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I had the brake lights remain lit on my 2000 S10 pickup. I've heard that the relay could malfunction for the CHMSL (center high mount stop lamp). simple swap to check.
In my case I found that in the fuse relay center located under the hood on the driver side; that there was a green 30 amp mini blade fuse in the HVAC location. When removed; my brake lights no longer remain lit and the horn no longer honks for no reason. The only function I lost was the blower motor position 4. I'm guessing that the blower motor relay might be the cause unless its just wiring. I intend to test the blower motor for resistance too just to check.
I know for a fact it wasnt the brake pedal switch because it fucntioned fine. It just sporadically would remain lit sometimes. The horn would honk on its own until it was put in any gear. It's very possible the short is in the fuse relay unit itself. Removing the HVAC fuse works for a quick fix. I still have heat and A/C except blower speed 4.
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∙ 13y ago
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