High Beams not working all of a sudden

Same problem here. Would love some help!

My normal headlights work fine but the high-beams don't. I've replaced the bulbs and checked the fuses. Both are good. 2013 Prius Two.

 

Possibly need a new dimmer switch? (the thing on the steering column that you click to toggle back and forth from bright to dim)

 

Mine have quit working as well. Suddenly and unexpected. The blue dash light still comes on when the switch is activated, but there is no response from the high beams. Trying to locate a main fuse but having trouble finding any info. Identifix keeps sending me in circles... Anyone have any ideas?

 

The Repair Manual (more info) has some suggestions in the entry for “Both left and right high beam headlights do not illuminate,” under Vehicle Exterior: Lighting (Ext): Lighting System: Problem Symptoms Table. The first is to check H-LP HI MAIN (20 A) fuse, shown in the Owner’s Manual (PDF) as item 22 in the diagram of the engine compartment fuse box on pages 465–467.

The Repair Manual also gives a step-by-step procedure for checking the high beam headlight circuit itself. (See the Electrical Wiring Diagram for the wire colors.) The right and left headlight assemblies have separate fuses and grounds, so the problem is more likely to be in the DRL or DIM relay, or in wiring or connectors. It could be the DIM output of the main body ECU, but this is less likely.

 

Yes, check the relay(s).

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