Central Locking Issues

M

McTyke

Member
Bit of a saga but I'll try and be brief.
When I bought car seller said central locking was a bit intermittant. I still bought it and it never worked at all for me. Seller drove it quite rarely (weekend car) so I thought possibly key fob battery needs a bit of time in ignition. Still never worked.
I took key apart with view to replacing re-chargeable battery. Still didn't work (at this point did not know about pairing key to car) Tested old battery which was showing 3v so assumed it was ok and put it back in. Note - I never soldered the connections to the battery. Originally it was welded but assumed a good tight contact would suffice.
Recently removed GM5 module and sent away for repair. They confirmed it was faulty so got it back and installed it hoping all good. Not to be. Tried every combination of pairing - even took it to local indie who tried it. No joy.
So next step send key away (I only have one) and get it properly repaired. Then I realised that receiver for central locking is in the rear view mirror. One of the first things I replaced was the original aut-dimming mirror (the mirror glass was all clouded) and I replaced it with a used manual dipping mirror from a 1 series. I just unplugged old one and plugged replacement in to place and fitted.
So, I'll likely seend key away for repair to eliminate this as cause but could it be the fact I replaced mirror and receiver that is causing issues? And if so, is there a cheapish remedy?
Thanks for reading. :headbang:
 
Don't think it matters that the mirror is not auto-dipping, but it needs to be the right type. The mirror from a 1 series uses a different radio frequency. Check out the correct choice of part numbers for your VIN on realOEM and then search on ebay. That's where I got mine (after I also got a 1 series mirror! :headbang: )
tip - if auto-dipping, make sure the one you get is clear and not showing a tint all the time - that's a sign the dipping material is failing.
 
McTyke said:
So could I get a non-auto dipping one as long as it was from a Z4 of same age?
Click to expand...
I believe so - but check on realOEM for the part numbers. I think some overseas markets may be different, but as far as I know any UK mirror will work - but note you will need a specific version if you have auto wipers...
 
So got the auto dipping mirror which was from a UK Z4. It obviously came off a car with rain sensing wipers judging by large aperture which shows through screen but I can blank that off as mine does not have that feature. Fitted it last night and used the procedure to pair my key and voila, central locking working. All good - for a while. After around 2 hours alarm triggered. Hmm - so just locked with key. Drove to work this morning and locked it with key fob - all good. Approx 2 hrs later alarm triggers. Not had chance to check codes to see whats triggering it but any ideas ?
 
Up-date: Alarm never triggered all night so hopefully it was just the bonnet switch. Central locking now working great :D
 
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