jeep to shop and the alarm is the cause?
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=97021
Printed Date: May 02, 2024 at 10:52 AM
Topic: jeep to shop and the alarm is the cause?
Posted By: OrkinYards
Subject: jeep to shop and the alarm is the cause?
Date Posted: September 10, 2007 at 12:47 PM
I've had a Python 881xp on my Jeep for atleaset 3 years now if not more. I was pulling out of my garage yesterday and the jeep just cut off - when I went to start it back it turned over but wouldn't crank. I had it towed to the jeep dealer and after spending an hour they called to tell me my Jeep had all kinds of electrical problems and wanted to know about the alarm. I went down there to have a look and he claims that the diagnostic plug won't power up their equipment and immidiately assumed it was the alarms fault. There is a purple and white wire that do t-tap into the same color wires at the diag. plug. I looked up the 455t manual and it seems that those would be correct location for the wires. He was quick to admit they have no troublshooting ability for stuff that isn't theirs, and because he can't get his diagnostic equipment to power up on my jeep and he sees wires he doesn't know what they are they are blaming it all on the alarm at this point. Does anyone have any ideas? Like I said it has been installed and working for years now - is it possible that the alarm is the reason that the jeep won't start? I can't tow the thing all over the place trying to get it fixed and at this point they said they can spend 3 hours just trying to figure out what is wrong with it. Any help would be much appreciated! ------------- 1998 Jeep Grand Cherokee Limited 5.9
Replies:
Posted By: shaip99
Date Posted: September 10, 2007 at 6:25 PM
a few thing that i have in question whatis the model and year of the jeep but you can check some things no mater what the vehicle depnding on where they tapped into the wires it is possible that some of the wires broke over time heat and cold can make wires brittle. I would go to each point that the alarm is tapped into the car and chech the connections. hopefully whoever did the install soldered and taped all the connections if they used t-taps that is your likely problem as t-taps tend to break a few of the strands of the wire and they will break the wire later on but if it is taped pull off the tape and check the connection give it a light pull not to hard if is broken it will come apart fairly easily and tada your problem is found ------------- "Computer games don't affect kids, I mean if Pac Man affected us as kids, we'd
all run around in a darkened room munching pills and listening to repetitive
music."-Kristian Wilson, Nintendo Inc.
Posted By: offroadzj
Date Posted: September 10, 2007 at 6:33 PM
this is probably a stupid question, but did you make sure the alarm was disarming? If the alarm isnt disarming for some reason, the starter kill will not allow it to start. +1 on checking the questions as well. By the sounds of the wire on the diag plug being tagged, it sounds like a 456cw was used for bypass... therefore it is probably an 04+ Jeep... please correct me if I am wrong though.
HTH
Kenny
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Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205
Posted By: JWorm
Date Posted: September 10, 2007 at 6:50 PM
It has to be a 1996-98 Jeep Grand Cherokee because of the fact the poster indicated a 455t was used.
Have them unplug the 455t and all the harnesses leading to the 881XP from the alarm brain. They shouldn't actually need to desolder any wires from the car to troubleshoot at that point since the wires are no longer completing the circuit with the alarm and doorlock module.
I highly doubt the alarm/remote start is to blame.
Posted By: offroadzj
Date Posted: September 10, 2007 at 9:05 PM
ok, so i cant read. Please ignore probably 75% of my post.. lol. Sorry for the poor info.
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Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205
Posted By: OrkinYards
Date Posted: September 11, 2007 at 8:03 AM
Thanks for all the help guys - a lot of it was done with t-taps...so I will go and check all of that. If the ignition kill is activated will it even turn over, because my jeep will turn and turn all day, just isn't getting spark... So if I unhook all of the alarm wires from the brain and where they tap in if they aren't soldered wires then effectively the alarm isn't installed - meaning there is no way the alarm is causing an issue? Great info! I'll go check it sunday when I get back in town and post back if that fixed the problem ------------- 1998 Jeep Grand Cherokee Limited 5.9
Posted By: JWorm
Date Posted: September 11, 2007 at 9:39 AM
There is no ignition kill. A starter kill would have been installed. The alarm only prevents it from cranking.
T-taps can actually break a wire in half if installed correctly. It may have happened over time because of vibrations. To eliminate the alarm as being the problem you would need to verify that the factory ignition wires are still getting voltage after where the T-tap was installed. I would say the probability of this being the problem is small.
A more likely cause is a bad fuel pump, computer, or many other possible things.
Posted By: xtremej
Date Posted: September 11, 2007 at 9:41 AM
Make sure none of the connections were the t-tpas were used is broken ie not letting current through. If you lost an ignition wire I beleive your fuel system would not operate, but it would allow it to turn over. Make sure to unlug the 455t and double check those connections to the twisted pair wires @ the diagnostic plug.
Posted By: OrkinYards
Date Posted: September 11, 2007 at 10:32 AM
Ok - lots to check but I should be able to accomplish all of that! Sure would be great if the jeep cranked right up, it was just so random how it happened - literally no stall, sputter, or anything - just cut off and wouldn't come back. So does the starter kill allow the car to turn over or does it literally kill the starter motor meaning there would be no turning over or anything? ------------- 1998 Jeep Grand Cherokee Limited 5.9
Posted By: xtremej
Date Posted: September 11, 2007 at 10:45 AM
It will not let it turn over.
Posted By: customak47
Date Posted: September 12, 2007 at 12:29 PM
from your posts it sounds like there is a blown fuse in the vehicle. If the vehicle cranks and doesn't start and no power at diagnostic plug, then there is a power issue somewhere. A direct question for the dealer you should ask or maybe they told you, did the dealer scanner not power up at all or did it power up and the scanner couldn't establish communication with the computer. If the scanner didn't power up at all, the first thing the dealer should have done was check all the fuses. If there is no communication with the computer, then it could be a cut wire or a bad computer. I had a couple of chrysler cars blow the ignition fuse on a rainy day for whatever reason that didn't even have aftermarket equipment on them. Replaced fuse and was just fine. What area do you live in?
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My rifle is my friend...
Posted By: OrkinYards
Date Posted: September 18, 2007 at 8:21 AM
It would not power up their equipment and they blamed it all on the alarm - I tested and it did not have ground for whatever reason, I grounded that wire however I am still very curious as to why it didn't have ground. They have since come back and say that they can power up their equipment but don't have communication with the engine and that the computer needs replaced, I happened to have the factory computer (i had a mopar performance replacement in there) and haven't heard back since then so hopefully this morning there will be good news, but the way this has gone so far I am not very opptomistic about it. I am in Nashville, TN - I really wondered the same thing about the fuse....I checked the ones under the hood but didn't think there would be one inside that was going to be tied to the ignition system and all that, could be wrong though... ------------- 1998 Jeep Grand Cherokee Limited 5.9
Posted By: harrisell1
Date Posted: October 16, 2007 at 6:45 PM
It sounds like the crank senor on the bell housing went bad. If it's cranking but not turning over.
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electronics
Posted By: KarTuneMan
Date Posted: October 16, 2007 at 9:40 PM
90% of the guys (techs, they call themselves) at the stealerships..... if it's not in the book....it doesn't exist!. Come on boys.... troublshoot. This is the problem with "book", or "flat" rate! In too big of a hurry to get on to the next job. -------------
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