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viper remote start stopped working?

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=100008
Printed Date: May 09, 2021 at 6:14 PM


Topic: viper remote start stopped working?

Posted By: davidas
Subject: viper remote start stopped working?
Date Posted: December 14, 2007 at 4:34 AM

I have a viper 791vx installed on 05 avalanche and it's been working fine for almost 3 years.  Now the remote start doesn't work.  It appears that it's trying to start for like 3 times (light blinks) but fail.  I don't even hear it cranking, only some relay clicking.   Everything on the alarm side seem to be working fine.

I checked the neutral safety, hood pin switch, connections,  and fuses and they all seem to be ok.   Anything else I need to check?  I'm using the DEI 555L & DEI 456G interface modules.   Is there a way to pin point what's causing the problem?  Thanks...




Replies:

Posted By: perly
Date Posted: December 14, 2007 at 5:38 AM
it sounds like a bypass issue. one way to check is to put the key in the key cylinder(but do not turn it) and then try to remote start. if it starts with no problems then it is something wrong with the bypass. I have heard of some bypass "forgetting" their programming this may be your case.




Posted By: davidas
Date Posted: December 14, 2007 at 12:41 PM

perly] wrote:

t sounds like a bypass issue. one way to check is to put the key in the key cylinder(but do not turn it) and then try to remote start. if it starts with no problems then it is something wrong with the bypass. I have heard of some bypass "forgetting" their programming this may be your case.

Thanks, but I tried that one already...





Posted By: splaudio
Date Posted: December 14, 2007 at 3:52 PM
check both of the fuses going to the viper...




Posted By: wiretapper
Date Posted: December 14, 2007 at 9:47 PM
davidas wrote:

Thanks, but I tried that one already...


Yes, but did you......

A.....wait at least 10 minutes AFTER the last failed start attempt? 3 failed start attempts in a row will trigger the Passlock system to shut down for 10 mins.

B.....did you unplug the bypass unit BEFORE trying to start it with a good key in the ignition? If the bypass unit is faulty, it will send a faulty resistance ALONG WITH the good key triggering the proper resistance. 





Posted By: davidas
Date Posted: December 14, 2007 at 10:10 PM

No...  I did not do those....

Thanks, I'll try these first thing in the morning...   will let you know how it goes...





Posted By: JWorm
Date Posted: December 14, 2007 at 10:43 PM
Leaving a key in the cylinder will do nothing. Passlock II requires the key to be turned before the R-code is sent to the BCM.

Passlock II will not prevent the truck from cranking. It will prevent it from staying running. The problem you are having is probably related to the starter wire output.

You need to meter all the ignition, accessory and starter wires to see which are not getting power when the remote start is initiated.




Posted By: davidas
Date Posted: December 14, 2007 at 11:07 PM

JWorm] wrote:

eaving a key in the cylinder will do nothing. Passlock II requires the key to be turned before the R-code is sent to the BCM.

Passlock II will not prevent the truck from cranking. It will prevent it from staying running. The problem you are having is probably related to the starter wire output.

You need to meter all the ignition, accessory and starter wires to see which are not getting power when the remote start is initiated.

That makes sense...

I'll double check those wires...    this are the ones on the relay satellite with heavy gauge wires right?





Posted By: JWorm
Date Posted: December 15, 2007 at 8:45 AM
Yeah, those are the heavy gauge wires. Also check to make sure the harness that connects the relay satellite to the alarm brain is pushed all the way in. It may be loose and not making contact causing the problem you are having.




Posted By: davidas
Date Posted: December 15, 2007 at 1:38 PM

Ok, I took some meter readings on those wires and everything gets power either constantly or when remote start is initiated EXCEPT the PINK ignition output (heavy guage).   Could that be the problem? or will that only have power when engine is running?

Assuming it suppose to have power when trying to start, what signal is needed to get power to that?   (assuming the relay is good). 





Posted By: davidas
Date Posted: December 15, 2007 at 2:16 PM

Well, I found the wire that will turn on the relay for the PINK ignition output.  It appears the relay for the ignition is bad.    I got the whole relay satellite module pulled out.   I just need to find out which ones are the relay coil terminal so I can put power to it and simulate turning the relay on or off to be sure that is the culprit.





Posted By: davidas
Date Posted: December 16, 2007 at 4:47 AM

Well I can't figured out where to tap power to simulate/operate the relay for testing so I started tapping/hitting the ignition relay thinking it could be sticking or something.  After enough hitting, I rewired everything and started it with the key incase the bypass (555L) needs to re-learn the R-code, then shut it off and tried the remote start.  To my surprised.... it started.  Tried it several times testing the shutdown inputs, valet take-over and the pre programmed run time and everything is working.

I guess the hitting did it...    what to do know...  hitting things when everything else fails actually works. 

I appreciate all your help.






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