Replaced Hid bulbs and high beams come on when lights turned on. No low beams…

Make sure that you understand how these lights work. On normal incandescent - halogen bulbs, the high and low beams use distinct separate filaments on a single bulb design (other cars have multiple bulbs). Either design is easy to see the difference from low to high.

The HID system on a Gen2 Prius is different. It only has a single bulb per side, and it is either on or off. "High or low" beam it not accomplished by changing the intensity of the light source. Instead the HID system uses a mechanical "eyebrow" shutter to block some of the light in low. Switch to high and the shutter raises to allow more light out.

Putting new bulbs in might have made your lights a bit brighter, and changed how noticeable the low/high shift is. If you see any change at the "top" of the beam, then the shutters should be working.

If not then I would indeed check the connections for dirt or bent pins.

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Just a thought, might not help - but I always switch these out with plug and play LED replacements (no wire splicing). Takes about 20 minutes (with practice of course more like an hour or two first time) to loosen bumper and take headlights off which makes the job go much smoother. I switch to LED because for $60 you don't need to worry about the ballast and so it's much cheaper than the HIDs.

 

HID bulbs either light up and work, or they don't.

Do you hear a slight "thump" from the lights when you switch low-high beam and back? Remember, when the headlights are ON, then the HID bulbs are ON - the same in low and high. Switching to high should supply power to the shutter solenoid. Switch back to low removes power from the solenoids.

ANY chance that the bulbs are not fully seated in the lens housings? If the bulb is out of position, all bets are off as to where the light ends up.

Do you have a copy of the service manual and wiring diagram for your car?

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I suspect the headlight switch stalk has gone bad. One item failure, causes both sides issue, vs both sides (2 item failure) simultaneously failing…


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