Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > Grand Cherokee Tech
Register Forgot Password?
Search


Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 01-21-2011, 12:26 PM   #1
Newbie
 
Join Date: Dec 2010
Posts: 19

View mckrob85's Photo Album My Photos
Cherokee
Default Its dead :(

Right, as some of you know, i had an alarm issue where by the alarm siren would trigger randomly, and annoy my neighbours.

In the UK we have an insurance system where if an alarm system meets 'Thatcham' class, 1, 2 or 3, you get a better rating and insurance gets cheaper. This is why the USA doesnt seem to have a siren, you have horns to sound the alarm, in the UK dealers fitted Thatcham sirens when new. So anyway, the siren was tucked away behind the ECU, barely visable even with the ECU removed completely!

So i cut the wires running to it and pulled it out, no more siren! Great....

Well no. As now the car wont start. No start and stall, just key turn - silence. All guages and lights work fine. I left it overnight and turned the key the next day and it fired right up, went for a drive, came back, turned off and on a few times and thought problem was solved. Now its dead again, no crank, no start. I thought perhaps its the immobiliser, but wouldnt it start then stall if this was the case?

I've read about shorting the starter solenoid to the battery to start it, does this bypass the immobiliser? Are there any tricks to start it, or perhaps a way to completely remove the security system? I need a way, even if its a little switch running from starter to battery, to have the jeep start as currently its dead in the water

I rang Jeep UK and all he could suggest was jiggling the gear stick while trying to start it, and trying to start it in neutral, other than that they need to hook it up to a meter, which as the jeep isnt moving, isnt an option, and with me having removed the siren box, might be a wasted trip if it throws up no codes.

The battery is a new one, everything functions as normal. Any help desperately appreciated.

1996 ZG Grand Cherokee LTD
mckrob85 is offline   Reply With Quote
Old 01-21-2011, 02:08 PM   #2
CF Veteran
 
dave1123's Avatar
 
Join Date: Nov 2010
Location: Manlius, east of Syracuse, NY
Posts: 4,069

View dave1123's Photo Album My Photos
2000 Grand Cherokee
Default

Frustrating, ain't it! I would like to know how to eliminate the security system also! I'm sorry I can't help you with your problem, but I'll watch your post and offer any help I can. When all is said and done, a simple switch in the ignition circuit works well, has for years before alarm systems were thought of! There are even heavy-duty locking switches that mount right on the battery post used for heavy equipment!

I don't know how you feel, but I don't want a piece of electronic crap telling me I'm not authorized to operate my vehicle!!
dave1123 is offline   Reply With Quote
Old 01-22-2011, 07:18 AM   #3
Newbie
 
Join Date: Dec 2010
Posts: 19

View mckrob85's Photo Album My Photos
Cherokee
Default

I would like too add at this point that using the keyfob unlocks doors and turns red LED off.

Any suggestions?
mckrob85 is offline   Reply With Quote
Old 01-22-2011, 08:21 AM   #4
Junior Member
 
Join Date: Oct 2010
Location: Bethlehem P.A.
Posts: 49

View leadpipe58's Photo Album My Photos
1997 Cherokee
Default

Contact the company that makes the alarm system and ask them how to remove it.
There may be a forum for that like this Jeep forum.
Good luck
leadpipe58 is offline   Reply With Quote
Old 01-22-2011, 10:36 AM   #5
Newbie
 
Join Date: Dec 2010
Posts: 19

View mckrob85's Photo Album My Photos
Cherokee
Default

Its a bog standard OEM Jeep alarm! Just the UK spec differs from the US in that we have a seperate siren.

Took the lid off the PDC and relay 'E' is clicking when turning the key to the start position. Its the starter relay, is this normal? I took it out and switched it with relay 'L' which is the horn relay, and tried again, with exactly the same outcome, just clicking.

Under starting conditions, battery reads 11.85v.

Is there a trick to starting it by shorting something out on the starter motor itself, whilst turning the key? Perhaps battery feed direct to the starter?

Im thinking perhaps its not the immobilizer, as pressing the unlock button on the fob turns off the red LED, which must mean its disabling it.

So, is the clicking normal?

Regards
mckrob85 is offline   Reply With Quote
Old 01-22-2011, 06:19 PM   #6
Newbie
 
Join Date: Dec 2010
Posts: 19

View mckrob85's Photo Album My Photos
Cherokee
Default

Ok! Right, well, problem is in hand, almost solved.

Turns out that the 11.85v isn't enough to engage the starter, and with a jump from my trusty Transit van it fired right up, so now it seems i've defeated the alarm system, and have a running Jeep

Well, tomorrow i will drop test the battery (new at car purchase) and if thats ok then the alternator will need some attention, or perhaps even screwing around with the Jeep cutting and splicing wires during attempts to bypass the alarm, caused the battery to drain.

Ran out of light tonight so will carry this saga on tomorrow, but so far its a thumbs up

VTSS gone, remote locking still works, Jeep alive!
mckrob85 is offline   Reply With Quote
Old 01-22-2011, 06:19 PM
 
 
 
submit to reddit
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
no buS Does not =Dead P.C.M. HELP carfleet mntc OEM Cherokee Tech 8 01-04-2010 02:15 AM
Dead speedometer. 808 xj OEM Cherokee Tech 7 12-23-2009 05:07 PM
cherokee might be dead mynameismyles657@aim.com OEM Cherokee Tech 2 12-12-2009 11:01 AM
dead wobble Jeep85 OEM Cherokee Tech 1 11-18-2009 09:28 PM
Engine Dead!!! xjbuddy OEM Cherokee Tech 9 10-10-2009 10:55 AM

Go Back   Jeep Cherokee Forum > Technical Discussion > Grand Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 04:54 AM.


This site is in no way affiliated with Jeep or Chrysler.

Emails Backup