viper 791 shuts engine while driving

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wowbw7

Member - Posts: 13

Joined: November 22, 2004

Posted: February 01, 2006 at 2:33 PM / IP Logged

Viper 791xv installed in a 97 S10 Blazer about a year ago. have remote start, door lock and rear hatch release functions hooked up. no shock sensor installed. all functions have worked until just recently. while driving, door locks cycle on & off once or twice then engine dies. this happens while driving! put tranny in neutral, and engine will only start with remote...not key. also door lock feature works, but not unlock or rear hatch release. any ideas? thanx in advance for any help

gus1

Gold - Posts: 1,013

Joined: October 15, 2003

Location: Canada

Posted: February 01, 2006 at 2:41 PM / IP Logged

The 791 has only starter kill, not ignition kill.

How can it shut the ignition off and shut down the truck?

Check your negative battery terminal to see if it's loose....

Gus

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

bazzgazm

Copper - Posts: 113

Joined: June 06, 2004

Location: United States

Posted: February 01, 2006 at 2:55 PM / IP Logged

I agree. Or alternator.

gm's do funny things when the batteries die. I had a remotestart/alarm/keyless in a malibu and when the batt was almost dead i could hit the unlock button and pop the trunk =) stupid peices of mess.

kaezoo

Copper - Posts: 125

Joined: April 26, 2005

Location: United States

Posted: February 02, 2006 at 7:17 AM / IP Logged

Sounds like it might be the ignition switch going bad, particularly since you can start with the remote but not the key. Could one of the ignition wires have been pulled loose in the factory harness at the switch?

Chris Luongo

Platinum - Posts: 3,746

This member consistently provides reliable information

Joined: May 21, 2002

Location: Massachusetts, United States

Posted: February 02, 2006 at 7:25 AM / IP Logged

I like kaezoo's suggestion---- the Viper probably has the ignition-controlled doorlocks turned on, and if the car's factory ignition wire is going on and off, the locks will cycle.

wowbw, when the engine dies while driving, how about the other features? Climate controls, radio.... do they remain on?

If ONLY the engine dies, but the other stuff remains on, I would guess at the pink wire being intermittent, as kaezoo says.

Perhaps you could temporarily tape four small lights onto the dash?

Connect each one, respectively, to the pink, white, orange, and brown wires in the steering column. Label them so you know which is which.

(Ground the other ends of the bulbs' wires, of course.)

Take the car for a ride, and see if any of the lights go out as you drive along.

wowbw7

Member - Posts: 13

Joined: November 22, 2004

Posted: February 02, 2006 at 10:33 PM / IP Logged

can't get to the car 'til next week, but I sure appreciate the suggestions. I'll check out each one. it's happened twice, during the daytime & the radio wasn't on, so I can't say on the accessories working or not. a question about the loose ignition wire..does this cause the only-starts-with-remote thing? turning the key to start does nothing..thanx again, guys...

wiretapper

Copper - Posts: 166

Joined: December 11, 2003

Location: United States

Posted: February 04, 2006 at 3:07 AM / IP Logged

9 yr old S-10 blazer? I suspect a bad ignition switch. If the alarm sees an on/off signal from an internal intermittant ign switch connection where (I presume) the alarm wiring is connected, it will cycle the locks. The "engine dying" thing will also be directly related to a bad switch.

It will usually remote start even with a bad switch because the start signal is generated downstream from the switch. Also, it will STILL get the power to start it because the remote start wires (again, I'd assume) are connected to the RED / rd-white wires that feed 12v to the switch. My friend has been using his '94 full size Blazer this way for the past 2 yrs! No start signal from the key, but it remote starts every time. ...some people..... viper 791 shuts engine while driving -- posted image.

There are many other suspects there too, but eliminate a bad switch first. You'll be ahead of the game that way.

Also, you may want to do an OBDII scan on it. '97-up will show an event history that might reveal why the engine dies. Sometimes it doesn't trigger a code, but it will show up in an 'event history' scan. You can also put the scantool on it while driving, set it to 'real time'.

If it starts right back up every time, batt and alt are fine. A simple voltmeter test can determine that. You may have to dig further into the BCM, or ECM. The scantool is your friend.

Mwsounds

Copper - Posts: 61

Joined: January 04, 2005

Location: Alaska, United States

Posted: February 04, 2006 at 9:36 PM / IP Logged

Mine did that to me a few times. It turned out my Alarm brain got wet. Make sure your car is not leaking as well.

Thanks,

Mike Ward

Get it done right the first time!

wranglercory

Copper - Posts: 53

Joined: January 27, 2005

Location: United States

Posted: February 08, 2006 at 11:15 AM / IP Logged

recheck all of your connections and the main ign. harness

wowbw7

Member - Posts: 13

Joined: November 22, 2004

Posted: February 17, 2006 at 2:52 PM / IP Logged

replaced switch harness last week. rewired Viper to new harness. no problems with car stalling since, but Viper still doesn't function. no unlock function, no rear hatch release. blue led flashes constantly, and alarm and lights going off all the time. only thing I have hooked up now is remote start & remote kill. they work fine. is my Viper 'brain' fried?

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