as "2nd unlock" or "passenger unlock" it is capable of doing the locks that way).

Unfortunately I think there really isn't a good way to set up an aftermarket keyless entry to do priority locking on a car like that.

Basically you'd need to disconnect the wire to the driver's actuator as it stands right now. You'd then need to find a way to actuate the vacuum circuit for only the driver's door, which would probably involve hacking into the vacuum control module.

If that worked, you'd need to add a switch to control the door locks, since it couldn't be done by moving the actuator the way they designed it.

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howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: May 29, 2008 at 6:07 PM / IP Logged

The only way to do this would be a separate solenoid for the driver's door, vacuum wiring to lock all then a separate feed from first unlock to do drivers door sec lock to vacuum, 2 x low current from alarm + 3 relays, if it wan't 5mins past midnight I'd tell you how, also good luck finding room to mount the solenoid! Look for a rubbery tube? in that floor section, there should be a yellow blue and a brown, ground the yellow/blue for 15 secs to close windows and roof.

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1990 merc 300 sel driver unlock only

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