king_pin

I am in the middle of wrapping up my b16a swap, just to find out that my 00 honda civic hx doesn't have a cabin wire plug. Im using a 00 civic ex harness. The engine harness only have 2 plugs going towards the ecu. Does 99-00 obd2b Honda civic Hx not have a cabin harness? My stock hx harness have all three plugs on the engine harness itself, so im assuming i don't have a cabin harness.

Can i use a obd2(96-98) ex harness? Since i don't have a dash harness?
Any suggestions would be highly appreciated

94EG8

HXs are weird, '99 - '00 models remained OBD2A when everything else switched to OBD2B. Yes in this one case you can use a '96 - '98 EX harness.

king_pin

Thank you..
96-98 ex harness does work. Confirming for future reference.

roro1

i am having a similer problem,im putting a 00 hx motor engine harness and ecu into a 00 civic dx,can i use a obd2a to obd2b jumper harness to make this work, my dash harness is where im having my ploblem

94EG8

No, you'll need to reuse the DX engine harness (or get a '99 - '00 EX harness) and modify it to work with the HX engine, you'll need to add vtec, knock and EGR valve wiring.

roro1

i do not have the original dx harness,
can you please tell what all i would need to do if i get a 00 dx harness,i know that harness will not have vtec
also what all would i have to do if i get the 96-98 ex harness then i would have to get a ecu jumper right?
and witch ecu would i use
thanks man!

nextgen

Does anyone know what harness i will use to put a y8 in my 2000 hx? The engine is from a 99-00 civic?

Ive heard i can use my stock harness, and then i heard i should use 99-00 ex. And then i see this thread about using 96-98

94EG8

For a '99 - '00 DX harness you will need to wire in vtec, knock, and EGR as I mentioned in my last post, see pic for details, you'll also need to convert from a 3 wire to 2 wire IACV




You can't use a '96 - '98 harness. You'll need a P2N HX ECU and an OBD2B to OBD2A adapter harness.

Reuse the original harness, you'll have to convert from a 5 wire O2 sensor to a 4 wire. You could use a '96 - '98 EX harness if you wanted to, but it's not really worth it for the minimal amount of wiring you need to do.

Btw, both of you should probably create your own threads.

roro1

if a get a 99-00 ex harness will i still use the obd2a hx ecu

94EG8

Yes, but you'll need an OBD2B to OBD2A conversion harness as OBD2B HX ECUs don't exist.

roro1

ok,how hard would it be and will this even work,can i pull the dash/cabin harness from the 00hx car and put it into the 00 dx hatch

94EG8

You can. I'm not sure hard is the right word, it's definitely time consuming though. Make sure if the car is a 5 speed you get a 5 speed harness (especially when dealing with an HX, the automatics in them are a CVT and the wiring is quite a bit different than all other civics)

roro1

what all would be involved in doing the cabin harness swap,i still have the whole car that my hx motor,harness and ecu came out of,but one person told me i would have to change everything,floor harness fuelpump harness even the headlight harness.by the way thanks for all your help

94EG8

You'll have to pull the dash, A/C (if equipped) heater core, pedals, seats etc. You will have to change pretty much everything as I recall.

roro1

PEDALS!!!!!!!!!!

94EG8

yeah, the harness kinda runs somewhat behind them, it's inside a plastic enclosure at that point. Although once the dash is out it's pretty easy to remove them.

roro1

what about headlight harness

94EG8

Right off i'm not sure. I *think* you can leave that alone though.

roro1

i think ill give this a try seems like alot of work,but wont cost me any more money just time,you think its a good idea to swap the dash harness

94EG8

If you have the stuff right there and it's not costing you anything sure, saves you from buying a conversion harness.

roro1

thanks for your help im sure ill be back tomorrow asking more questions.

roro1

success! i swapped the cabin harness from the hx to the dx today! man what a job.
turned the key and fired right up! still have some finishing up to do,no plug on the hx harness for the rear wiper. might try to hard wire it

94EG8

Congratulations you probably have the only correctly swapped D15Y5 in a '99 - '00 Civic in the country. IIRC the pinouts for the rear wiper are used for power locks on '99 - '00 Civics (makes sense because no model has both a rear wiper and power locks) but you could run the wires seperately.