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2004 mg zr had to disconnect battery also replace the key fob case. When i reconnected the battery the alarm went off. Fob won't turn it off Can i use the key only to turn alarm and immobiliser off

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  • MG Master
  • 3,442 Answers

Try disconnecting the battery and leaving it overnight. Unlock the car, insert the ignition key and switch on - then reconnect the battery.

That sometimes works. If it doesn't you will need some experienced advice and specialist help. Rover/MG usually needed to be opened by whatever locked the car to avoid the alarm sounding. If the key was used to lock it, then using the key to unlock should be ok though I seem to remember the alarm will sound after a short time if the key isn't put into the ignition and switched on fairly quickly.

Posted on Aug 11, 2017

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: key fob will not undo

If you don't have one that works for the vehicle now, you'll have to take it to your local dealer to have it programmed to the vehicle. Some will charge for this, some will do it at no charge.

If you do have a remote that is programmed and working for the vehicle, then the following steps will allow you to program another remote:

1. Enter vehicle and close all doors.

2. Put seatbelt on (or clip it into the buckle) to shut the warning buzzer off.

3. Put key in ignition, turn to run position but don't start it.

4. Press and hold the unlock button on the working key fob and hold for 4 seconds, then also press the panic button.

5. Release both buttons and you should hear a single chime to indicate it is in program mode. You have 30 seconds after the chime to program any additional remotes you want to program.

6. Press and release both the unlock and lock buttons simultaneously on the remote you are programming. You should hear another single chime.

7. Within 4 seconds after hearing the chime, press either lock or unlock button on remote that you are programming.

Posted on Oct 16, 2008

  • 1 Answer

SOURCE: renault megane key fob wont work

I had the same problem with mine

your key fob is now out of sync with the ECU to sync them just follow this link (renault will charge up to £180 for new key and to sync it)

http://renaulthelp.110mb.com/ImmBypass.html

Posted on Jan 09, 2009

  • 89 Answers

SOURCE: Immobiliser problem - 94' Golf Mk3 GTI 2lt 8 valve

just unplug the immobiliser unit. its behind the glove compartment for rhd models.

Posted on Mar 18, 2009

BRADLEYFRANC
  • 104 Answers

SOURCE: imobiliser problem

If im not mistaken,your car should have an alarm reset/override.Below the steering column,on the dash should be a slot where you put your remote transmitter to deactivate the alarm.If that works,you then need to have your remote checked and coded by a vw dealer.Good luck.

Posted on Aug 14, 2009

roniecon
  • 6826 Answers

SOURCE: how do you re-link the key fob to the car after

Try this,,turn the key on ,wait 10 minutes,then turn the key off,then right back on,do this three times,a total of 30 minutes,this should reset the key fob,if this is the problem.

Posted on Apr 17, 2010

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My key fob for my mg zr is nackerd. Still works just the buttons have come off. How much and what mg dealers will supply a new one programmed for me ?


If it still works it shouldn't need replacing but fitting to a new case.

The last time I wanted one the cost from a dealer was stupidly expensive - really a rip-off.

I noticed the fob of an old Nissan Primera was the same and enquired at Nissan. They sold me a new case for just a couple of pounds.

This was quite a time ago but it could be still worth asking.

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Disconnect the negative cable first and then the positive cable and remove the battery. The lights/alarm will go out when battery is disconnected and may come back on when reconnected. Use door lock key fob to shut alarm/lights off if they come back on when battery is reconnected

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Aftermarket alarm system?? If so it could be anything with that alarm. If it's the factory security system, this is totally normal. When you disconnect the battery and reconnect it, the system resets and automatically "panics" because it saw the power failure. If it's the factory system, simply have the key fob handy to turn it off after you connect the battery. If you don't have a remote fob, just put the key in the driver's door and unlock it. This will override and shut off the system.

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Try not using the fob at all open the door with the key. And start the jeep if it works without issue then its the fob. If its still not working correctly remove the battery from the fob and try again(since if it was damaged could be sending the signal for the panic button) the next step is the key try your spare security key can become worn and cause issues with the antitheft system. After that it only leaves computer problems and those can get spendy

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1 Answer

1999 Montero, changed battery, alarm going off. No key fob. How do you stop the alarm


1) Disconnect Negative Battery Terminal

2) Turn Ignition Key On

3) Connect Negative Battery Terminal

4) Alarm will be deactivated. You should get a fob for this vehicle to prevent any accidental alarms going off in the future.

CAUTION: This procedure will create a spark when reconnecting the battery. A recently charged or discharged battery can be surrounded by a cloud of explosive hydrogen gas. Wear safety glasses and turn face away from battery while making connection. Do not perform this procedure with a battery that has recently been on a charger!

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Replaced starter on '99 Yukon. When reconnected


I can't say for sure but it sound like you either trigger the "Panic" button or alarm system if equiped. Hook the battery up (negative last) and push the "Panic" button on the key FOB.
If you don't have the FOB you may be able to reset but disconnecting the negative cable only.
If it's an alarm system, locking and then unlocking with the FOB should reset it, also using the key to turn on the ignition is supposed to reset it.

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Yes!... reset the alarm with the fob!

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My key fob wont lock or unlock and set the alarm anymore. I put a new battery in and everything!! HELP!


Sounds like you lost program, or a bad key fob. Either way, check with the Honda dealer.

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Won't start after cleaning battery terminals


Sounds like you have an aftermarket alarm with starter disable. By disconnecting the battery the alarm reset and the defualt setting is usually to set the alarm automatically (active arming). You have three options..
A. If you have the key fob that went with the alarm you can disarm the alarm.
B. If no key fob is available you can disconnect the battery again, turn the ignition key to the on position and reconnect the battery. This usually doesn't allow the alarm to set and allows the car to start.
C. Remove the aftermarket alarm system. This is usually the long term fix i recommend if the fob isn't available. Option B should get you going though.

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