Close
Q:

The brake lights won't come on when I brake. I replaced the brake switch. on 1994 Toyota Celica

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
How can I diagnose the problem
(1) Answer
(3) Comments
You can diagnose it by having a wiring diagram of the circuit , and an understanding of how it works , and by then using that information along with a volt-ohmmeter to test for power , ground and continuity as needed.Or check the wire harness in trunk along the hinge for a broken wire.