M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
Thanked 1,967 Times in 1,651 Posts
Seems we have to do this again. I get this is a hard topic because it is confusing, the company puts out poor and incorrect information. I just thought that a topic that has caused so much anger and frustration in the past, might have lessons that stuck.
You have to identify you relay physically. If it is the standard relay then that is in the glove box(after a certain year), but if it is electronic (big black) it will be in the trunk.
The difference between the two devices is for OBDII compliance. There has been discussions and some evidence that standard relays might have gone in some US cars, but to the best of my knowledge no one here has ever found one.
Euro cars and others not using OBDII are different. There have been more than a few later model UK cars that did have a standard relay, then to make matters worse it was in the freaking trunk!
YOU MUST FIND YOURS IN CAR! Although on a NA car it seems super likely it will be electronic and in the trunk, it is said some were made the other way. These parts do not interchange because the DME has different programing for both.