Majd

Hi I have 2001 Lexus ls430 and I have a b1266 instrument panel short bus B+ code, instrument panel not working fuel gauge don’t work accurate I have full gas it shows it’s empty with yellow light on, temperature light is wrong always cold, A/c don’t work, help me please, airbag light on abs light on the car drives smooth just a short circuit somewhere and I can’t find it how do I find the location for the short