Strange Central Locking Woes

[kernowjoe 2 1 Cars]

got a weird issue, central locking rarely works on the key(to be expected, its french) but when cranking the engine it seems to go all by itself?!

 

I noticed when bleeding air out the system the central locking started going off, any ideas where to look, car is m reg td

[Andrwn8304 0]

I had a similar issue a few years back after 6 weeks of trying to work it I got a Electric Central Locking from ebay about £35 back then changed all the motors and never had a problem since.