04 Honda Accord blues

had a tech in my shop that was working on a 04 Honda Accord.  by mistake he taped into the keysense wire and now the keysense does not work.  in addition it now showing circut low current faults on a few sensors one of them being the throttle position.  therefore the car runs fine at idle but does not recongnize the accelorator.  I checked the ECM and PCM and nothing was burnt out or anything, but without the keysense wire it does not of corse sense the key in the ignition.  can anyone offer any suggestions of what  I can do to get this customer's car back on the road?

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Sammy

What did he tap into the keysense wire?
Was it something that applied current of anysort?
What was he installing on the car?
Is the check engine light on?

Last ditch effort would be to reset the ecu and starting the car and seeing if it works. If this doesn't resolve the problem then it sounds like off to the dealer the car will go.

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

He was installing a remote start add on, and yes he applied pos polarity to a neg trigger which rest at pos.  However you can apply neg current to the keysense wire and it will began to work but it's not being triggered from the source. and finally yes the check engine light is on.  As I said before the car starts and runs but some of the sensors are saying low current, and thus since one of the is the throttle position it does not respond to the accelorator

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Sammy

The keysense is part of the multiplex modules and if part of the module is burned out, you have to get the entire module replaced or taken out to be repaired. Chances are Honda will just replace it then repair it. If you have friends in Honda, hopefully they will submit this as a warranty item and you won't have to pay for this part.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

where exactly is this module located?

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Sammy

can anyone tell me where the multiplex moduel is on this vehicle?(04 honda accord)

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Sammy

If you are saying the car seems fine if you tap ground to the keysense wire, then the problem must be in the ignition switch. Applying 12volts to the keysense means the voltage traveled toward it's apposing voltage source, which is the switch. If there still is ground at the input for the keysense at the ignition switch and there is no ground coming out when the key is applied, it only stands to reason that the problem is in the switch, right?

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Mike M2
Tech Manager
CS Dealer Services

might not explain the sensor errors and EMLO b

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Why oh Why didn't i take the blue pill
Darren Power

Maybe it requires the keysense not to get those codes....

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Mike M2
Tech Manager
CS Dealer Services

That's what I'm thinking as well which is again why I'm tring to fing the location of the multiplex moduel so that I can verify if it's the problem

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Sammy

try this disconnect both the negative and positive cable on the battery and hold then together for maybe 1 or 2 mintues then put the wires back on and try to start it???

usually you would disconnect for 30 sect then just touch the cables

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Why oh Why didn't i take the blue pill
Darren Power

I'll give those things a try too, but the million dollar question still hasn't been answered for me, CAN ANYONE TELL ME THE LOCATION OF THIS MULTIPLEX MODULE?  PLEASE.....

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Sammy

I had another post on this by the subject of "honda blues", but as the post got longer and longer I think answers were comming in for everything except what I was really asking for.  Million dollar question....  Can anyone tell me the location of the multiplex module(s) on a 2004 Honda Accord is a v6 coupe if that helps out any.

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Sammy

It's part of the fusebox.....

Gus


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Wherever I go, that is where I end up......

Thanks, Gus.  Anohter question for you.  So, if there is nothing burnt out at the fuse box, ECM, or PCM then I should be fine right?  I pulled all of them and inspected them carefully and nothing was burnt out.  Like I said before the keysense works fine if you put ground to it because it's a neg trigger.  but on its own it's just sitting at pos rest and not triggering when the key is placed into the ignition.  I'm wondering if there is a way to reset that part of it so that I can get everything right with the car.  Does the system somehow need to be recalabrated? 

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Sammy

You could have burnt a trace inside the fusebox. If that is the case, good luck opening it up and finding the problem.

Sammy, your not looking at it right. If you are grounding the keysense wire and everything works fine, then the problem has to be what applies the negative to that wire, right? When you put the key in the cylinder it should have a ground on the RED / white wire. If it doesn't do that then the problem ihas to be that switching circuit that gives that ground, right? That would be the ignition switch itself. Think this way too, the keysense rests at positive and turns negative when the key goes in. the path the positive current would have taken was towards the resistance, or the ground from the keysense wire. This gound comes from where? The ignition switch. Unless the keysense input has no ground it just has to be....

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Mike M2
Tech Manager
CS Dealer Services

Point taken and to tell you the truth I started to pull the circuit box on the ignition to check it out but once I pulled the harness of and found it still had polarity I wrote it off.  I'll check into it.  I guess it pays to go with you first thought!  Since every thing else checked out to be ok mabey this is were I will finally find the problem.

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Sammy

You can do the quick fix on this if you want but make sure that you tell the customer ( unless your the customer ) what has happened. In the event that the car should malfunction because the keysense wire should loose ground while driving, the customer will not come back at you after he/she finds out that you were the cause of this and didn't tell them.

To do a quick fix on this use a relay to trigger to ground from your switch ignition wire.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

I installed a starter into an 05 accord the other day, never used keysense for anything, when it remote starts the car revs fine.

also there are no check engine lights that come on without keysense.



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Shaughn Murley
Install Manager, Dealer Services
Visions Electronics
Red Deer, Alberta

I haven't used a keysense wire on the last 4 Accords that have been through here either.... all of them 05/06. All of them got a 556H.

Gus


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Wherever I go, that is where I end up......