Vehicle: 2016 BMW M5 (F10), V8-4.4L, Turbo (S63T), Automatic Transmission
Problem: Left headlight inoperative but scan tool shows a Front right outer fan “message”. No DTCs.
Details: The vehicle came into the shop because the left headlight was not working. The MIL was not on. When the tech tried to pull diagnostic trouble codes from the headlight control module, there were none but he did retrieve a issue description – “Front right outer fan”.
This model BMW is equipped with a cooling fan designed to cool down headlamp igniter module and headlamp control module. If cooling fan does not work, the control module turns-off the headlamp to prevent damage to other components
Confirmed Repair: The tech removed the bumper and opened headlamp assembly to have a clear view of the headlamp cooling fan. He tried to activate it with scan tool but it was not working. Next, the tech swapped the left and right fans and tried to activate it with the scan tool. The fan operated normally. He replaced right headlamp cooling fan and problem was repaired.