Headlights: low beams no/high beams yes - Automotive Wiring and Electrical


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Headlights: low beams no/high beams yes

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Auto Repair Home>> Automotive Repair>> Automotive Wiring and Electrical

michaeldoleman
New User

Jan 3, 2020, 5:06 PM

Post #1 of 3 (785 views)

Headlights: low beams no/high beams yes	Sign In

Car is a 2013 Toyota Prius C

Problem is headlight low-beams and one taillight do not work.

Here's the history, as best I can recall:

1) passenger-side headlight stopped working.
2) I pulled the headlight bulb, to change it, thinking that was the problem. The bulb I got didn't fit so I re-installed the old one (it didn't appear to be out, after all).
3) Drove the car and noticed at dark that I had no headlights at all. Pulled over and discovered: one of the taillights also, now, out, but the highbeams worked okay. All other lights seemed fine -- blinkers, brake lights, emergency lights, running lights, etc.
4) Bought & installed two new bulbs just to eliminate that as a possibility. Same symptoms: high beams fine, no low beams.

No other electrical issues that I can discern -- car operates fine.

I gotta guess it's the relay or switch, but before I go buying parts I want to be sure.

Anyone?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 3, 2020, 6:02 PM

Post #2 of 3 (772 views)

Re: Headlights: low beams no/high beams yes	Sign In

This circuit is far more complicated than you are expecting. There are a number of different light systems with DRL, without DRL, with HID, without HID.

They are controlled by a combination of the Body Control Module and the Junction Box Module.

The one thing you can check yourself is there are separate fuses for each light and high and low beam.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

michaeldoleman
New User

Jan 3, 2020, 6:44 PM

Post #3 of 3 (763 views)

Re: Headlights: low beams no/high beams yes	Sign In

Thanks for that... The one thing I forgot to mention is that I checked all the fuses and they are all totally fine.

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