791xv will not lock doors properly!

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=50405
Printed Date: July 13, 2025 at 1:44 PM

Topic: 791xv will not lock doors properly!

Posted By: beemerz1
Subject: 791xv will not lock doors properly!
Date Posted: February 18, 2005 at 6:24 PM

Almost finished installing the alarm now, but I've got one problem:
When I arm it, the locks will only lock during the 4.5sec (-) pulse. When it's finished, the doors unlock again.

I've connected the green wire ( - lock and + unlock ) to the yellow wire on my stock DEFA Patriot 500x.
The car is a Golf Mk3.

Can anyone help me?

Replies:

Posted By: profuse007
Date Posted: February 19, 2005 at 12:47 AM

| POWER LOCK|yellow/red or gray |+ |driver door harness in kick |
| POWER UNLOCK|RED / black or grn *1 |+ |driver door harness in kick |
*1 Requires a double pulse to unlock.

(+)~200mA, the unit has both polarity, disregard the (-) and only look at the positive.
dont forget to program it to dbl pulse.

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: beemerz1
Date Posted: February 19, 2005 at 5:03 AM

Thanks for the help, but I'm not completely following...

The lock and unlock wire colors are the ones from the DEFA?
Reason why I connected to the yellow wire (might be yellow/red) is that I measured it to be 0V for about 4 sec when I locked the car (with DEFA remote), and 12V for about 4 sec when unlocking (didn't look like double pulse).

The weird thing is that it works as it's supposed to do if I manually gound the yellow wire to lock, and give it 12V to unlock it!

Which wires from the 791xv should I connect the two wires to?
Do you know if I can arm and disarm the DEFA with the 791xv?
That way the DEFA should handle the power locks like before.

Posted By: beemerz1
Date Posted: February 22, 2005 at 7:07 AM

Anyone else who can help me on this?

Please!

Posted By: gus1
Date Posted: February 22, 2005 at 3:17 PM

Use relays to drive the car's lock and unlock wires. It will give them isolation from the polarity switching of the unit. Also.... there may be more current being drawn than the unit can provide. Set unit to long pulse, double pulse unlock.

Test for the proper wires by tricking the door into thinking it's closed (trip the latch), and use the key in the door cylnder and a DMM to verify which wires are lock and unlock.

Gus

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Wherever I go, that is where I end up......