Dip beam on active headlights. If it’s not the bulb nor fuse what’s the likely issue?

Thanks __
2018 L405 3.0 TDV6 Vogue SE Fuji White
2000 4.6 V8 HSE Oxford Blue
1994 3.9 V8 Vogue Ardennes Green - resto project

Land Rover History:
2010 3.6 TDV8 Autobiography Stornoway Grey
2001 Discovery 2 TD5 GS
1999 Discovery 2 V8i XS
1994 Discovery 300Tdi
1993 Discovery 200Tdi
1989 Range Rover Vogue SE 3.5EFi
1976 Series 3 2.25
1977 Range Rover 2 door 3.5 Carb