Q about Vacuum lock relay diagram
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=42371
Printed Date: May 28, 2024 at 3:09 PM
Topic: Q about Vacuum lock relay diagram
Posted By: eiknujrac
Subject: Q about Vacuum lock relay diagram
Date Posted: November 06, 2004 at 3:13 PM
According to the relay diagram for a Vacuum lock system on this site, you need a Fused 12v source. Does this mean I can use for example the 12v to the ignition or cigarette lighter that is already fused? Or do I need to draw power from the battery with an inline fuse matched to the relays rating? And one more question, the diagram shows 2 wires that send a 2 second negative pulse. My alarm has two choices of wire. One that sends a (-) Lock/ (+) Unlock, and one that sends a (+) Lock/ (-) Unlock. Which one would I use? And would I split it to send to each relay? Ps. The Alarm is a Crimestopper CS2016 FM, and the car is a 1991 Benz 300E
Replies:
Posted By: eiknujrac
Date Posted: November 06, 2004 at 4:37 PM
I found the answer to my second question, but still don't know whether to use a fused wire straight off the battery, or a fused source like the cigarette lighter or ignition wire. Anyone?
Posted By: Ben.c
Date Posted: November 06, 2004 at 5:05 PM
You could use the constant power source from your alarm , just splice this power source off that wire but connect it after the alarm fuse. I would not reconment useing something like a cigarette lighter as this in most vehicles is a accessory power only , I have always picked up the constant power source from the ignition switch for alarm and central locking. If your alarm has on board relays for locking it should show you how to wire it for a vacuum locking system in your install manual , but if it has only got a selectable negative or possitive pulse outputs that are only rated in the milliamp range you would have to use relays. ------------- ozy installer
Posted By: eiknujrac
Date Posted: November 06, 2004 at 5:28 PM
Posted By: spicyburritto
Date Posted: November 07, 2004 at 6:02 AM
eiknujrac, i had the same question about which wires to use for the relay. What did you find out as far as +) lock/(-)unlock or the opposite for the mercedes vacuum locks?
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Think about it first.
Posted By: Ben.c
Date Posted: November 07, 2004 at 6:43 AM
If you follow the diagram on the web site you should use negative pulse from your alarm for lock and unlock but make sure your system allows the pulses to be delayed to at least 2 seconds . The wire shown at the bottom of the diagram is the blue or green wire leeding to the pump on a merc ( found under the back seat ) this wire is cut and placed in the circuit .
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ozy installer
Posted By: spicyburritto
Date Posted: November 07, 2004 at 7:05 AM
Thanks Ben, so you're saying that i should use a negative pulse for both the lock and unlock functions? My alarm system (Alpine SEC-100s) has three leads for the door locks- one that says "unlock (driver's door) [-] (+ lock)" one that says "Lock [-] (+unlock)" and one that says "All doors unlock (-/+)". I believe each of these can be configured to be + or -, and i plan to ignore the driver's door lead. Do you have any idea which wires i should hook into the circuit and exactly how? Do i need to buy a SPDT relay? any help would be much appreciated. thanks, barrett ------------- Think about it first.
Posted By: hagmanti
Date Posted: November 07, 2004 at 8:48 AM
When you press the lock button on your remote, the (-) unlock/(+) lock sends a positive signal, and the (-) lock/(+) unlock sends a negative signal.
Reverse the above for pressing unlock. The diagram assumes you're working w/ the negative pulses, so ignore the (+) part and just look at the (-) part-- often green will be (- lock) and blue (- unlock).
So, in other words, you need to use both wires-- one (- lock) goes to your "locking" relay (the one that has pin 87 connected to ground), and the other to the "unlocking" relay (the one that has pin 87 connected to 12V).
Spicyburritto-- the wire that says driver's door is probably the better one to use if you're not hooking up both-- otherwise you'll probably have to hit unlock twice to unlock your doors. Check w/ your manual to be sure...
You will have to buy 2 SPDT relays, rated at least 12V and at least 5 amps.
Posted By: spicyburritto
Date Posted: November 07, 2004 at 12:54 PM
thanks hagmanti, i appreciate your in-depth explanation. Is there any trick as far as setting up the relays? Do i just need to solder the correct wires to the corresponding pins on the relay and then insulate them somehow? Or is there a better way?
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Think about it first.
Posted By: Ben.c
Date Posted: November 07, 2004 at 2:02 PM
Make you life easy a buy some insulated female spade connectors and some crimpers , crimp them onto your wires and plug them onto the appropiate pins of the relays. Alot neater and easier then soldering onto relays. ------------- ozy installer
Posted By: hagmanti
Date Posted: November 07, 2004 at 2:03 PM
I actually generally use spade-type disconnects for this-- crimp them to a piece of wire and then use a needlenose pliers to put them on the relays. (It's one of the few things I don't solder). Then I get insulation for free. (And it's a PITA to get electrical tape in between those pins!)
11
Me
Posted By: hagmanti
Date Posted: November 07, 2004 at 2:09 PM
Or, what Ben.c said. :)
Me
Posted By: spicyburritto
Date Posted: November 07, 2004 at 2:09 PM
Thanks for your help guys, i'll post again if i have any problems with that. I appreciate it, barrett ------------- Think about it first.
Posted By: spicyburritto
Date Posted: November 09, 2004 at 7:24 AM
Two more questions on this power locks problem. I've got my two relays, and i'm going to put them in soon. Do i just need to insert the relays on the wire somewhere between the driver's door and the vacuum pump? And if i do that, will the driver's door lock and unlock when the vacuum pump is activated? I had the driver's door panel taken apart last weekend and it didnt look like that door is vacuum controlled, like maybe it is just manually controlled. Does anybody know about the driver's door locking mechanism in an 84 mercedes 300 SD? thanks, barrett ------------- Think about it first.
Posted By: hagmanti
Date Posted: November 09, 2004 at 7:32 AM
To your question about relays-- yes. Cut that wire and put the relays in between.
I don't know that model year specifically, but I've never seen vac locks that didn't control every lock in the car (unless somebody did something aftermarket).
Lots of things I haven't seen, of course....
Me
Posted By: spicyburritto
Date Posted: November 09, 2004 at 3:53 PM
Yeah i swung by a local mercedes mechanic today, and it turns out that only after 86 did mercedes put a vacuum actuator on the driver's door. In my model, the driver's door lock assembly is completely manually controlled. I will need to buy a solenoid and hook that up as well. Do you know where i might find a solenoid that would be compatible?
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Think about it first.
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