BMW E90 inner xenons do not light on high beam
Why do the E90's inner xenons not light on high beam?
From the factory the inner lights work as cornering lights and illuminate the inside of the bend. In some cars they work as high beams only when flashed. This is not a fault but the normal operation of the light set.
How do you make the inner lights light on high beam too?
A coding change is made in the light control unit. The parameter FL_AUS_BEI_BIX_IN_S_FLC is set to nicht_aktiv and the PWM_FL_BEI_BIXENON value is changed, after which the inner lights light brightly. The coding is done by a BMW-competent workshop.
Which bulbs are in the E9x factory light sets?
The basic lights have H7 in both low and high beam. The bi-xenon lights have D1S xenon in low and high beam and H7 as an additional high beam. In the bi-xenon cornering lights the H7 additional high beam only lights when flashed, and it can be coded to light with the high beams as well.