4th Gen JDM AC wire?

Post by **Merlin** » Tue May 05, 2015 4:26 pm

Does any one have any idea what the wire for turning on the JDM AC system is on the 4th gen? The heater control unit is different to the UK/US ludes so the service manual does not show it.

Any ideas?

Post by **Vtecmec** » Tue May 05, 2015 4:29 pm

Is it not in one of the suppliments? They usually have left and right hand drive layouts.

Post by **Merlin** » Tue May 05, 2015 4:33 pm

In the US they didn't get the digital blower system and the wiring is different between the two. I have ran into this problem before when I attempted to wire a new switch for my rear screen.

Post by **Vtecmec** » Tue May 05, 2015 4:52 pm

Slightly confused as to why the US manuals would have RHD layouts.

Not trying to fit Air Con to the race car?

What are you up to?

Post by **Merlin** » Tue May 05, 2015 4:59 pm

No idea

The service manual does have RHD layouts but it is for the normal slider based climate control unit. The JDM digital unit uses different wiring so the wiring guides in the service manuals are not helping me.

I want to wire up a switch to the AC wire so I can tell my Hondata S300 to start data logging

I think I will have to reverse engineer the digital climate control swaps the US guys do (which I have just found). http://www.preludeonline.com/f88/write- ... all-91791/

Post by **Vtecmec** » Tue May 05, 2015 5:09 pm

Nice idea.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue May 05, 2015 7:39 pm

So it's not Blue/Red off pin 1 out the back of the control panel then?

EDIT: No it's not.
But the circuit diagram is on page 22-4/22-5 of supplement 62ss023 and I would hazard a guess at Blue/Yellow, still off pin 1.

Post by **Merlin** » Wed May 06, 2015 9:01 am

That is excellent!!! Thank you!! That Diagram will allow me to wire up my rear screen as well

Rep+

Edit - Actually that is bloody fantastic. It is the B5 blu/blk wire (22-4) going from the AC pressure switch to the ECU that I actually need. If you earth off this wire with a switch you can tell the ECU to start data logging

It will be that the input wires for the ECU will be exactly the same. I didn't understand the problem enough to realise that it is the ECU end that I should have been looking at and not the heater control unit end

Its like a 2 min job to wire this up now

Hondata with a Civic Example wrote:The red path shows the grounding path from the ECU input B5. The input only grounds when the fan is switched on, the AC pressure switch is activated and the AC thermostat is on. This is not going to work as an ECU input. To use the AC switch for an ECU input you'll want to ground one side of the switch and connect the other directly to B5, bypassing the pressure switch and thermostat.

Hondata list of sensor and switch pin outs https://www.hondata.com/help/smanager/i ... ectors.htm

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Thu May 07, 2015 8:27 am