Printer Friendly Forum Posts - 06 ford superduty diesel, viper 791xv

I've installled, or attempted to, a Viper 791xv into my 2006 Ford SuperDuty Diesel. I'm having a problem getting the door locks to work correctly. I can get the system to lock the trucks doors, but it will not unlock them. I've tried everything..

The 791xv has green and blue wires for the lock.

I have the green hooked to the trucks WHITE/ Red wire and that lockes the doors, but the blue wire doesn't unlock no matter what I hook it too..? I've tested with a DMM and both the green and black wires show a positive 12v when you hit the remote lock/unlock buttons...is this correct? What do I do??

Thanks!

unlock should be a blackwhite wire and it should loose 12v when you press unlock on the switch be sure you have the correct wire.

That's what I though - on the truck side there's a WHITE/ red and BLACK/ white wire - both wires are at zero and go to 12v when I press the factory FOB lock/unlock button???? I have the blue wire connected to the truck BLACK/ white but it doesn't do anything...

So can someone tell me what to hook the green and blue wires up to? Funny thing I notice is that the green wire from the 791 shows no voltage change when I press *arm* on the remote, but somehow it manages to lock the system. And this is without the blue wire hooked up...

Does this sound right?? Is the brain on my 791xv messed up?

from the alarm,the blue wire should pulse 12 during lock and read zero or groung during unlock, the lock wire should pulse 12 during unlock and zero or ground during lock. The two wires in the truck should read between 1 to 12 volts at rest, and one should read zero or ground during locking, and the other reads ground during unlocking, at all other times the wires will have constant voltage ( i used 1 to 12 because voltage varies ), the wires that are pulsing twelve with the fob are most likely actuator wires.

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

try switching the green and blue wires to see, since you know it locks you'll be able to check the out put of the alarm this way, if output is good doors will lock when you disarm. also so you can put blk/wht straight to ground and see if the doors unlock, though i wouldn't recommend unless you are SURE its the righ twire

found something interesting Vehicles with keyless entry, the unlock wire is BLACK/ white (-), in the driver kick, door harness or also at the VSM, gray plug, pin 2. The VSM (Vehicle Security Module) is to the right of the accelerator pedal above the transmission hump below the radio. Not accessible from radio opening. Vehicles with keyless entry the VSM shuts down after the doors have been locked for a certain time period, to wake up the system you have to do a relay setup with the door ajar wire i could e-mail you a diagram if you can't find anything, it's also called GEM wake up

it appears that the alarm is doing this:

Green wire - pulses 12v when I hit unlock and nothing (I assume ground) when I hit lock - with this wire hooked to the WHITE/ red at the trucks VSM, I am able to get the doors to lock correctly.

Blue wire - pulses 12v when I hit the lock and nothing (assume ground) when I hit unlock - with this wire hooked to the BLACK/ white wire at the trucks VSM, I DO NOT get the truck doors to unlock.

Odd is that when I test the wires at the trucks VSM and using the factory FOB, I get a +12v on both the WHITE/ red and BLACK/ white wires when I hit the lock/unlock buttons (respectivly). I've tried the blue wire to all the other wires in the gray plug in the VSM and nothing will unlock the doors...

the wires shoudn't pulse twelve, they should have constant voltage always, annd go to ground or zero during lock and unlock, if it's already locking then you have one of the wires, all you have to do is find the unlock wire.

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

t&t tech wrote:

the wires shoudn't pulse twelve, they should have constant voltage always, annd go to ground or zero during lock and unlock, if it's already locking then you have one of the wires, all you have to do is find the unlock wire.

That is incorrect....on those vehicles the locks rest at ground. When you hit the "switch in either direction it applies both power and ground directly to the motor legs, without the use of any relays," as quoted from the 5 wire alternating 12V positive door locks area in the lock/unlock diagrams on this site.

It should be a standard 5 wire configuration....do you have a 451M?

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...half of the truth can be worse than a lie. <----Roger Russell said that..

ok well, i apologize joch, i never woked on the vehicle but was simply trying to help from the info he gave, the there's a special relay setup for this, but just for my own curiosity joch, how come he got it to lock without relays, just a thought.

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

t&t tech wrote:

ok well, i apologize joch, i never woked on the vehicle but was simply trying to help from the info he gave, the there's a special relay setup for this, but just for my own curiosity joch, how come he got it to lock without relays, just a thought.

because with factory keyless, those trucks are not 5-wire RAG. they are negative trigger. the ones that do not come with factory keyless are 5-wire.

ok - I'm not an electrical genius here - I have factory keyless - so the 5-wire is NOT what I need??? I'm totally lost as what to do? Am I supposed to hook both the blue and green wires to the same wire in the truck (WHITE/ red???) - I'm still not understanding how I can get the locks to work, but not unlock.. This unit was pulled from my previous 2005 Superduty diesel and they didn't use any relays or anything to get the locks to work, so I assume nothings has changed from 2005 to 2006??

Someone please tell me what to do step by step - This things is driving me nuts and has been down now for 2 days..

well you have negative trigger locks according to ckeeler, who i'm sure is reliable, so you have to find the negative trigger unlock wire, just a question before any further advice, do you have a rocker switch on the driver door.

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

No offence here guys but i did alot starters in ford trucks this year.

And i can't remember 5 wiring any of them.

All the ones i did were negative trigger.

Got it to work, was a simple wire connection problem. posted_image

WHITE/ red locks, BLACK/ white unlocks... no relays needed.