Mercedes ML with a High Beam lighting fault. The module under the engine bay was giving a NEG output to the high beam relay at all times. The indicator stalk which has the lighting switch in was working fine and as such there was a fault within the Multi Funtion control unit. These can be very expensive on Mercedes vehicles to replace. As such the customer wanted the quickest / best method to get the vehicle through the MOT which was due the next day.
We found the relay which is […]