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Mrtony5 04-16-2014 04:16 PM

2003 Civic Hybrid EOC Kill Switch/Injector Cutoff simple how to
6 Attachment(s)
I looked all over for a diy of how to do a kill switch for a civic hybrid and couldn't find much. I finally found a wire diagram of the injector relays.
The Yellow/ Black wire is the ground for the injector relay number 1 which is a brown relay on my car, that is the one I installed a switched off.

Materials list:

Momentary switch normally closed
Wire (14 gauge)
Wire connectors
Misc ties-tapes

How to:

Locate the relay bank which is behind the glove box
remove the kick panel under the glove box
Lower the relay bank by pushing the lever and lifting the bank up and out
Cut the yellow/black wire
Splice in the wire for the switch
Run the wire to the gear shift or where ever you want to mount it
And enjoy.

Only my second DIY Tread so don't hate.
Any positive input is greatly appreciated
Pictures speak a thousand words see below :thumbup:

Cobb 04-16-2014 05:33 PM

Is the switch on the one yellow/black stripe wire? From the photo it almost looks like the red wire was spaded. :eek:

Mrtony5 04-16-2014 06:19 PM

1 Attachment(s)
I made sure it is the Yellow and Black wire. I'll see if I can get a better closeup of the pic. So many wires right next to each other.

Edit: Pic about the closest I can get with cell phone camera.

Cobb 04-16-2014 09:44 PM

Thanks bro. Ill have to check my book on my insight. I want to say each injector wire grounds back to its own pin on the ecu vs being clumped together to the relay like yours. Be nice to FAS the car as autostop is flaky. Then add another switch to the ignition start lead. Maybe a centered switch with a circuit on either side to either start or FAS? :thumbup:

darcane 04-17-2014 02:14 PM

In this thread, we figured out basically the same thing. While yours is a hybrid, I think this part of the wiring is the same with our conventional Civics. I was concerned with cutting that particular wire because I wasn't sure if it would kill the immobilizer circuit also.

Any trouble with it when you kill the engine? Do you need to key off/key on in order to restart?

Mrtony5 04-17-2014 05:40 PM

Its only been one day but It seems to be working great. I DO NOT have to key off to restart. I can either bump start the engine or just turn the key to start if I'm not rolling. I don't know if I have the immobilizer system or not.

I do have a bad IMA battery, been bad since I bought the car so both my Check engine light and IMA light are on so I don't know if this mod will cause a CEL.

Mrtony5 04-18-2014 12:53 PM

I couldn't find that thread when I was searching before thanks for posting that here. :thumbup:

I read through it and what are the benefits of using a relay for the switch ?:confused:

darcane 04-18-2014 01:21 PM


Originally Posted by Mrtony5 (Post 420754)
I couldn't find that thread when I was searching before thanks for posting that here. :thumbup:

I read through it and what are the benefits of using a relay for the switch ?:confused:

The way I have it wired up, if my switch fails or the wiring gets damaged, the car will still run.

The amps are low enough that amperage isn't really a concern here.

Mrtony5 04-22-2014 04:01 PM

Ahh I see. :D

I just ordered a relay to modify the wiring just in case the switch fails.
I will update the wiring process once I get it done.

HilseeJ 04-24-2014 01:22 PM


Mrtony5 04-24-2014 01:52 PM


Originally Posted by HilseeJ (Post 421388)

Do they still make Civic hybrids that are stickshift?

Are there any hybrid cars that are that are currently produced?

Sorry, I was just shocked to see this.

No they don't offer them as sticks anymore. I think the CR-Z is avalible with a stick but other than that I think all hybrids are CVT. I still think sticks get better gas mileage tho.

Only the 03-05 civic hybrids had sticks but they are pretty rare from what I hear. I'm glad I got my hands on one.:thumbup:

Mrtony5 05-08-2014 02:08 PM

6 Attachment(s)
Finally got my relay in. Its a 5 pin and I used the nc terminal so when there is no power going to it the wires are connected.

Here is how I wired it up this time. I used a lighted switch in the dash so if my wife drives the car I can turn it off so she doesn't accidently kill the car.

Cut the yel/blk wire and put one end on terminal 30 and the other on 87a
Wire 85 to ground
Wire 86 to one end of your momentary switch
Wire the other end of your momentary switch to the load positive of the lighted switch
positive on lighted switch to fused positive
Ground on lighted switch to ground

see my lovely drawing if that helps at all
(numbers on relay may be different for different brands)

When the power is sent to the relay it powers the electromagnet which moves the contact from on terminal to the other. So when the switch is off( no power) the normaly closed terminal are connected when power is sent it breaks the connection which kills the car.

If I have any problems with either switch the car will still run. :thumbup:

Another interesting fact about the civic hybrid is that when you come to a stop and it doesn't autostop you can force it by putting it in 5th gear and letting the clutch out to kill the engine then when you press the clutch back in and put it in 1st it will restart automatically. Prolly not good on the clutch tho.:(

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