dubidoobs
Veteran Member
Did this a few months ago. Followed a few posts but the same process (Trigger wire from headlight switch pin 7 to cecm A17 (black connector). Move wire from A28 to C47. Move wire that was C47 to A28 to maintain DRL. Change byte 18, module 9, from 00 to 02). Works fine (pic below), but what change is prior to the swap/coding, top lamp was for brakes, middle was a park. After coding, all four lamps lit, top still lights up as a brake light, and when you open the hatch, the middle turns off. Tht's not really my concern (I actually like that), but what I always thought is that I can run the rear fog with the park lights only - my rear fog doesn't turn on unless I turn on the headlights (like I am able to with my old W123 Benz).
Is this how it works?
Is this how it works?