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Repair guides and support for the first generation Chevy S-10 (4WD model T-10) Blazer, a mid-size SUV based on the S-10 pickup truck. Closely related to the GMC Jimmy.

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Need help with my lights

My passenger headlight doesn't work on dim and the passenger tail light is stuck on bright

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Hi @debbieholliday,

What is the year model of the vehicle?

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Assuming you've tested the switch and tested the lights separately, and the wiring is okay (problem doesn't come & go when you move any part of the wiring loom around). Then it's likely a Body Control Module issue (common problem) on this one, and quite a few others too. The quickest way is to buy a change-over unit from a parts supplier (repaired, tested and under a good warranty - & cheap enough). I wouldn't recommend second-hand, as these are a common problem for years. If you want to repair your own, you'll need a de-solder station & soldering iron with adjustable temperature. Re-work any dry joints you can find (especially on connectors and relays) and clean out the PCB relays (difficult to get exact replacements for). Use a 5mm strip cut from thin card and pinch it gently between the relay contacts while drawing it through until you can't see a black carbon trace on the card any longer. I've personally fixed hundreds of these and many more like them. If you need help repairing, post photos of both sides of the BCM PCB.

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