Check and replace
1. Normal operation of the breaker is accompanied by clicking sounds. If one of the turn signals does not work and clicking sounds are not heard, then the bulbs should be checked.
2. If both indicators do not work, the cause is a blown fuse (located in the passenger compartment fuse box), faulty breaker, switch or loose contacts. If the fuse is blown, check for a short circuit in the wiring, and only after this check install a new fuse.
3. To replace the breaker, remove it from its socket in the fuse box.
4. Make sure the new breaker is exactly the same as the one being replaced.
5. Installation is carried out in reverse order.
(The text is quoted from the source website: toyotaman.ru)