A/c hi/low boost

[Lazysk8r2]

Im trying to hook up my in dash A/C switch for hi/low boost. Here is a diagram that I just drew of the system, is the way I have it written below the correct way to wire it? I was told the switch is just Power, Ground In and Ground Out. I know the BLK/YEL is Power and my assumption is BLU/RED is Ground IN and GRN Ground Out, is this correct?

I am assuming I cut the Green and wire it to B5 on my ECU and cut BLUE/RED and ground it to chassis, is this correct? Am I supposed to leave the 12v BLK/YEL attached to the switch?

[Spunkster]

You need a diagram of the switch itself and you will modify the switch to bypass all the AC components.

[FreshDA9]

Here is the diagram from Honda manual



Looks like C9 and C10 (this is OBD-2 ecu reference, 00 civic manual) hopefully Spunkster can confirm this. but it looks like pin to your hi/low input and ground the other end (think im right). hopefully someone else could chime in here.

[Lazysk8r2]

Could i just run c10 to B5 on the ecu?

[FreshDA9]

from my understanding i think you will have to cut the switch out wire in a relay to complete a circuit and the end result will be whatever input you select (B5 for instance). hope hondata or someone else can jump in and confirm.

[FreshDA9]

we can figure this out but we need to know this. Does B5 need to see a ground to activate the secondary table or does it need to see voltage to activate the table change??? please Hondata, Spunkstur reply!

[Spunkster]

I believe it is a ground, but you have to look at the diagram for how the AC switch works to verify this. I do not have an ETM at this time

[Lazysk8r2]

alright im looking into how to run the wires through a relay and such

[V-Spec race development]

Let us know how you do on that thanks.

[FreshDA9]

alright im looking into how to run the wires through a relay and such

well i have been looking into B5 still trying to figure out if its a grounded input ( i think it is but want to be sure). if it is you will not need the relay and i will make a digram to show you. I have a friend helping me find out if it is or not.

O and i seen this post on Ohio hondas as well.

[Lazysk8r2]

alright im looking into how to run the wires through a relay and such

well i have been looking into B5 still trying to figure out if its a grounded input ( i think it is but want to be sure). if it is you will not need the relay and i will make a digram to show you. I have a friend helping me find out if it is or not.

O and i seen this post on Ohio hondas as well.

alright cool, thanks man!

[Lazysk8r2]

any new information?