viper 791 needed key wont start.
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=94851
Printed Date: May 15, 2024 at 5:26 PM
Topic: viper 791 needed key wont start.
Posted By: mycrobyte
Subject: viper 791 needed key wont start.
Date Posted: June 16, 2007 at 3:46 PM
The system has been installed for over 2 years, no problems. Today I shut the car off to get gas and when I went to start it with the key it didn't start, no click no anything - but the accessories turn on and the door locks all click open?? If I use the remote starter then it works fine, I pop the key in the ignition and off I go. If the key isn't in the ignition the system shuts down like it is supposed to. If I disconnect the main harness to the brain, and the harness to the xtreme relay box and jumper the yellow wire (it looks like the only one which is cut) then the car still doesn't start. Any ideas??
Replies:
Posted By: enice
Date Posted: June 16, 2007 at 4:53 PM
Disconnect the relay pack from the ribbon. Try to turn on the car. If it doesnt turn then its most likey the relay pack that is defective. Reason being is that it starts with the remote is because the relay pack supplies power to the starter. It may be that when the car is off the starter cut off wire which is green and purple are are not connected to each other. What you can do to test this is to use a DMM to test if both wires are connected to each other when the car is not armed and off. with the DMM use the ohm setting connect the black to either side and the red to the other and see if it gives a read. When armed it shouldn't give you any read but when its disarmed it should. You may need a new relay pack. Good Luck
Posted By: KarTuneMan
Date Posted: June 16, 2007 at 5:40 PM
What kind of car.......? What type of bypass module? Starter kill?
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Posted By: mycrobyte
Date Posted: June 16, 2007 at 6:00 PM
Thanks, Is the ribbon the large gauge wires which are soldered to the relay pack and connected with the large harness? Or is this the smaller gauge wires which plug to the pack? Either way, I have no resistance when armed or not. (I am testing at the point where the green and purple are connecting to the car's yellow starter wire) Either way the car doesnt start with the key, I even jumped the green and purple to ensure connection. If I disconnect the lage gauge harness to get a measure of just the relay pack (taking the car out of the equation) then I cannot arm or disarm the car. When trying to start the car with the key I see 0.3v on the starter wire. When starting with the remote I get the 12v. Perhaps this is ignition switch issue and not a problem with the viper unit? I see no popped fuses.
Posted By: mycrobyte
Date Posted: June 16, 2007 at 6:02 PM
Sorry, 2003 Dodge Durango with a 500M relay satellite
Posted By: JWorm
Date Posted: June 16, 2007 at 6:10 PM
Any lights (ABS, Air bag, check engine) on after you remote start the truck?
Do the pink/black and RED / lt.blue wire in the trucks ignition harness still have constant 12v?
Posted By: enice
Date Posted: June 16, 2007 at 6:39 PM
if having the green and purple wire tested with the DMM do not give you resistance then connect the green to purple and get yourself another relay pack. Just make sure that when you are testing it to unplug the small ribbon connected to the relay pack.
Posted By: mycrobyte
Date Posted: June 16, 2007 at 6:40 PM
No lights on when remote started and yes, 12v present when vehicle is off at both of the wires.
Posted By: mycrobyte
Date Posted: June 16, 2007 at 6:50 PM
Enice, No resistance between the green and purple with the small harness disconnected. If I jumper the green and purple the car still wont start with the key. (with the small harness connected or disconnected and also with the large relay harness connected or disconnected) The car will start if I put the key in the ignition and jumper the purple to 12v.
Posted By: enice
Date Posted: June 16, 2007 at 8:23 PM
Cut the green wire and cut the purple wire and connect to each other (ign side not relay pack side)and leave it connected. Now try turning on the car. it should turn on since it turned on with the remote start. Also do not jump wires, you can do more harm then actually good.
Posted By: mycrobyte
Date Posted: June 17, 2007 at 12:02 PM
No luck. I'm going to try to replace the ignition switch and see if that fixes the problem.
Posted By: enice
Date Posted: June 17, 2007 at 12:36 PM
Before you do that with a dmm you ground the black lead and tap the green wire(heavy guage) with the red lead. Turn the key to crank. If it shows 12v then the switch is fine. The yellow wire is your starter wire, its cut in half for the cut off. The key side goes to the green heavy gauge wire and starter side goes to the purple wire. Reconnecting them back together should fix it. If it doesnt then go to the fuse box and check if the starter fuse is blown.
Posted By: mycrobyte
Date Posted: June 17, 2007 at 3:23 PM
Alrighty Enice!!! So, I thought I checked all the fuses but did not look at this one because I figured it wouldnt work with the remote start if the ignition #2 fuse under the hood was blown. Sure enough, 20A fuse was popped. Any ideas what would cause that to happen? Your advise is so much appreciated. I've popped a beer and am toasting you now. Cheers mate!!
Posted By: peterubers
Date Posted: June 17, 2007 at 3:31 PM
well done!
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