CruzMS

I have a 2010 RX with the steerable low beam headlights. When I switch to high beams, these flick up slightly to project light further down the road, however the high beam lamps do not come on. I've replaced the high beam bulbs on both sides and checked the fuses (engine compartment block, going by labels on the fuse box lid). No blown fuses, and still no high beams.

Soooo.... either I'm an idiot who doesn't understand how this system actually works, or there's an electrical problem. Any thoughts? Anyone got a schematic they can post?

Clutchless

I recall they are automatic and will not stay on unless the sensor thinks it is dark enough for high beams. That is probably the issue. Go someplace extremely dark out in the country and test your high beams. Also are your headlights set to automatic with daytime running lights or did you turn them on manually by rotating the switch on the stalk? That may make a difference.
My other thought is the switch/stalk may be bad, but think that unlikely.

CruzMS

Thanks for the reply. I took the RX out this morning pre-dawn to an extremely dark spot and the high beams would not come on. I've tried both the Auto and regular headlight positions on the stalk. Since the stalk toggles the hi/lo on the projectors, I'm thinking it's probably okay. At this point I'm wondering if there's a relay or harness connector (oxidation) problem. Let's see if anyone else chimes in.

Clutchless

It may be the high beam sensor.

CruzMS

Do you know where that is located? Is it pretty much a light sensor that interrupts the high beams if there's oncoming traffic?

Clutchless

Yes that is it but I do not know where it is located.

mcomer

There should be a roughly "3 cube hanging down between the inside rear view
mirror and the windshield. It has a sensor facing forward, be certain it has an
unobstructed view to the front. I have solved numerous High Beam inoperative
conditions by merely removing a tollway or security gate transponder from that
area. One was actually rubber banded rather neatly to the entire unit!

CruzMS

The only thing non-OEM in that region is a V1 hanging under the rear view mirror. I'll investigate any opportunity for sensor view obstruction. I'm wondering now if maybe the wiring for that sensor got molested when I installed the V1. I'll report back with findings (it'll be next weekend, but I won't forget - forums like this are awesome and I'm always ready to contribute).

Droid13

I was under the assumption that all the 2010's with the movable headlights all used the HID lights (as with mine). If I'm wrong, sorry for the tangent but this is how it works for me. The larger outside DRL lights are not steerable. The inside, smaller HID lights move in both high and low beam settings. The lights don't actually change in intensity from high to low beam. In low, they simply have a little cover that shields the top 30% of light from projecting too high into oncoming driver eyes. In high beam, the cover flips out of the way.

In auto setting on stalk, there is a camera type sensor built into the back of the rear view mirror that looks forward (kind of looks like a dash cam) and decides when high beams should be on when the stalk is pushed to the outward position (permitting high beams if the system thinks its called for). It is also tied into the daylight sensor in the center of the dash near the glass to decide if the headlights should be on at all. Pulling the stalk all the way inward should flash the high beams, but won't keep them on.

With the stalk set to regular headlights, the headlights should be on high whenever the stalk is all the way pushed out, or hold all the way in as most cars do.

Clutchless

In the USA if you have HID headlights with movable headlights they have a D4S low beam bulb. The high beam is a separate 9005 bulb. Now maybe it is different in Toronto, Canada.

https://www.hidconcept.com/pages/pro...w/%20HID%20H/L

RadiantX45

What country are you in? In North America the "flick up" you are experiencing is the high beams. No other lights come on, the beam just adjusts itself into a higher position when the high beams are activated in any mode.

In other countries like Russia, the DRLs also double as the highbeams. But in North America that is not the case. So if you're seeing the "flick up" that's all you're going to get.

N4TECguy

This is incorrect. The HID bulb is both the low and high, when you flip on the high beams a shutter moves out of the way to allow light to travel further down the road. The 9005 bulb is a DRL and daytime "flash to pass" high beam in certain countries. But all HID AFS models use the D4S/shutter for low/high as far as I know.

mcomer

The Auto High Beam only activates when the car is over 10 to 15 MPH. The whole point of high beams
is to not outdrive the beams, don't need high beams at 7 MPH, right?