What can a cosigner do when the car was involved in an accident and he was not the driver?

I've seen enough 'Judge Judy' episodes to almost recite her exactly... Anyone who cosigns for something - is equally liable for any costs. Although they were not responsible for the actual accident - the other party can sue each cosigner for the cost of repairing the damages.

The cosigner who was not driving - would then have to sue the driver to recover their money.