Headlight woes. - Toyota Yaris Forums

B.B._07 · 09-20-2018, 11:17 PM

The Yaris has the headlights on a ground side switched set, what that means is the black wire at the passenger side headlight should have +12V at all times. Test the black wire with one lead on the black wire and the other lead on the a good ground or the negative battery terminal. If you don't have at least 12V then swap the two headlight fuses around (the fuses can be partially blown which is hard to spot just by looking). If you're still getting less then 12V then you know it's a wiring problem between the fuse box and the headlight, if the dimness issue moved to the other headlight you know it's the fuses. The blue wire is the low beam ground, green wire is the high beam ground. If you have a solid 12V at the black wire and the pass. side headlight is still dim you know it's a ground issue.

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09-20-2018, 11:17 PM	#1
B.B._07 Drives: 07 5dr Join Date: Nov 2015 Location: YYC Posts: 197	The Yaris has the headlights on a ground side switched set, what that means is the black wire at the passenger side headlight should have +12V at all times. Test the black wire with one lead on the black wire and the other lead on the a good ground or the negative battery terminal. If you don't have at least 12V then swap the two headlight fuses around (the fuses can be partially blown which is hard to spot just by looking). If you're still getting less then 12V then you know it's a wiring problem between the fuse box and the headlight, if the dimness issue moved to the other headlight you know it's the fuses. The blue wire is the low beam ground, green wire is the high beam ground. If you have a solid 12V at the black wire and the pass. side headlight is still dim you know it's a ground issue.