Hey, I have 3 of these 5th Gen Celica's (that makes 6 headlights), and I have had to repair the wiring harness at the connector for 3 headlights already. Sometimes you don't see any problems, but with the headlights always opening & closing, it flexes the wiring at the headlight connector a lot, and copper with fatigue & break. The plastic case around the wire looks good, but the wire is broken.
Best bet is to buy a new headlight connector at an autoparts store, cut the old connector off with an extra inch or 2 of the harness, then solder in the new headlight connector wiring. It will work again.
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