Honda Accord Auto Lock With Speed Switch DIY

Moderators: KPierson, SFLG35

Honda Accord Auto Lock With Speed Switch DIY

Postby KPierson » Tue May 23, 2006 10:43 pm

I recently completed the installation of an auto lock module with a speed switch in a 2004 Honda Accord Sedan. The car already had a remote start system on it, so I didn't get the best pictures but I still ended up with some good information.

First, I prepped the two modules to get them ready for install. I used my electric drill to twist the blue (Lock output) and green (unlock output) wires together on the auto lock module. I did this because the lock and unlock wires are in the same harness, so it will keep things a little more organized.

I then soldered the short red wire to the long red wire, since I want the module to operate in instant trigger mode. If you need the module to work in 6 second time delay mode do NOT hook these two wires together.

Next, I connected the black (ground) wire from the speed switch to the black (ground) wire from the auto lock module. Both modules will be grounded at the same point, so I tied them together.

I then connected the orange (Switch output) wire from the speed switch to the yellow (ignition input) wire of the auto lock module.

Finally, I soldered in a programming switch. This isn't 100% necesarry, as once the module is programmed one it should never need to be programmed again so the switch does not have to be permanent. I chose to permanently install it so that I can test the module out easier over the next few months (this is my fiance's car). I connected one side of the normally open momentary pushbutton to ground and the other side to the purple wire of the speed switch.

After all my prewiring I was left with 6 wires:
Red: 12VDC
Yellow: Ignition
Black: Ground
Blue: Lock
Green: Unlock
Blue: Speed Sense Signal

Image

I mounted the modules in an open spot on the right side of the drivers side under dash (near the center console). I wire tied the modules to a bundle of wires there to keep them from rattling. I routed the black, yellow, green, blue, and red wires towards the steering wheel. The door lock wires are easily acessible so I did them first.

LOCK: pink/black at MICU (fuse box)
UNLOCK: pink/blue at MICU (fuse box)

Since the remote start included keyless entry there were already connections made to these wires. I simply tapped the remote start wires. Green (Unlock) from the KPtech auto lock module would connect to the pink/blue wire in the car, and blue (Lock) would connect to pink/black.

Image

Next, I went for the 12vdc and ignition signals. There is a big loom of wires running up to the steering colum. Inside the loom you will find the 12vdc and ignition signals. Once again, since the remote start already tapped these signals I just used the remote start wiring. Also, I installed the supplied fuse in between the KPtech Red (12vdc) wire and the Honda 12vdc wire.

12vdc: White (big loom going up to steering column)
Ignition: Black/Yellow (big loom going up to steering column)

Image

For the black (ground) wire I crimped a ring connector on to the end of the wire and used a self tapping screw to attach the ring connector to the metal underdash. The Honda provides several good grounding points, as most of the underdash is metal.

Finally, I located the vehicles VSS (vehicle speed sensor) wire.

VSS: Blue/White - PCM on top of transmission tunnel, behind center console, access from passenger side.

To measure a VSS wire you need a meter that will read frequency. I used my low end Craftsman meter (Sears, $30) to verify this wire. The particular Craftsman meter is capable of reading Hz, so I attached the black lead to ground and the red wire to the first blue/white wire I found at the PCM. I set the meter to DC Hz and I drove the car up and down the street. The frequency reported changed directly based on speed, so I was confident that I had the right wire. I connected the blue wire from the speed switch module to this wire.

Image

Up next was programming the speed at which the doors locked. I started the car and drove down the street. I believe the doors locked at around 20mph. I was looking for 10mph. With the doors locked I pushed and held down the programming button. The doors immediately unlocked. After five seconds of holding the programming button down the doors locked back (this indicates programming mode has been entered) and I released the programming button. I accelerated the car to 10mph and then pushed and released the programming button again. I stopped the car, shut the ignition off, and then restarted the car. I drove down the street again and right when I hit 10mph the doors locked! I stopped, shut the car off and the doors unlocked!

Total install time was about 60 mintues from start to finish. For your first one I would guess the install would take about 120 mintues from start to finish.
Kevin Pierson
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http://www.KPtechnologies.com
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 1:57 am

Hello,

I just recently purchased four modules from you to install in my 2007 TSX. I've got two done flawlessly, but this one is throwing me.

I have everything hooked up aside from the short red wire (doing the time install), and the orange wire. Where does the orange wire go exactly?

I tried looking up where the door pin is but I only hear something about a 5 pin plug at the back of the fuse box.

Now, I see four wires going into the smaller green plug directly above the large plug where you tap into the door lock and unlock.. is that the correct spot and if so, what wire? I think there were white, pink, green, and maybe a brown?
Image Here you can see a red wire sticking out of the plug in question. Since I'm not doing the speed switch this DIY didn't help me much at this stage.

Also, what happens differently if I don't hook up the orange wire? As of now it seems to work fine. I'd like to know what functionality I'm missing. Truly, I'd love to have an automatic lock on drive, and unlock on park. If I could figure that out I'd be happier.

Any help is appreciated. I'd love to get an answer soon because I'm going to be tearing the car apart this weekend to install the side mirror tilt, and I'm hoping I can get that done without any problems.

