BMW E90 Automatic Headlight Sensitivity: LICHT_AUT_WERT Coding

On the E90, being able to set how early the automatic headlight sensor reacts requires LICHT_AUT_WERT_1, LICHT_AUT_WERT_2 and LICHT_AUT_WERT_3 in the KOMBI module to be aktiv together. The coding does not fix a sensitivity level; it opens an adjustment option in the instrument cluster. Does this coding set the sensitivity itself? No, not directly. Setting the three parameters to aktiv makes sensitivity options visible in the trip computer menu, and you then make the actual choice from that menu. The distinction matters, because if you expect the headlights to behave differently the moment you finish coding, you may decide nothing changed and revert for no reason. Module: KOMBI Parameters: LICHT_AUT_WERT_1, LICHT_AUT_WERT_2, LICHT_AUT_WERT_3 Value: all three aktiv Result: a sensitivity option appears in the trip computer Limitation: per the source note, valid only on cars without iDrive Risk: low, fully reversible Which cars and which years? Source lists mark this trio for the 2006, 2007, 2008, 2009 and 2011 model years. A note in the same list sets the important boundary: the method applies only to cars without iDrive. On cars with CCC iDrive the adjustment is made another way, and for CIC iDrive the list states no known method exists. • Marked for the 2006, 2007, 2008, 2009 and 2011 model years. • Per the source note, it works only on cars without iDrive. • For cars with CIC iDrive the source list records no known method at all. • Model-year coverage comes from community-compiled E90 coding lists; the binding source is your own car's FSW/PSW data. How do you code it? The work touches three lines in the KOMBI module and all three must be changed together. OBDThink is an independent BMW coding and diagnostics app and is not affiliated with BMW AG. Note your service information before writing; per the source list, cluster coding can reset trip computer records on some cars. • Photograph the service information and trip meters before you code anything. • Move the car out from under cover and switch the ignition on without starting the engine. • Connect with OBDThink and search the KOMBI module for the light setting lines. • Save a backup, then set the LICHT_AUT_WERT_1 and LICHT_AUT_WERT_2 lines to aktiv. • Set LICHT_AUT_WERT_3 to aktiv as well and write all three changes together. • Cycle the ignition, find the sensitivity option in the trip computer menu and pick a step. Watching the light sensor's live value in OBDThink shows whether the sensor is working at all, without waiting for the headlights to react. How do you revert it? Reverting means returning all three lines to nicht_aktiv. The menu option disappears and the automatic headlights continue at factory sensitivity. Restoring a pre-coding backup returns all three lines in one step. Module: KOMBI Lines to revert: LICHT_AUT_WERT_1, LICHT_AUT_WERT_2, LICHT_AUT_WERT_3 Revert value: all three nicht_aktiv Method: change all three values and write, or restore the backup Check: no sensitivity option should appear in the trip computer menu What should you weigh when choosing a level? Making the sensor less sensitive means the headlights come on later at dusk. Even if daytime running lights keep the car visible from the front, the tail lights are not lit, so visibility from behind drops. A more sensitive setting, on the other hand, can make the lights switch on and off repeatedly under bridges and on tree-lined roads. Automatic headlights do not remove your responsibility to switch them on by hand. In heavy rain and fog ambient brightness can stay high and the sensor may never trigger; in those conditions set the light switch manually. What if the option does not appear? First read the KOMBI data back and confirm all three lines really were written as aktiv. Second, check whether your car has iDrive, because per the source note the method produces nothing on iDrive cars. Third, the option may sit deeper in the menu structure, so cycle through the whole menu with the stalk button to the end.