Some of the relays are the same under the fuse box. The one i'm talking about is distinct from the other ones, its a little black box. So you won't have another one to move and plug and play with.

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My Cars
Mercedes CLS
Mercedes C-Class W203 - All time favorite

R.I.P.
Mercedes C-Class - W202 Lemon
Mercedes ML - Warrior
VW Jetta – Worst Car I ever owned - Alot of problems