What changes
Unit 09, object 50C4 (interior light general settings): byte 13, bit 5 = 1. The interior light comes on when the boot is opened.
Details
Parameter Interior_light_activation_by_opening_trunk of object 50C4: the group and the meaning are confirmed by open guides for unit 09 of this generation; the bit number comes from a single source so far, so check the preview. The light goes out as usual — when the boot is closed or after a timeout. a3c first checks that the long coding of 09 is empty, as on the new unit. Unit 09 on MQB Evo is SFD-protected — you need a token for unit 09. To turn it off, set the same bit to 0.