Power Locks on 84 mercedes

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=42248
Printed Date: September 10, 2025 at 9:54 AM

Topic: Power Locks on 84 mercedes

Posted By: spicyburritto
Subject: Power Locks on 84 mercedes
Date Posted: November 04, 2004 at 5:36 PM

I have an 84 Mecedes 300 SD. I recently bought an Alpine SEC-100S Alarm system for it. I'm having trouble figuring out how to wire the remote lock/unlock into the power locks on the car. I've looked at your diagrams and still don't understand exactly what to do. My alarm system has one lead for a 3 second lock pulse and one lead for a 3 sec unlock pulse, both of which can be configured to be either positive or negative. I've checked out the voltage on each of the wires that comes from the driver's door to the vacuum pump, and there is one that changes from a constant +12 volts to nothing, depending on whether the doors are locked or unlocked. What do i tie into for the alarm system to lock and unlock the doors?

barrett

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Think about it first.

Replies:

Posted By: audiopro111
Date Posted: November 04, 2004 at 5:51 PM

I'm not familiar with that alarm but i used to have a 84 300 d and what i had to do to get door locks to work was to add an actuator to driver door because of the vacuum type door locks the driver door controls all the other doors including trunk...

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AudioPro111

Posted By: spicyburritto
Date Posted: November 04, 2004 at 6:00 PM

I was thinking that since the driver's door controls all the others, that it was the main actuator. Is that not true? How did this actuator that you added work?

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Think about it first.

Posted By: audiopro111
Date Posted: November 04, 2004 at 6:07 PM

yeah it's true but i still needed to add an aftermarket actuator and it woked just fine!

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AudioPro111

Posted By: spicyburritto
Date Posted: November 04, 2004 at 6:38 PM

I understand. Would you happen to have more information on specifically what type of actuator and how you wired it into the power lock system and the keyless entry? Thanks for your help.

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Think about it first.