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

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How can I diagnose the problem
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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.
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