1. Turn Signal Switch: The turn signal switch, located on the steering column, could be damaged due to the impact. Check the switch for any visible damage or loose connections.
2. Wiring: The wiring harness that controls the turn signals might have been affected by the collision. Inspect the wiring for any cuts, breaks, or exposed wires near the damaged area.
3. Turn Signal Relay: The turn signal relay, usually located in the fuse box or under the dashboard, could be faulty. Replace the relay and check if the turn signals start working.
4. Combination Switch: Also known as the multi-function switch, the combination switch controls various functions including turn signals, headlights, and wipers. This switch could be damaged due to the impact.
5. Clock Spring: The clock spring is a coiled cable behind the steering wheel that allows the steering wheel to turn while maintaining electrical connections. In some cases, a damaged clock spring can affect turn signal functionality.
Since you already verified that it's not a fuse issue, checking and testing these components would be the next step in diagnosing the problem. If you're not comfortable with electrical work, it's recommended to have a qualified mechanic or auto electrician inspect the vehicle to accurately identify and fix the cause of the turn signal malfunction.