pudding

Hi all,

I am replacing the secondary air pump in my 2010 glk350 4matic, and I am wondering where the relay is located. I've read that the relay should be replaced when fixing the air pump, but none of the fuse panels (or owners manual for that matter >.>) have any literature telling which relays control what. I'm wondering if anyone has access to a diagram or knows which relay should be replaced for the secondary air pump?

Thanks!