Windscreen wiper problem

[Louimfc]

Hello, the other day I was driving in heavy rain and my wipers stopped in the middle of my windscreen. My rear wiper works fine also my stalk must be fine because my washer jets work fine also it works the rear wiper. I have checked earth continuity from the motor connector to a bolt in the engine bay. I have also checked power to the motor and I have no power on settings 1 and 2 but on setting 3 I have 13 volts for about 2-3 seconds then nothing after that. Is this a relay issue if so which one is it most likely to be, I don't think it's the stalk because my jets and rear wiper works fine from it? Help would be appreciated. Thank you, loui