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Old 05-28-2009, 10:06 AM   #109
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Quote:
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That's the normal behavior for the instrument panel lighting - Full bright with headlights off and dimmed, per the knob, with headlights on.
I'll figure out this Toyota eventually. Thanks again.
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Old 05-30-2009, 06:57 AM   #110
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I finally got it to work after cutting about half the waires off, I am using a different 12V source and the voltage divider, the TPMS unit is unplugged. Not pretty but does work. CTScottt mentioned there is a regulated 4V signal coming out of theTPMS uit, I couldn't find one on my 09 only a 6V.

Last edited by regal; 05-30-2009 at 07:59 AM.
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Old 05-30-2009, 07:31 AM   #111
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Quote:
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but now when I turn my headlights on the instrument panel goes dim, under daytime running lights the dash is illuminated, very odd and can't find anything in the owners manual.
Your Yaris has daytime running lights?
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Old 05-30-2009, 07:49 AM   #112
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Your Yaris has daytime running lights?
yes 09, found it was just the dimmer switch turned off, for some reason the dimmer switch dims the dash only when the headlihts are on.
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Old 05-30-2009, 01:45 PM   #113
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My '07 & 2 '09s have normal headlights that you have to turn on, no DRLs. (Thankfully!) Must be a state law thing.
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Old 07-07-2009, 06:31 PM   #114
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Sedans don't get the DRL options like the lifback. My old '07 had them as well as my new '09.

I did the switch today. I had to leave it dangleing because I don't think the quick connects (splicers) made a solid cut through the facotry wires. I'll get to it eventually lol.
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Old 07-07-2009, 08:18 PM   #115
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Sedans don't get the DRL options like the lifback. My old '07 had them as well as my new '09.

I did the switch today. I had to leave it dangleing because I don't think the quick connects (splicers) made a solid cut through the facotry wires. I'll get to it eventually lol.


Here's an even easier method that I figured out one day. I just haven't gotten around to writing up a DIY on it:

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Old 07-07-2009, 11:54 PM   #116
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So now we are back to three wires? I did the heat shrink and all with the 150ohms.
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Old 07-08-2009, 08:00 AM   #117
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So now we are back to three wires? I did the heat shrink and all with the 150ohms.
It's not cutting the VSS and ESS wires (like the original started with). In doing some reverse engineering of the TPWS, I realized that it has a regulated 5VDC output that powers the radio receiver module. Tapping the white wire in pin 5 gives us this regulated voltage, so the resistor voltage divider isn't necessary. Both methods work, but this one is a bit more simple.
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Old 07-28-2009, 11:01 AM   #118
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I just took off my rims, I will be doing this in a little to get the light off permanently.
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Old 07-28-2009, 11:29 AM   #119
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I found my 09 to have completely different colors, I used a DMM to find the right wires.
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Old 07-28-2009, 11:38 AM   #120
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I re read this thread and realize I am not even close to competent to do this lol.
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Old 07-28-2009, 11:45 AM   #121
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learn how to use a DMM they cost like $6 at harbor freight, use the resistors to split a 12V line to 5V and send to the indicator light.
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Old 07-28-2009, 11:51 AM   #122
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I re read this thread and realize I am not even close to competent to do this lol.
Just look at post #115 above. As long as your wire colors/positions match up, it is quite simple, especially if you do the non-switch version. Basically, you clip one wire and tap it to another.
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Old 08-19-2009, 10:06 PM   #123
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ehh I did the resistor thing anyway, so basically the resistors was just for a 5v dc?
Doesn't matter soldering is fun Anyways you da man CT
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Old 08-29-2009, 01:00 PM   #124
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i just completed this in 90 seconds with a pocket knife.

it'll take another 30 seconds when i have a piece of tape to finish.
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Old 09-22-2009, 02:15 PM   #125
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CT Scott:
Great thread. Using your scematic, I did the fix in 30 mintues.
Thanks!
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Old 09-23-2009, 01:12 PM   #126
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Hmm I bought a rim for my Yaris with a useable tire but no sender. What happens if the warning light goes off! Ok to put tape over it?
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