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Discussion Starter #1 (Edited)
I did this mod a few months ago but I finally got the pictures off my camera and finished up the Visio diagram for the circuit so I figured I would share.

I installed a Harman Kardon Drive+Play for my iPod a while back and the location of the stock hazard switch was the perfect place to put the control knob. Only problem, what to do with the hazard switch? I had hoped it was a simple SPST switch that controlled the blinker relay but why would Honda design something that simple when they could use a TPDT (that's right, tripple pole double throw) switch instead? You can exactally pick these up at Radio Shack so I couldn't just buy a simple switch and wire the stock harness to it. I also didn't want to reuse the stock switch because I've been dying to get one of those big red "aircraft" switches on my dash. My only option was to find a TPDT relay and wire it up with a simple SPST switch controlling the coil. Hence, this contraption.


Note the in-line fuse on the power lead going to the switch. The circuit I tapped for the power is already fused at 15A but I wanted a seperate fuse for the relay coil. Since the coil draws about 0.2A I figured I was safe with a 5A fuse. This way if the coil or switch shorts it will blow the 5A fuse before it blows the 15A fuse under the hood.

Based on the pin outs given in the Service Manual (that green thing the circuit is sitting on) I was able to design this circuit:



Which is based on a very badly hand-drawn piece of crap...



So the fabrication was pretty easy, I just used 16ga wire for all the leads with 3/8" female spade connectors on the ends to connect to the relay and switch. I did run into two snags. First, I purchased a TPST relay by accident but luckly it still had the contacts for the second throw so I was able to solder a lead directly to the contact. Second, hooking into the factory harness was a challenge because the male spade connectors needed to be about 1/8" which is, again, not something you can buy at Radio Shack. I ended up using 1/4" spades and grinding off half their width with a Dremel.

Here's a pic of the contacts on the relay. This gives you the pin numbers used on the diagram above



Here's a closeup of the relay with the ratings and part numbers. I got it from www.allelectronics.com, click here to go straight to the part page.



Finally, the installed pics.




I think the whole thing too me about 2-3 hours not including the time it took to track down the relay. The only hard part was getting my handmade 1/8" spades to stay in the factory harness. It took some creative electrical taping but I managed to get something relatively secure.
 

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Nice spot for one of those griffin knob USB controllers for those of us wanted to istall a car PC. Is it possible to use a fog light switch to control the hazard lights?
 

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Discussion Starter #5
gibroni said:
Nice spot for one of those griffin knob USB controllers for those of us wanted to istall a car PC. Is it possible to use a fog light switch to control the hazard lights?
You can use any switch you like but you will still need that relay and all the wiring behind it. The switch I used was a simple SPST which is what fog lights generally use.
 

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Ah ha! So you can run the flashers off the OEM fog light switch. So can I get the '07 fog light switch and use that for fogs or the flashers? I'm guessing Yea.
 

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Nice mod! But that Devil Duck is the Bomb! Now I need to find a Devil Duck to match my E.

Cheers
 

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need some coaching about similar switch...

hi, i just need some coaching how to remove that gear shifter plate to install that extra switch :roll:... would appreciate pix too. thanx
 

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The trim ring just snaps into place. I saw a picture from the tech manual that says to remove the pocket or subwoofer below the shifter then use the handle of a hammer to push the trim up from underneath. I'm sure that it could be pryed up with a small screwdriver or putty knife wrapped in a rag.
 

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Discussion Starter #12
hi, i just need some coaching how to remove that gear shifter plate to install that extra switch :roll:... would appreciate pix too. thanx
You don't need to remove anything else to get that plate out, just pry with a small phillips head wrapped in a paper towel or something else to keep the driver from scratching the plastic. If you have an automatic you can also try removing the plastic cover from the gearshift release and prying/pulling from there instead.
 
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