MR2 Owners Club Forum banner

1 - 20 of 54 Posts

·
Registered
Joined
·
104 Posts
Discussion Starter #1
Thanks goes out to tksmr2 for shipping me an extra power window relay and switch he had so I could figure out how to do this, as I don't have an MR2. It's rather easy to pull this all off, you won't need much and it will only cost you a couple of dollars. Let's get started!

Supplies:

- Sidecutters (wire cutters)
- Soldering iron
- Solder
- 3 diodes (1N4004 is what I used)
- Exacto-knife (or similar)


Let's start with the switch, how you go about doing this is up to you, but be careful if you decide to disassemble the switch to do it, there is 3 little tiny springs inside and little pieces of plastic, you do not want to lose. Luckily I had extras from a spare Celica switch I had lying around. Basically you want to change it from looking like this:


To looking like this:


That's all there is to modifying the switch, I was surprised it was this simple, as modifying the AE86 switch is much harder, and takes much more effort.

Now, moving onto the slightly harder, but not too bad part, modifying the power window relay to support the auto up function.

Pop open the relay (not hard, you can use your fingers):
 

·
Registered
Joined
·
104 Posts
Discussion Starter #2
Slide the PCB (circuit board) out of the relay housing, it's not held in with anything:


This is what the PCB looks like from the factory, you can see 2 empty spots on the board, and 1 piece of wire linking 2 traces:



What you need to do first is remove the link piece from the circuit board:
 

·
Registered
Joined
·
104 Posts
Discussion Starter #3
Next, add the 3 diodes to the PCB, make sure you get the polarity correct! It will NOT work if you put one or more on backwards:




I've tested the AW11 modified relay in my AE86, and it worked as expected, without any glitches. Auto up sure is nice. The one final thing that you need to make sure is that you have a wire going from Pin 7 on the switch's connector to Pin 7 on the power window relay, this is the Auto Up wire, on my AE86 harness the wire was already in place, so I had to do no modification. Like I said at the beginning, I do not own an MR2, so I cannot check the harness myself, sorry.


Hope you guys get some use out of this, I know there was some people out there that really wanted to do this (since all the SW20 guys can do it, heh!).


Jeff
 

·
Charter Member - Group W
Joined
·
2,028 Posts
What does auto up mean? Is that one touch raise? My car doesn't have one touch down. Should it?
 

·
Registered
Joined
·
104 Posts
Discussion Starter #11
All factory AW11 power window setups have auto down (one touch down), if it doesn't, you either don't have factory power windows, or it's broken.

From what I've read (haven't had any good confirmation yet) you guys do have the wire in the harness for the Auto-Up, so that makes it easy. If you do it all and it doesn't work, check the harness for the wire.

Soldering it won't be too hard. The 2 hardest things are getting the link wire off the board, I used a solder sucker to suck the solder off the bottom of the board and just pulled it out. You can also use pliers to pull it out while heating up the solder on the bottom, either way.

The second hard part is making sure you do not leave the soldering iron there too long, too much heat will fry the diodes, and you don't want that (a fried diode allows current flow both ways, a good one only allows current flow 1 way).

You should be able to pull it off I think. Good luck.
 

·
Registered
Joined
·
545 Posts
this is amazing, thanks for figuring it out!

my only question is what does it do if something is stuck in the window while it's rolling up... an arm, for instance?
 

·
Registered
Joined
·
3,867 Posts
chevelle396 said:
this is amazing, thanks for figuring it out!

my only question is what does it do if something is stuck in the window while it's rolling up... an arm, for instance?
probably keeps going and burns out the motor... If it functions like the auto-down, it will go up until it reaches the top, then it would stop - Or if you hit the "down" button it woudl stop where its at... thats what I'm guessing anyway.
 

·
Registered
Joined
·
104 Posts
Discussion Starter #15
It was a factory option, just not in North America, every Toyota that has Auto Down in North America has Auto Up in Japan. But you are correct, North America did not get it due to safety.

The thing about DC motors is, if something obstructs them, their power consumption jumps through the roof. When the motor hits the bottom, or the top, it draws a LOT more power, and the relay shuts off.

It doesn't actually take that much to get it to stop, and it will stop with your hand in there, it doesn't even hurt really.
 

·
20v Super Two
Joined
·
5,026 Posts
jeff lange said:
It was a factory option, just not in North America, every Toyota that has Auto Down in North America has Auto Up in Japan. But you are correct, North America did not get it due to safety.

The thing about DC motors is, if something obstructs them, their power consumption jumps through the roof. When the motor hits the bottom, or the top, it draws a LOT more power, and the relay shuts off.

It doesn't actually take that much to get it to stop, and it will stop with your hand in there, it doesn't even hurt really.
Very informative post!
 
1 - 20 of 54 Posts
Top