Complex control panels in toilets are a way of life in Japan, especially on the NEXCO tollways.
Watch this.
Translation
1: ? (
ookii, big) causes to a large flush for large size waste (??,
daiben, feces)
2: ? (
chiisai, small) causes a small flush for small size waste (??.
shonben or
shouben, urine).
3: Lowers the lid and closes the seat
4: Lowers the seat and raises the lid
5 Raises both the lid and the seat
6: Stops all operations
7: ???(
oshiri, Butt): Washing of the anus, regular
8: ???? (
yawaraka, tender): Washing of the anus, soft mode
9: ??: (
Bide, Bidet): Washing of the private parts.
10: ?? (
kansou, dry): Blow dryer for drying the private parts
11: ??? (?/?)(
Muubu, Move): Rotates the nozzle sideways back and forth
12: ????? (?/?) (
Massaji, Massage): Cyclic increase in the nozzle pressure for a masage of the anus. Button for On/Off
Credit to wikipedia.