both brake lights still out

2001 TOYOTA COROLLA
97,000 MILES • 4 CYL • FWD • AUTOMATIC
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STICKBALL
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All three rear lights were out.I checked all fuses are ok. I than found third light bulb burnt.I replaced bulb and it is working but both brake lights still out.All wiring seems to be ok. Whats the problem?
May 26, 2010 at 7:55 AM
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SQM
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Hello,

Since the third brake light is functional it means that the brake light switch is working.
So, the issue is likely a bad wiring.
The third brake light is on a different harness, so it works independently than the two main brake lights.
Good chance of a bad ground as both of them uses the same ground.

Here is a helpful guide of how to check wiring:

https://www.2carpros.com/articles/how-to-check-wiring

I have attached the wiring schematics below for your reference.

Please let me know of any questions.
Thank you.
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Oct 14, 2021 at 8:51 AM