RomRaider

Did you use the pin for the rear defroster, or did you guys find a pin that is un used?

On a usdm the pin is not used. On a jdm it is a pin used for the auto intercooler wash. When I finish this I'm going to look into the defrost button and see what can be done about the timer. I could even disable the rear defrost altogether as I never have had to use it. I have never looked at how its wired so if someone has any input speak up.

Wiring in a switch to the ecu pin has really been a pita. It had better work lol.

here is a diagram of the system, dont know is by removing a relay or fuse will lose the output signal to ecu too, this timer might be set by the module in the diagram, not sure about it but could be. if what you are looking for is disable the heating element on glass i would say is just easier to unplug it from its connector it self (B97), if is not what you meant or need it to know let me know

I would much rather put it on the un used pin on the ECU just in case I want to use the defroster.
Could you give me the pin number? I'll wire one up to my intercooler switch as soon as you tell me it works for sure.

Wouldn't you have to modify something in the map it self for it to look the trigger in the I/C switch and not the deffroster?
i think i have the diagram for the I/C system somewhere!! i look for it and post it for you!

Actually it is possible to use the defogger pin on the ecu without affecting the defogger's function. The pin on the ecu is A3 (Connector A pin 3 "A:B134"). You could simply snip the wire going into A3 and wire a switch to it to ground the pin when the switch is on.

The defogger button on the dash would no longer control the pin but it would still function the window defogger system as stock. Then you would just use your newly wired switch to control any ecu feature that you select to be activated with the "defogger switch".



Also, im looking into using auto trans inputs. There should be a couple pins we can use that would normally be used by the AT.

you are right, so its actually will be possible to have different switches to control different functions? for example, one switch for AL other for launch control?

I think jason has the code to look at the defrost when defrost is enabled and at the auto wash button when the defrost box is unchecked. The auto wash is pin b12 on the ecu. Its not being used on usdm ecu but is on the jdm.

I know for a fact that map switching takes place with the defrost box enabled and the defrost button on. The timer is a problem and also, if you got around the timer you would still need a seperate switch on the defrost element itself to keep from having the defroster on the whole time your using map 2. I think the best option is the seperate switch on pin b12 if it works.

Trying to get a wire in the plug without the right clip is a pita. I used a clip from a stereo plug I had layin around. It wasn't the correct size but I got it to work with a little finesse . I hope I get time to fish the switch and test it tonight.

What is the function of the defrost wire going to an ecu pin? What does the ecu use it for?

was wondering the same thing? maybe voltage, i know defroster drain a lot of it, maybe it change the duty on alternator?

now, in my case i use a USDM ecu, will this map still see the trigger is i use the pin b12, I/C sprayer switch? maybe the internal driver of the ecu for I/C is in there even when USDM didnt use it? or just JDM ecu?

That's what I'm going to fid out when I get my switch wired. If it doesn't work I'm going to do as jason suggested, cut the ecu wire for the defrost and use it to switch. I know it works for switching per the test I did.

I cut a wiring connector out of an old subaru a while back for spare pins when doing STI cluster conversions, so I'll use one of those. If you want me to mail you one I've got plenty.
I'll look at wiring up that switch this weekend if yours is successful.

Oh, and quote fail for you!

If I can't get any from radio shack I will pm you my address.

Quote fail fixed lol...

I can tell you that the pin that you are trying to ground with a switch in between will work if you are using pin B12. I did the same thing to get Group N map switching to work on my JDM ECU running a 207 since my chassis harness is still a USDM WRX despite having a JDM ECU and a JDM Engine. I made a switch so that I can turn on antilag/Group-N mode on a whim. Works incredibly well. I'm surprised I didn't post anything on RR about it. I know I posted up on the Group N thread on NASIOC.

You should have hit me up as well, I had a couple extra ECU pin pigtails leftover that IA Performance sent me (the same pigtails they use for their AVCS harnesses).

http://www.youtube.com/watch?v=lvvE-BFq-Lw

I am very interested in this carberry ROM. Once I get my cable back from a friend that I am letting borrow it, I'll be checking it out.

What CEL's are you guys getting through learning view when running this ROM?
Ever since I have ran the SD map I'm getting a few odd ones... I'm not sure if they're normal or if they're pointing me to what's causing my bad idle and sputter...