I fitted aftermarket central locking and the car worked fine but now the system only unlocks . the motors are 5 wire if that helps but any electical minded comments would help.
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Check that the lock wire has become detached or there is a dry solder joint. Does the central locking just work on the drivers door or other doors if so it could just be the one lock.
I fitted a remote which is brilliant to my after market central locking I got it from maplin.
If there is no luck with the above get a multimeter and test individual wires.
However the worst case is that the electronic control unit is malfunctioning.
Tom
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