In
AllDataDIY,
BCM, connector C1, pin 63, grey, 5V
reference
BCM, connector C2, pin 57, grey,
windshield wiper
BCM, connector C2, pin 61, grey, cruise control
BCM, connector C3, pin A4 & A5, grey,
door lock
BCM, connector C3, pin A10, grey, interior lamp
BCM, connector C3, pin B12, grey, instrument panel lamp
BCM, connector C4, pin C2, grey, instrument panel lamp
BCM, connector C4, pin F2 & F3, grey, instrument panel lamp
I'm guessing it is the instrument panel lamps.