Is there a fix for the LED headlight" chi headlight system" error????

Wow, did you tell your buddy that people spend bucks doing the opposite? That is going from halogen or HID to LED?

SCH-I535

 

You would probably have to take a look at the schematic for the headlight circuit for the LED system to figure it out.

SCH-I535

 

Going from NEW technology to OLD? Doesn't makes sense. When the error light, he should rethink his strategy.

 

What you have to do is check the draw for the on the LED headlight and compare it to the Halogen headlight. you are going to have to add some resistor to it to trick the system in to think that it is still using the LED headlight.

 

LEDs draw very little current, if any. Your best bet is to use a relay to run the HIDs. Since a relay is designed kind of like a current amplifier I think that would be the best shot at removing the error light.

SCH-R530M ?

 

My guess would be that the mystery wire is for the headlight leveling system, and it expects the motor to be there. Maybe it's possible to remove the Headlight Leveling ECU, which appears to be what triggers the message, without any adverse effects?

 

Since you're going to disassemble the harness anyways: remove/disable the pin of concern and check function...

SCH-R530M ?

 

0.6 V is very little. What's the voltage when the headlights are off?

Standard TIS is $15 for two days. Not too bad....

Otherwise I'd say try to use an oscilloscope to see. The little green DRL relay outputs a square wave to the DRLs....

(Didn't realize I've jumped from my usual Prius v section. Does his model have DRLs?...)

Now that I think about it where's the high beam signal?

 

I'm no EE, but perhaps you can use something like this buck converter:

http://pages.ebay.com/link/?nav=item.view&id=300863938609

It's a bare board, so you'll need to put it in an enclosure/project box for sure. Also, the minimum output voltage isn't 0.6v, so you might need to put a resistor on the output to get the 0.8v down to 0.6v

Hopefully, an EE or knowledgeable electronics hobbyist will chime in.

SCH-I535

 

I had another thought. There is a very small wire behind the dashboard, on the driver's side that is hot when the parking/headlights are on. It is the same brown wire mentioned in the oem foglight installation instructions.

This wire is very thin gauge, probably 24 gauge, so it carries low current. Don't know what the voltage is though, perhaps you could measure it? If it is usable, tap into it and run a wire out to the engine compartment to provide the signal you need to prevent the error light.

SCH-I535

 

sfv, are you doing the swap for your "buddy", or are you the "older fellow stuck in your ways"? LOL I can't imagine the benefits of HID over LED's unless you're going for more light output.

 

EE, I'm not, but CECS student, or more specifically EECS student, I was, and I can tell you my EE101/EE102 project had a whole lot more wires than this. I've been waiting for a practicing EE to chime in, but I guess I'm the best you got right now. xl knows his stuff, maybe/probably even more than I....

I see the CTS in the background. If you pop the hood I'll be able to tell whether that's a real V or not. My parents' have a '10, which didn't come with a Rear View Camera. Maybe I should be asking you for help!!! I'm not good at soldering, otherwise I'd probably take on more. It's funny though, the repair wiring info/part numbers from Toyota has/have information on crimp connectors, which I've had experience using before, sometimes bad experience. (Sorry, no current TIS subscription, just from past searching...)

Yes, the LED system in the v doesn't seem to be as bright as my experience with HIDs, at least OEM HIDs.

You sure 0.6V DC is the signal you want to produce? Resistors in series can probably get you down to 0.6V if that's what you really want. xl found a very interesting DC-DC converter. To my less experienced eye it's just plain resistors in series/voltage divider.... Probably best to check TIS info to be sure what you are looking at. For example, I was researching Prius v DRLs. I found the wiring diagram, but couldn't figure out what exactly was going on. I researched the diagnostic/repair info. If you look at different models with DRLs, you will find different diagnostic procedures! I believe, (from memory,) that the Prius c and possibly Sienna use the same DRL relay, and checked their info as well. One of those explained the square wave output of the DRL relay. I got a Prius c fuse box from a salvage yard, but have not yet taken it apart to get the relay block wiring for the DRL relay, been busy. (I could not find the part numbers/repair info on the DRL relay block, just the part number for the relay block itself. Without this info, you have to salvage a used relay block harness, something I don't consider an OEM solution, but I did it anyways....)

 

Yes, where are the EE guys when you need one.

Square waves, that sounds like the signal is regulated by Pulse Width Modulation (PWM) from an ECU.