Questions on wiring S300 Inputs ????

kharvey · Post by **kharvey** » Sat Feb 16, 2008 1:21 pm

Below I have given a diagram for how I am going to wire some of the inputs (OBD 1 ECU). I am not 100% sure on wiring some of the switches. My main concern is if the ACS is a ground or positive type input. Also can you wire both the high/low boost switch and the table switching together so when you switch to the high boost setting it switches to a high boost setting table as well? Or do I need to run them separate?

calvin · Post by **calvin** » Sat Feb 16, 2008 2:46 pm

d2 should be ground to if i remember correctly

kharvey · Post by **kharvey** » Sat Feb 16, 2008 3:31 pm

d2 should be ground to if i remember correctly

D2 is the brake switch input. So if hooked up normally it would recieve a 12 volt signal from the brake switch. So in turn would't it still need a 12 volt input if hooked up to the data log switch?

My logic might be wrong but I'm just trying to get it all sorted out before final wiring. Anyone else?

calvin · Post by **calvin** » Sat Feb 16, 2008 6:44 pm

there goes a gnd single to the ecu from the pedal.
The switch is on/off to ground

test it

kharvey · Post by **kharvey** » Sat Feb 16, 2008 11:37 pm

calvin wrote:there goes a gnd single to the ecu from the pedal.
The switch is on/off to ground

test it

You would be incorrect the brake pedal is not a ground type switch. Its receives 12 volts from wht/grn and when pressed gives out 12 volts grn/wht to the brake lights, ECU, cruise, ABS and TCM if auto. Test it.

kharvey · Post by **kharvey** » Mon Feb 18, 2008 9:37 pm

Anyone?

Post by **Spunkster** » Tue Feb 19, 2008 10:35 am

Looking at wiring diagrams it appears to be a 12 volt input, however If you have any doubts, use a ultimeter to check to see if the witch goes to ground or 12v.

kharvey · Post by **kharvey** » Tue Feb 19, 2008 2:12 pm

Spunkster wrote:Looking at wiring diagrams it appears to be a 12 volt input, however If you have any doubts, use a ultimeter to check to see if the witch goes to ground or 12v.

I appreciate your input but I'm not concerned about the brake switch. I am re-wiring the car from the ground up. Every wire is either brand new 18 or 20 gauge, new fuse box, all new relays, new quick connects, even the engine harness. I know the wiring diagrams like the back of my hand.
I am about 99% done just wondering on my wiring for some of the extra hondata inputs.

A. Is the ACS (air conditioning switch) a ground signal? I'm pretty sure it is but just can't be certain by the factory wiring diagram.

B. Can I have both high/low boost setting and table switching on the same input? I don't see why not but just double checking.

It seems I am getting the run around without any straight answers. So please if anyone has used the ACS input or wired both table switching and boost setting together let me know. I've done a bunch of searching to no avail. If i don't get any answers I will just run it the way I have described and repost my results and maybe some pictures of the 30+ lbs. in weight savings from my re-wire.

nscirocco · Post by **nscirocco** » Wed Jul 23, 2008 3:42 pm

kharvey wrote: A. Is the ACS (air conditioning switch) a ground signal? I'm pretty sure it is but just can't be certain by the factory wiring diagram.

did you figure this out ? .. i want to use the B5 ACS as a data logging switch.

from the diagram it looks like a ground (blue/red to ecu) .. but in the diagnostics they make you test for battery voltage between B5 and chassis ground .. so i dunno'.

. i can't test it 'cause i don't have the stock a/c wiring either.

-nigel.

nscirocco · Post by **nscirocco** » Thu Jul 24, 2008 11:33 am

looks like it is a switch to ground to B5 ACS that's needed ..
as per:
http://www.hondata.com/technitrousdiagram.html