Have sorted this myself now guys. Went to renault and was told they would look at it for £72 then there would be the cost of the repair. No chance. I narrowed the fault down to the actual sensor within the licking mechanism and there is no way to access it as the lock is a sealed unit. So I attacked the wiring loom and after several experiments found that by shorting out the grey/red wire with the thin black wire, you act as if the sensor has been operated. Put it all back together and hey-presto the central locking now works again. Probably saved myself a few hundred quid in the process.
Dave
April 2014
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