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Issues with security?

Tiny
PHILLYA85
  • MEMBER
  • 2006 JEEP GRAND CHEROKEE
  • 55,000 MILES
I installed aux lights today and in the process I blew a fuse for the power windows/locks/dome lights. I fixed this fuse in area 20 it was a 10amp fuse and these all started to work again.

Now my keyless entry will no longer work. I rent through the programming steps I found online and these do not seem to work. Both my normal and spare key will not work. While checking everything else the only other problem I see is my digital compass on my dash no longer displays. The temp and all other info displays.

I checked the fuses under the hood and under the dash and from what I see they are all good.

I unplugged the neg from the battery for about 5 mins and hooked it back up and this did not seem to help at all. Not sure what it could be.
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Thursday, September 1st, 2011 AT 3:44 AM

28 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Just when we thought the engineers couldn't get more insane with their use of computers to perform simple, common sense functions that don't require those computers, they still did manage to screw up our electrical systems even more. If you added a factory light package designed for your vehicle, the Body Computer and / or Integrated Power Module has to be reprogrammed by the dealer to know those lights are there, otherwise it won't turn on the power for them.

this guide will help

https://www.2carpros.com/articles/how-to-reset-a-security-system

Blowing a fuse removed power from the computer, just like removing the battery cable, and can cause various computers to lock up. The engineers made it so we can have all kinds of problems from simply replacing the battery. That used to be simple, normal maintenance. The place to start is by visiting the dealer to have them connect their scanner to unlock any computers and to program in any new functions.

If you're referring to fog lights, keep in mind a lot of us feel they're rude and obnoxious, and they blind oncoming traffic. If it were up to me, I'd make them illegal except for use in fog.

Holler back with what you find out at the dealer.
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Wednesday, June 26th, 2019 AT 6:16 PM
Tiny
PHILLYA85
  • MEMBER
  • 2 POSTS
Fixed! After looking around I found another post about the compass not working. It showed the IOD fuse being blown. I never checked this as the fuses were in a special looking harness. I thought they were spares locked in. This is located in the fuse box under the hood closed to the front of the truck.

I pulled them out and there is a 20 and 15 amp fuse. The 15 was blown. I replaced this, got in the truck and turned it on. Digital compass was now active, radio stayed on after the key was removed until the door was open, and! The keyless entry worked again. Glad I waited a little longer and kept looking on the internet for something. Dealership wanted 90 bucks to hook it up to their machine. If I paid 90 to get told about a fuse I would've needed counseling. I hope this info will help someone in the future.
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Wednesday, June 26th, 2019 AT 6:16 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Wonderful news. Are the lights you added working?

The fuses you're referring to are in yellow holders. Those are handles, and they're meant to be pulled out if the vehicle will be in storage for more than three weeks. That turns off the "ignition off draw" for the computer memories. Since they are expected to be removed at times, no reprogramming of any computer should be needed and they shouldn't lock up. Very happy it was a simple fix and you found it.
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Wednesday, June 26th, 2019 AT 6:16 PM
Tiny
DALLASSCOTT
  • MEMBER
  • 1 POST
  • 2002 JEEP GRAND CHEROKEE
  • 4.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 197,000 MILES
How do I bypass or eliminate the anti theft system in my 2002 Jeep Grand Cherokee? The ignition cylinder has been removed so I can start it with a screwdriver, because all of my keys (and fobs) were stolen. It will not stay started for more than about 2 seconds.
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Sunday, January 5th, 2020 AT 7:17 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

You cannot bypass the alarm system. I would do a hard reboot of the system which is easy. Just remove the negative battery cable and hold it to the positive battery cable terminal for 1 minute this will discharge the capacitors and reset the system.

Here is a guide to help you see what I am talking about.

https://www.2carpros.com/articles/how-to-reset-a-security-system

You need the RF chip in the original key and glue it to the new key which will work

Also lock and unlock the rear hatch I have seen that work as well.

Please let us know what happens.

