bosch SGV53E03GB motor wiring

hello i recently sold a S/H motor to a customer for above d/w he’s fitted it and now says it runs for about 20secs then stops! if he opens the door and closes it it will start up again but only for about 20secs when it stops he thinks its trying to go? because he can hear a buzzing but is’nt sure ?I think He may have the wires round the wrong way round? does anybody have a wiring diagram for this machine? his wires are pink, purple and white. Has anybody come across a similar fault.? Please Help ….