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Hi there, I've just brought a 2003 Corsa but the central locking has a issue, the car can only be unlocked manually, it will not unlock with the fob but the car does lock with the fob, I assume its going to be a wiring issue but I just wanted to see if anyone else has a idea where to start looking? Thanks!
 

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Could just be either a faulty micro switch on the board for the unlock or possibly hopefully more likely your plastic fob section is broken and not pressing the micro switch underneath ( this was my issue )
Try taking the board out of the fob and pressing the unlock micro switch directly with your finger tip if it works all you need is a new case from eBay ( my case was broken had the same issue so I temporarily cut the front of the plastic fob open with a Stanley knife exposing the micro switches underneath I just used it like that pressing the micro switches directly with my finger tip for 2 days till my £3 case turned up bought off eBay . just be careful if you cut it open don't forget it's not waterproof so be ultra careful not to expose it to rain etc )
Don't forget to watch a youtube video of how to open your case and DO NOT LOSE the little immobiliser chip wherever it is located in your fob .
If your microswitch or board is faulty there are plenty of ebayers who do a repair replacement online service if needed or indeed I recollect mention of Corsa forum member who specialises in this area in a list somewhere just search on forum or ask someone will know as long as you have your original board as you do they can even copy this onto another board
Good luck
 

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I would start by having the key fob tested to see if it is emitting a signal when the button is pressed. It may be as simple as a flat battery. Many motor factors will replace battery for free and test the fob.
 
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