As part of my ongoing (never ending) project of my W202 C43, I have decided to take the opportunity to refurb the headlamp wiper motors. One was working no problem but the other was seized solid. Opening both of them, they appeared to be in fine order, no signs of water ingress and plenty of white grease on everything. Came across this thread relating to the motors, albeit for a W124 HOW TO: Headlight Wiper / Washer System Diagnostics and Repair As well as this relating to a volvo headlamp wiper motor, which is exactly the same apart form the fixing bracket. How To Repair A Volvo Headlight Wiper Motor So following the instructions on the volvo thread I have managed to sort out the seized cog with a little sanding with a dremel. My success was short lived, as when I re assembled the motor and tested it....nada, nothing, diddly squat! When I disassemble it and test the motor with all cogs in place, everything spins freely. The small cog with a built in locator pin which is situated at the opposite end of the motor (pic 7 on the volvo thread) bottom right hand corner had been dislodged and now I have no idea what its purpose is or the correct way to re install it. Any ideas who can refurb these units or can anyone shed any light on what I need to do please.