Vacuum lock system and Very hot wire
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=24974
Printed Date: November 07, 2025 at 6:21 AM
Topic: Vacuum lock system and Very hot wire
Posted By: burnerofhells
Subject: Vacuum lock system and Very hot wire
Date Posted: January 20, 2004 at 9:56 PM
I finally got my keyless entry to work in my 1993 VW jetta but i noticed that if I lock and unlock the car multiple times in a row (4 or more) the wire that goes to the lock switch part, from the brain, is getting very hot. Is this normal when the car is locked/unlocked repeatedly?
Since it is a vacuum lock sytem it uses a 4 second pulse, could this be the reason? Should i worry about this?
It is the wire from terminal 87a of the extermal relay that is gettin hot. Check it out below.
https://images.cardomain.com/member_images/5/web/185000-185999/185158_107_full.gif
Replies:
Posted By: burnerofhells
Date Posted: January 20, 2004 at 10:05 PM
the wire from the vacuum pump to the door switches i used was the RED / black wire.
OK i just realized something... it doesnt matter how many times i unlock/lock the doors the wire is just getting really hot like power wont stop running through the wire. I disconnected it in fear of fires. What may the problem be?
Posted By: Velocity Motors
Date Posted: January 21, 2004 at 1:41 AM
What wire colors did you use and where in the car did you tap the keyless entry wires to ?
-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: burnerofhells
Date Posted: January 21, 2004 at 1:56 AM
I taped into the BLACK/ red wire right at the vacuum pump. Sould i have done it at the drivers kick pannel?
why would it make a difference?
I noticed now that my driver door does not lock with the vacuum system anymore and has to be manually locked. It turns out there is a resistor that got so hot it melted a hole in my drivers door lock.
Posted By: Velocity Motors
Date Posted: January 21, 2004 at 2:06 AM
It's just the the wires at the switch would power a relay that would send a signal to the pump to activate the lock and unlock. According to some of the notes that i have, the Jetta uses a (+) trigger wire to activate the relays for the pump. You didn't have to go straight to the pump according to the wiring information that I have.
-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: burnerofhells
Date Posted: January 21, 2004 at 2:08 AM
But would going straight to the pump have caused this?
i am using a positive pulse
Posted By: Velocity Motors
Date Posted: January 21, 2004 at 2:11 AM
On the diagram that you have, what is the " DOOR LOCK HARNESS " module suppose to be ? Is this on the car or is this the module that you have installed into the Jetta ?? I ask because all the other systems that I have installed into where I had to go tot he pump, I used 2 relays, not one. ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: burnerofhells
Date Posted: January 21, 2004 at 2:44 AM
It is my ungo ms2004 alarm.
The diagram i have is what te install manual said to do.
How would i wire it up with 2 relays?
Keep in mind I must be a positive output. Also that the wires coming off the DOOR LOCK HARNESS are the wires i have to work with from the alarm.
Posted By: burnerofhells
Date Posted: January 21, 2004 at 2:47 AM
Im pretty sure the alarm has one built in relay. I think this is why all the wires coming off it are labeld like a realy.
Also It was the wire that goes to the door locks that got very hot.
Posted By: Velocity Motors
Date Posted: January 21, 2004 at 9:30 AM
Vacuum Type Door Locks------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: burnerofhells
Date Posted: January 21, 2004 at 12:29 PM
ok... but which wires form my wiring harnes on my alarm go where on that diagram?
Posted By: Velocity Motors
Date Posted: January 21, 2004 at 12:52 PM
The first relay pin 86 is your alarm's LOCK (-) output and the second relay pin 85 goes to the UNLOCK (-) output of the alarm ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: burnerofhells
Date Posted: January 21, 2004 at 7:28 PM
Which LOCK (-) output should i use from my alarm?
Lock 87a (normally closed) or Lock 30 (common)
Which UNLOCK(-) output should i use from my alarm?
Unlock 87a (normally closed) or Unlock 30 (common)
Any what do i do with the last wire the Lock/Unlock 87 (normally closed) wire?
Do i just tape the ends of the other wires and not use them?
Sorry for so many questions.
Posted By: burnerofhells
Date Posted: January 21, 2004 at 10:58 PM
For get it. the original diagram works now. Im not sure why it burnt up a resistor and melted a hole in my door locks but now that i ripped the resistor out she works perfectly.
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