Hello: I share your frustration. I installed a bi-xenon kit for the H4 Sequoia headlights and a 9006 HID fog light kit and experienced the exact same thing. After countless hours of research I found a pretty clever fix that works for me. It may not be your solution, but I will tell you what I did. I am not recommending you try this, I'm simply stating what I did.
First I'll tell you why your sequoia is doing this before getting into what I did. Like the other reply said, you can get your HID lights to turn off if you have the light switch dialed OFF and push the lever out for Hi Beams.
With the Bi xenon kit, you are now powering the lights directly from the Battery via the HID balast, not the toyota light wiring harness... Thus the toyota computer does not register a Load when the lights are turned on. With the HID kit installed, the toyota light wiring now merely signals the balast to turn on or off and change from hi and low beam, and no longer are they powering 55 watt halogen bulbs... so your vehicle computer doesn't know your lights are on or off for that matter.
This is why your fogights will never light now as the vehicle does not sense that the low beams are on... There is no current draw. Thus you have no power being sent to your fogs lights even though your HID lights are on.
If this makes sense to you up to this point your doing well.
One test you can do to verify this is simply unplug one of the vehicle headlight leads from one of the HID lighting harness leads and plug in one of your factory halogen bulbs. Make sure it is not touching anything that could melt as it will turn on / off and high and low as usual.
Bingo. You car is back to normal. Now your HID lights turn off, your low beams and fogs turn on as they should and your high beam indicator light works. I know you can't drive a vehicle like this but it proves my point that the computer system MUST sense a current draw to operate normally.
The FIX!!!!!! This is what I did. I am not telling you to do this. What you do in 100% your decision. I am not responsible for any damage that you may do to your vehicle from the following description of what I did with my Sequioa. So proceed at your own risk.
I simply installed a 20 watt 8 ohm resistor (purchased at Radio Shack for $2.29 Part number 2710120) inline on the passenger side OEM H4 headlight wire, before it plugs into the HID wiring lead. I chose the passenger headlight as you have way more room on that side to work. The resistor is only a couple inches long with 1 1/2" wire leads on both ends. I wired one end of the resistor to the middle or neutral plug, and the other end of the resistor to the low beam plug. So now when the headlights are turned on in low beam mode, the vehicle senses a 20 watt draw and bingo... the fog lights now turn on when my lights are turned on and in the low beam mode. The fogs turn off as they should when the high beams are turned on.
I did NOT have to wire a switch directly to the fog lamps and relays etc... Now my fogs turn on / off exactly like they should using the dial on the head lamp switch and in Low beam mode.
Two Issues.... The lights still only turn off when in High beam mode... and when the lights are on and I toggle between hi/low beam, their is no blue indicator for high beams. I am pretty sure I can fix this as well, by adding another 20 watt resistor to the other headlight Hi beam... so the vehicle senses a high beam draw and will turn on the blue indicator. I have not done this yet but will be trying it at my own risk soon.
The way it is now... I can use my HID's as daytime running lights by turning them on when the light switch is OFF and the HI beam / Low selector is in the Low mode... In this mode, only my HID headlights are on, and my dash lights, trip computer and radio lights do not dim like when the lights are turned on during the day. Now I can be safely seen with my bright HID's in my gray Sequioa on dull or overcast days. I do have to remember to turn them off by putting high beams back on, but I really like using them this way.
I have the 9006 HID fog lights installed and they work pefectly when the lights are officially turned on and my HID's are on low beam. My Sequoia looks super cooooooool with all 4 lights lit up in HID 9000 blue. I've ran this way for a year now and no problems what so ever. You just have to remember to push the high beam lever out every time you exit the vehicle to the lights turn off.
The installed resistor never even gets hot! Even after 5-6 hour road trips. I've been through a winter and a summer, rain or snow and no problems.
The HID kits using the H4 bi-xenon kits will eventually have a resistor built in and a proper current ground to simulate the current draw of the factory halogen bulbs. But until then, this fix works for me now. Eventually, I will wire another resistor to the high beam side and hope that I get my blue hi beam indicator light back when High beams are selected.
When testing which two of the three H4 leads to wire the resistor to, I unplugged one of the oem H4 light connectors from the HID ballast. I then turned the low beam lights on and the fog light switch to ON. Then I stuck one end of the resistor into the H4 middle plug and the other end of the resistor into one of the side plugs that is the low beam light. When you get the correct sequence... bingo, your fog lights will come on. Then wire or soder the resistor onto the H4 plug or wiring, and replug the HID connector into your oem h4 connector. Now both HID's will light, your low beam with fogs will work, your hi beams with fog light cutoff will work... but your hi beam indicator will not light and the lights only turn off in lights off - high beam mode.
As for power savings... the HID's are only 35 watts each... x 4 = 140 watts. Plus 20 watts for my resistor... totals 160 watts. That is low compared to 4 lights at 55 watts = 220 watts that the Halogens drew. Even with a 2nd resistor wired into the high side, I will only be drawing 180 watts.
Good Luck and email me with any questions...
wirth315@aol.com
I cannot be responsible in any way for damage done to your vehicle by doing what I did. I am simply telling you what worked for me, and it is intirely your decision what you do with your vehicle.
I have a few pics, but cannot load them as they are above the 200kb file size.