viper 791 problems
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=66202
Printed Date: August 27, 2025 at 3:29 AM
Topic: viper 791 problems
Posted By: crash103k
Subject: viper 791 problems
Date Posted: November 13, 2005 at 6:02 PM
i have just got done with my install on a ford focus 03 the problem i'm having is that when i remote start the car the starter keeps cranking even after the car is started. i relearned the tach and its still doing it. also when i arm the alarm all doors loock. but when i unarm the alarm only the pasenger door unlocks. any help is greatly app. and thanks in advance
Replies:
Posted By: mo12v
Date Posted: November 13, 2005 at 6:06 PM
What wire on Vehicle do you have TACH wire hooked to
& Door UNLock wires??? Due To Accessory Power Loss At Generic Electronic Module,Power Door Locks Will Become Inoperable 2 Minutes After Last Door Is Locked And Closed. To wake up the G.E.M Send A Negative Pulse To The BLACK / YELLOW Driver Door Pin Wire With the Unlock Pulse. Diode Isolate, Cathode (Band Side) Of Diode Faces Away From Vehicle Wires. ------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: crash103k
Date Posted: November 13, 2005 at 6:10 PM
tach is hooked up to the black / green wire at the ignition coil. door ulock is to the white black wire in driver kick panel
Posted By: chris354
Date Posted: November 13, 2005 at 7:05 PM
With the newer dei stuff the only reliable way to get a tach signal on the fords is use a fuel injector wire.
Posted By: mo12v
Date Posted: November 13, 2005 at 7:17 PM
Check: | Tach Signal | BLACK/ ORANGE | AT IGNITION COIL |
Also.............chris354 has a point............any ODD color on F I........but I have not had problems with Coil on Ford yet...... | Power Lock | BLACK/ ORANGE | DRIVERS KICK PANEL* | | Power Unlock | BLACK / YELLOW | DRIVERS KICK PANEL |
Due To Accessory Power Loss At Generic Electronic Module,Power Door Locks Will Become Inoperable 2 Minutes After Last Door Is Locked And Closed. To wake up the G.E.M Send A Negative Pulse To The BLACK / YELLOW Driver Door Pin Wire With the Unlock Pulse. Diode Isolate, Cathode (Band Side) Of Diode Faces Away From Vehicle Wires------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: crash103k
Date Posted: November 13, 2005 at 7:24 PM
ok so for now i turned the tach mode off and its just running the starter for the default .6 sec and it seems to be working. as for the door lock and unlock i'm getting kinda sketchy results from them when i arm the alarm and all doors are unlocked they will all lock. if i arm the alarm and only one door is unlocked (ie: the driver door unlocks when i open it) it wont lock any doors. if i disarm the alarm ONLY the passenger door unlocks. I'm not shure what the diode isolation would do but i will try it i guess MO12V if you could draw that out for me or explain how to hook that up a little more in detail that would be great.
Posted By: crash103k
Date Posted: November 13, 2005 at 7:29 PM
black orange black yellow are they still 5 wire systems or do i just tap into them with the default (-) (+) from the brain?
Posted By: mo12v
Date Posted: November 13, 2005 at 7:37 PM
Use a 1N4001 Diode or similar.......
Diode has a CATHODE ( Band on Diode ) and an ANODE side.
This allows ( basically ) a ONE WAY Current. This will prevent "feedback" from whatever you are hooking up
See: https://www.the12volt.com/diodes/diodes.asp for better explanation Door Locks are NEGATIVE Pulse........... ------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: crash103k
Date Posted: November 13, 2005 at 7:49 PM
i understand what a diode is and how they work. but what i dont understand is what thats going to do or where to put it?? thanks in advance
Posted By: mo12v
Date Posted: November 13, 2005 at 7:55 PM
To wake up the G.E.M Send A Negative Pulse To The BLACK / YELLOW Driver Door Pin Wire With the Unlock Pulse. Diode Isolate, Cathode (Band Side) Of Diode Faces Away From Vehicle Wires In other words..........From your UNLOCK wire of your 791, hook a wire & Diode ( facing the Cathode side toward 791 ) to the Driver Door PIN to wake up the G.E.M. after the doors have been locked for over 2 minutes ------------- MO
Don't Learn from Others Mistakes
You Might Be the One That Knows.
Posted By: crash103k
Date Posted: November 13, 2005 at 9:05 PM
thats way better i understand now thank you i will try that tommoorow and let you guys know the results
Posted By: crash103k
Date Posted: November 15, 2005 at 1:24 AM
Ok just so you all have the follow up. I got the install on my customers ford focus done. It was not an isolation issue.
On my wire schematics it showed the 5wi door lock and unlock but not the (-) trigger door lock wires
Thanks in part to mo12v for the correct wire colors I taped into the correct wires this time.
Prior I grabbed the motor wires (I talked with a second installer on this issue and he said that’s common in fords. one door lock motor will be a slave and one will be a master. I taped the slave for the unlock wire the first time so only that door would unlock)??? News to me!!!
Thanks for your help mo12v and no door lock or unlock issues anymore...
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