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Discussion Starter #1
Hi Folks Im new to this Forum. Cant believe I didnt find this forum before. I have an MG ZR105 1.4 2005
Love my car. Recently I go to lock my car with the fob and the car wont lock. It opens ok but doesnt lock with the fob. The vehicle starts ok but sometimes it bleeps and wont start so I press the open button again on the fob and vehicle starts.
I can lock car manually.
I there a way I can reprogramme? Can this fault be fixed by any garage or a mobile service?
I have also noticed the button to lock the car on the dash doesnt work either. Used to press and doors lock unlock
 

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Discussion Starter #3
Hi would you know where the BCU is situated? Im guessing behind the glovebox?
Many thanks for your help
 

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'06 MG ZR +120 (HQM) '04 MG ZR 105 (IAB)
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The SCU is more behind the centre console, mounted on the bulkhead behind the air conditioning condenser housing. I would start by having a read of this thread: General - Pektron SCU/BCU (or the first few posts at any rate).

It will tell you about a few of the foibles of the Pektron SCU, and where to find it along with basic information on how to remove it. If your car has air conditioning fitted, it can be a bit of a pig to get access, and you might find this YouTube video helpful: sQeFa5v5DXM (you'll have to put that into the YouTube search box to find it as it seems the new crappy Xenforo forum software won't display links anymore!!!! It really is utter garbage).
 

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Discussion Starter #5
Hi no air con fitted. I did fear however that rain water was getting in somewhere and the problem has only happened during the endless rain fall.
 

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'06 MG ZR +120 (HQM) '04 MG ZR 105 (IAB)
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There have been instances where water has got into the bundle of wires where the main loom goes through from the engine bay to the passenger cabin, and this has worked its way down and run into the top of the SCU (which is situated with the connectors uppermost). However, it is my belief that this is more likely due to over zealous use of a pressure washer to clean the engine bay rather than due to normal rainfall or external washing.

Where water does get into the SCU, the first thing it comes into contact with and damages is the radio receiver circuit board for the fob signal, and so when this is damaged, the fob/plip buttons no longer function for either locking or unlocking.

In your case, I would almost 100% guarantee that it is the relay within the SCU that controls the central locking that has failed.
 

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Discussion Starter #7
Many thanks for your help. Im just hoping until I can get this sorted I can still drive. Car wont lock but will open only. Sometime when trying to start the car it bleeps then I click the open button again and it starts. Just the MG specialist is so far away. Mostly I leave the car unlocked or lock manually. I live on a farm and park in a private car park at work
 

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rover_sd1
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Anyone thought to advise to replace the Fob battery first before removing the the BCU. It is a sod to get to.
 

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'06 MG ZR +120 (HQM) '04 MG ZR 105 (IAB)
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He said in his first post that the car won't lock with the fob, but will unlock OK, so thought it reasonable to assume that the fob is working (ie. battery OK).

As it appears that sometimes the fob isn't being stimulated by the exciter ring around the ignition key barrel to transmit the disarm code for the immobiliser, it may be that the battery in the fob is becoming weak too, so probably worth renewing it anyway.

As he hasn't got air conditioning, getting the SCU out is fairly easy (albeit involving a fair amount of dismantling).
 

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Discussion Starter #10
Hi folks really strange. Now the lovely hot weather has come both my key fobs and central locking working ok. Must be i guess rain water had got into the electrics some where. Now dried out

Strange but true
 

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rover_25
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Hi folks really strange. Now the lovely hot weather has come both my key fobs and central locking working ok. Must be i guess rain water had got into the electrics some where. Now dried out

Strange but true

Or the solder in the key fob was dry and now thats its hot the solder has slightly melted and re made the connection
 
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