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Key fob syncing procedure (8 replies)

nige_w
11 years ago
nige_w 11 years ago
nige_w
11 years ago
nige_w 11 years ago

This question might well be attached to the replacement fob query below but anyway - I have a resyncing problem with my Rover MPI (yr 2000) key fob.

It is the standard 2 button Rover fob. It has worked quite recently. The other day it wouldn't so I changed the battery (pressing buttons to discharge it first). I then tried to resync it by doing the handbook thing of pressing the lock button at least 4 times to resync.

Didn't work so then tried putting it into the ignition and turning it to 2nd position (electrics on) and trying the lock button. I tried numerous variations: repeatedly pressing it on and off, tried holding lock button for button for 5 secs, also tried same on unlock button.

Have tried just repeatedly pressing both buttons with fob not in ignition which I think I have had to do when have disconnected and reconnected battery. Nothing much is happening. I am now at the stage of randomly pressing things so does anyone have the definitive resync step-by-step procedure?

I have 2 new 2032 lithium batteries and tried both so don't think it is a battery problem (though I will buy some new ones anyway just to check I have not got a couple of duds).

Is there any obvious way I can tell if the replacement batteries I try are definitely working even though the fob isn't syncing or if I have a damaged key fob?

All advice gratefully received.

Addendum, just read my handbook suggesting battery needs to be Rover YWK or Panasonic CR2032. My replacements are other brands - maybe this is the problem or do you also use other brand batteries?

hawaiianblue
11 years ago
hawaiianblue 11 years ago

Other quality brands are fine, it's basically saying don't use generic cheap ones with an unknown lifespan.

Did you put the battery in the correct way up?

You can pop along to a garage and see if they have a key fob tester, these basically beep or flash when they pick up a radio signal, this just confirms the fob is transmitting. I doubt they'll charge you for it, it's a 2 sec job.

It's possible the buttons have failed, second hand fobs can be programmed to your car though, you can have upto 4 on one car. If yours is a 2000 then it will either have 3TXB fobs or 17TN (the two models are interchangble)

nige_w
11 years ago
nige_w 11 years ago

Hi & thanks, battery is correct way up. Fob has been fully working up to a day or two ago. Doesn't mean something (like the buttons) can't have failed though. First just want to make sure I have gone through all possible resyncing methods before looking at replacing the unit itself.

hawaiianblue
11 years ago
hawaiianblue 11 years ago

Yes, with keys out of the ignition press the unlock button about 8 times and it should sync up. If not then there is a fault with the keyfob or alarm receiver.

I take if you only have one key fob? If so take the opportunity to get a second one as a spare. If you lose it you'll need to get a specialist locksmith out to start the car, rather than just getting a mate to bring your spare keys.;)

hawaiianblue
11 years ago
hawaiianblue 11 years ago

You can just use a multimeter on the battery to test it's giving out 3v, i have had new batteries that were faulty before.

nige_w
11 years ago
nige_w 11 years ago

Advice appreciated. Just got some additional new batteries and tried them and no activity. I have also tried giving the battery housing a bit of a ‘press' in case something is not connecting properly, but I think it must be the fob unit itself.

I do have a spare key fob so not completely stuck but I guess need to get the other one fixed.

Thanks all!

AMS
11 years ago
AMS 11 years ago

As HB says above check the battery, but while you're doing that check the contacts at the sides of the battery holder, they very often crack. I simply solder them up. In many cases the fob will work fine until you change the battery and disturb the joints.

Unfortunately if that fails, again as HB says the alarm ecu is at fault.

nige_w
11 years ago
nige_w 11 years ago

Just to wrap this up, as nothing seemed to be working I thought it might be bust so resorted to sending the fob off to a place called [URL='http://www.remotekey.co.uk'%5Dwww.remotekey.co.uk%5B/URL%5D which was quite helpful - ex Longbridge chap I think. Confirmed it was actually giving a signal but I needed it resynced so got an auto locksmith to do that.

Would recommend the remote key guy. I had given him the opportunity to refurbish the key even though it didn't need it. I know basic honesty says you wouldn‘t take someones money if it doesn't call for it but probably a few places would.

Just to add a couple of things to my last comments as I have just needed to use the RemoteKey place again. The guy is ex-Lucas (not Longbridge) & has bags of experience with Mini/Rover/Land Rover & Ford keyfobs & is a real Mini fan. Could not possibly be more helpful - would recommend him highly if anyone has similar synching problems.

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