Steering multifunction suddenly not working

[VidurangaB]

Hi, suddenly the steering multifunction buttons not working in my Toyota allion 260

Anyone knows what's the issue or how to diagnose

[Davy]

Check for a blown fuse first. If that's fine, take it to a good electrician. 

If you are up for it, you can do a continuity check by using a multimeter. This will tell you if the clockspring inside the steering column is faulty. To do this, you will have to remove the steering column trims near the pedals, locate the wire harness coming down from the steering, use the multimeter terminals on the common pin and each remaining pin while pressing each button momentarily on the steering wheel.

[VidurangaB]

Thanks Davy.. 

but only the left side buttons of the steering wheel not working.. right side buttons are perfectly working.. also suddenly yesterday car trunk stopped opening using smart key.. locking unlocking using smart key works fine and trunk opening using driver seat key & trunk button also working fine. I can’t understand what’s happening