Cheers, Ken
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Sunday, January 5th, 2020 AT 7:17 PM (Merged)
Tiny
ZACH MCGAHA
  • MEMBER
  • 1 POST
I got a anti theft key I stick in under the steering wheel Every Time before I start it, or it won't let the start crank the engine. Recently it's not been wanting to start, and I thought maybe the starter went bad, so I replaced it. And the battery and it seemed to have fixed my issue. But negative, got to work the next day and after a couple hours of driving and turning it off and on. It won't start again. I have the key plugged in, and when I turn my ignition key over to on, the brake light comes on, and check engine. Then check engine goes away but the brake light stays until it's started but it won't start, no click, nothing. I'm thinking it's this anti theft key Because the female side I have to plug it into is kinda cracked and the key is old as hell and withered. Is there a way to easily fix this? Or bypass it. And where can I buy a new one from? Please help me!
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Sunday, January 5th, 2020 AT 7:17 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Is the security light flashing? Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Sunday, January 5th, 2020 AT 7:17 PM (Merged)
Tiny
TSTRAYER
  • MEMBER
  • 1 POST
  • 2005 JEEP GRAND CHEROKEE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 131,000 MILES
Key FOB appears to be broken, changed battery and still doesnt work. Dont want to spend money on new key and would like to just disarm the alarm. How can I do this? 2005 Jeep Grand Cherokee
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
To disable the alarm without the key fob lift the hood and then lock the doors with one window open and disconnect the battery for 30 minutes. Then reconnect the battery and open the door using the key on the drivers side. This will disable the alarm system. Also you can use the key and unlock the rear hatch that will work as well.

Here is a guide that can help

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let us know what happens,

Cheers, Ken - (Use the vote option to write in what happens)
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
EMEY1217
  • MEMBER
  • 1 POST
  • 2004 JEEP GRAND CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
How do I disarm or reset the alarm system. The only thing that quiets it is to disconnect the battery terminals
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It depends if this is a factory or aftermarket system. Try locking and unlocking the truck from either the driver's door or the rear hatch using the key.
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
WHIDBEYLM
  • MEMBER
  • 2 POSTS
  • 2004 JEEP GRAND CHEROKEE
  • V8
  • AWD
  • AUTOMATIC
  • 98,000 MILES
Alarm problem with 2004 jeep, alarm goes off sometimes with I unlock the driver side door with a after market the key, I do not have the remote for the key less entry.
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
It sounds like you have a driver side door latch that is out which has a micro switch which disables the alarm. I would replace it and see what happens.

You can try to manually lock (now "unlocked doors") each door on your car (meaning: open each door, lock each with your fingers).

Then go to the drivers door and unlock it manually with the key, from outside

This supposedly will reset it

Good luck!

If it does not work, don't fret, someone else will be along to correct me!

The Medic
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
ERNESTO123
  • MEMBER
  • 26 POSTS
Your driver's side keyfog has a switch that is damaged and needs replacement. What is going on is this: when you enter the key and turn it, the keyfob switch does not act dissabling the alarm. Next, when you open the door, the door open swhitch (which is a different switch) lights the interior lights and the alarm module interprets this as an intrussion and triggers the alarm outloud. So, all you need to do is to locate the switch in the extreme of the door keyfob and replace it. In my jeep such keyfob comes sealed with the switch so both things need to be replaced.
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
WHIDBEYLM
  • MEMBER
  • 2 POSTS
I fix the alarm system, I had to buy a new key and remote. No more alarm going off. The remote controls everything.
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
PETER189
  • MEMBER
  • 1 POST
  • 2002 JEEP GRAND CHEROKEE
  • 100,000 MILES
Wrong key was put in red light with line through key comes on immobilizer wont let the car run shuts off after 3 seconds can the dealer reprogram it or do I need new parts I tried all the suggestions offered on internet none worked?
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Does it shut down when you use the correct key? We need to do a hard reboot of the system please follow this guide

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
TURBOJAY
  • MEMBER
  • 1 POST
Thanks for this guide worked great for me :) I love this site
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Sunday, January 5th, 2020 AT 7:20 PM (Merged)
Tiny
HGREE3
  • MEMBER
  • 6 POSTS
  • 2001 JEEP GRAND CHEROKEE
  • 250,000 MILES
Went and asked about the anti-theft and car starting problem, the man told me that if the theft light blinks it is a problem reading the key, and if it stays solid it is the computer. So far, the key light stays solid; is there anyway to fix the computer at home? Any suggestions on to what in the computer is going bad?
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Sunday, January 5th, 2020 AT 7:21 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try a reset or another key if you have one not a new key as it will need to be programmed. See our link.
https://www.2carpros.com/articles/how-to-reset-a-security-system
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Sunday, January 5th, 2020 AT 7:21 PM (Merged)

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