Turn signal auto-shutoff not working

[spookybathtub]

I took my steering wheel off to replace a broken spiral cable. I haven't found a replacement cable yet, but I put the wheel back together to drive it in the meantime. Now my turn signals won't shut off automatically after making a turn; I have to shut them off manually. Is this feature somehow dependent on having a spiral cable in place, or did I break something?

[CTScott]

It is dependent on the spiral cable being present.

[spookybathtub]

How interesting. You're right, it's fixed after replacing the spiral cable. How does that work? There aren't wires for it in the spiral cable, so I thought it had to be mechanical.

[dj92]

I don't know the Yaris' mechanism, but mercedes used a small plastic pin in the 80's that flipped out and was pushed aside by a tooth in the steering mechanism.
Maybe the spiral cable assembly provides this tooth?

[CTScott]

^Exactly - It is just a simple plastic tab that knocks the turn signal lever back.

[colblu44]

I have never removed anything from my steering column, but now my right turn signal won't self cancel. Can I fix this myself? Should I replace the whole unit? Any instructions posted anywhere?