I keep hearing about how the 2007 HVAC pod is different than the 05/06. What did they change?

Will it also require a circuit redesign for LED swaps or will it be ok with 3.2v of forward voltage?

Man, would I love to get my grubby mits on one of them

 

Only thing different I noticed was.. where the passenger seatbelt light blinker is... they now have an Airbag ON/OFF there too..

 

Well, Desertheat IM'd me the other day stating it was "very different"... It has me very curious.

 

Any new info on this?

 

Just did one....

The LED layout is the same, though they add a few extras for the Passenger Side airbag.

So the bottom line is:

Traces still get cut in the same place physically.

Resistor locations are not at their old locations. However if you follow the traces to where they are now, you'll notice the resistor VALUES are the same.

The clock LED fix is largely the same (look for the 1200 ohm resistor, and jump that one, other resistor values are the same)

The right-side resistor you're used to replacing with a 330 is now on the back side of the PCB

The SMT resistors are now 1/8 watt and not 1/4 watt. Steady as she goes, captain!

The power lead that was on the front of the PCB for the right side is now gone methinks. I wired the right side LED's to the left power supply lead, and it appears to work fine. I'm sure Engifineer will find a better place, I simply didn't have the time since it was getting late and I didn't want to keep my guinea pig longer than I had to I promise I'll get pics the next time.

I know Engifineer has an 07 HVAC PCB on the way to him, but I wanted to report on this as soon as I could.

 

thanks for the report. i can't wait to do this mod. just picked up my 07 SW tc and the orange is making my eyes bleed!

 

Sounds good! There are two solder points where the old resistor was on the 05 board, right side, I am pretty sure one of those is the power lead you need, will check when I do the 07 board this weekend. I ordered new 0805 resistors to match the size of the ones on the board, they should be here tomorrow.

 

I tried them both quickly, and neither worked for me - so I simply routed to the other side of the board. Let me know if you see different results. I didn't wanna keep the poor guy here all night while I experimented with his brand new car lol

 

Well, i did another one and took a few pictures. I'll link to the pics rather than show 'em in-line since I kept them full size to retain some detail.

First, the back:

http://www.weckstrom.com/scion/07hvac/back.jpg

As you can see in the above pic, One of the 330 ohm resistors you have to solder has been moved to the back... Though the R304 location may not be necessary (or may be just plain wrong for reasons i'll outline later).

http://www.weckstrom.com/scion/07hvac/front0.jpg

In the above pic, it APPEARS that the traces require cutting are in the same physical location.

http://www.weckstrom.com/scion/07hvac/front1.jpg

As you can see, the rightmost 330 ohm resistor location is now on the back. However, if you use the existing points on the right side of the clock, the top two LED's on those side are noticably dimmer than the rest. This leads me to believe that maybe the 330 ohm resistor that was relocated to the back needs to be changed because of the added LED's for the airbag status indicators (engifineer is FAR more qualified to answer this question than I am).

In a pinch, you can simply use the power supply on the left side of the board as I did in the pic.

http://www.weckstrom.com/scion/07hvac/front3.jpg

As you can see in the above pic, the 1200 ohm resistor which is removed and jumped with hookup wire has moved to the left slighly.

UPDATE: http://www.weckstrom.com/scion/07hvac/front4.jpg shows an alternate solder point for the rightmost LED's that require the 680 ohm resistors. Make sure you scrape down the points before soldering anything to them or the solder will not stick.

 

looks good...

now to wait for dave...

 

I've already done a few '07 HVAC's. I didn't take any pics though.

The bypass is the same on the front, except the top right 330ohm resistor gets installed on the back. The 680ohm resistors get wired to the contact on the front, and I didn't replace a 3rd resistor on the back.

That worked fine for me.

 

Yeah, I took some pics, but dont like how the wiring is run, which prompted me to do something different. I will get something together as soon as I have time.

 

Any update to this? Can any of you guys post a pic of a fully wired 2007 PCB?

 

I did already - a few posts up

 

hahhaah those pictures sureeee look familiar karl!!!......lmao

 

Yeah, I wonder which poor sap had to have his car butchered in order to get those pics up

 

well it wasnt mines!!!!......but he took a chance for the best......i give the upmost props to him....hey did u tell him he was ur first 07 swap????

 

OK, ice nine. Did you replace any of the LEDs on the lower portion of the board? Like for the passenger air bag? Do those have sufficient juice to just change without rewiring?

Also reguarding this pic...
http://www.weckstrom.com/scion/07hvac/front1.jpg
You say 680ohm. But the resistor shows 189. That's not 680...

 

yeah, those you can change without issue.

 

Check my update to my post.