The ESL is mounted on top of the steering column guiding the instrument cluster and higher than the brake pedal. Install the circuit board and check the point out from the switches inside the unlocked point out. (TIP: It can help to depress the switches when inserting the circuit board.) https://mercedesm156c63camgears96985.oblogation.com/27829503/top-guidelines-of-mercedes-m156-c63-cam-gears