Thanks.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby KPierson » Fri Jul 02, 2010 6:24 am

The orange wire is for the door pin input and it prevents the doors from autolocking if the drivers door is open at any point during the time delay. This is an "anti lock yourself out of the car feature".

My info shows that the door pin is green/red at a green plug behind the fuse box.

As far as transmission locking you would have to find a wire that changes state when you take the car out of reverse. There probably is such a wire, it would just be hard to find.
Kevin Pierson
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 11:06 am

I was hoping you had a picture of the plug since I'm sure people don't all install the speed module too. Damn. I have no clue what plug it's referring to and if it's behind the fuse box that sounds like I'd have to remove it. Also not sure how.

Thanks for the explanation. Aside from the wire colors being different from the Honda you installed on the locations were identical. If you can ever get a pic of the door pin please let me know. And what if I want all doors to have this function? Just splice it into all four wires?
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 12:48 pm

MICU_Diagram_5Pin_Location.jpg
This is where the plug is.
MICU_Diagram_5Pin_Location.jpg (121.93 KiB) Viewed 90 times
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 12:51 pm

5pin_Green_TopRightBack_01.jpg
5pin_Green_TopRightBack_01.jpg (115.48 KiB) Viewed 90 times
5pin_Green_TopRightBack_02.jpg
5pin_Green_TopRightBack_02.jpg (133.74 KiB) Viewed 90 times
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 12:53 pm

Kevin, if you could clean these posts up so they're more visible I think everyone would appreciate it. Sorry for not knowing how.

I finally found it this morning. Soldering in there was a PITA, but it works great. Not a whole lot of info out there, but the color from you helped :)

Hopefully this can help others. I might put this on your acurazine post too later after work.

Thanks for the help and the modules. Look forward to the mirror tilt install this weekend. Not a whole lot of info out there for that one on a TSX yet.

EDIT: ok maybe I didn't do it right. It worked fine during testing but now it's not locking with the door closed. Only unlocking on ignition off. Hmmm. It's working off and on. Is there a timelimit between when you can test starting the car and shutting it off? Seems like it's getting tripped up sometimes.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby KPierson » Fri Jul 02, 2010 1:37 pm

There is no time limit, you just need to make sure the door is not opened at all after the ignition is turned on. The info I found showed that that wire covered all 4 doors - maybe it is actually a dome light wire and that is why it doesn't always work?

I don't own the Accord that I tested all this out on anymore so I won't be able to snap anymore pictures.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 1:53 pm

Ok. Sorry but what do you suggest? Is there another wire I should try?

I'd rather remove it than have it only work sometimes. I might just forget that wire and hope I don't lock myself out. Not ideal.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby KPierson » Fri Jul 02, 2010 3:54 pm

Did you test the wire with a volt meter before connecting it?

Nevermind, I found this:

http://www.wiringinstructions.com/v2/wi ... bmit=PRINT

According to their info you did in fact connect to the dome light. The drivers front door is listed as dark green but it doesn't say where the wire is - perhaps in the same harness / area as the dome light wire?

EDIT: I found this as well:

Door Trigger Wire (-): The left front door is green in a 16 pin plug, pin 15. The right front door is light green/red in a 14 pin plug, pin 12. The left rear door is green/yellow in a 16 pin plug, pin 14. The right rear door is green/white in a 14 pin plug, pin 13. Use all four wires and diode isolate each wire.
Door Trigger Wire Location: Rear of fuse box
Kevin Pierson
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 4:14 pm

I figured it was correct because half of the info I found online said a five pin green plug on the back of the fuse box (I believe that's the only one) and the other half lists those mysterious 16 pin plugs but nobody seems to know where they are. Could you hook it to the driver door lamp? Doesn't that use the door trigger?

I'm not an electrical genius. These are really the first set of mods I've done.

What should the correct wire meter and when? I looked through the instruction manual and isn't see info on voltages in this regard. I'd assume there would be no current then when the door is open there is 12v? That could be the dome light, door lamp, etc. Guess I gotta search some more.

It would be in that fuse box though right? I wish there was a diagram. The one that said the five pin plug was obviously wrong.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby KPierson » Fri Jul 02, 2010 5:17 pm

The issue most likely stems from the fact that all the sites seem to be grouping the '04-'08 in one sheet. Things change between years so that may be the issue.

The door pin most likely reads 12vdc when the door is closed and goes to ground when opened. You can test this by grounding the black lead and putting the red lead on the suspect wire and opening and closing the door. You can also check this by putting the black wire on the subject wire and putting the red wire on the KPtech long red wire. In this configuration the meter should see 12vdc when the door is open and 0vdc when the door is closed.

You may be able to get the light in the door if it is only on when the door is open. I would look for the four wires listed above as being door pins and see if you can find a plug that has all four colors, then test the dark green one.
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Re: Honda Accord Auto Lock With Speed Switch DIY

Postby MeHoo » Fri Jul 02, 2010 6:07 pm

Ok thanks Kevin. I think I'm going to unhook the fuse panel and check it all out.

If I figure anything out I'll try and get pics.
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