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2014 Honda Civic Hybrid in White Orchid Pearl
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Discussion Starter · #1 ·
I just finished installing a 4.5L washer fluid reservoir with level sensor (from the Canadian model) in my 2014 Civic Hybrid (US). I was hoping to find a connector for the sensor so I could get a warning on the dashboard when I was low on fluid, but no avail. So for those of you in Canada (or those who have the Canadian model); what's on the other end of the wiring harness that goes to the sensor? Also, is the harness available from Honda?

Thanks in advance!
 

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2014 Honda Civic Hybrid in White Orchid Pearl
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Discussion Starter · #2 ·
As it turns out, the sensor terminates at the instrument cluster. And grounding that pin on my cluster does nothing. So has anyone here done any cluster wiring?
 

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i check mine when nothing comes out of the nozzels when i activate the switch. get home, fill it. easy peasy -this being my non-honda owned cars.

actually, my dealer fills it whenever i need them too. just drive in, ask them to top off fluids, and they do between oil changes. always has since first honda i've ever owned in 1988.
 

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2014 Honda Civic Hybrid in White Orchid Pearl
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Discussion Starter · #5 ·
Yeah, I know it's a lot of work for a little thing. But my ultimate goal with this car is to turn it into something that could wear an Acura badge without any questions. I've already added rain sensing wipers, and padded and lighted sun visors; if this is something as simple as adding a few electronic components, I doubt it'll be much worse than either of those.
 

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I believe this is a worth while thing to figure out.
For methanol Injection, a larger tank is fantastic (soon, I hope soon).
For anyone living in the salt belt, a larger tank is also wise.
 

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2014 Honda Civic Hybrid in White Orchid Pearl
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Discussion Starter · #7 ·
All right, so, if one looks at the back of the instrument cluster, there are some open pads for electrical components. That's a pretty standard practice - just design the board once and use different components depending on the application (in this instance, US vs. Canada). kev604, would you happen to have a picture of the back of your instrument cluster? I'm thinking that area right below the connector is the difference, I'd need to know which components go there.
492070

Also, since the odometer data is stored in that cluster, I need a way to back it up before doing this.

I realize I may have waded into some deep waters here...
 

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2014 Honda Civic Hybrid in White Orchid Pearl
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Discussion Starter · #9 · (Edited)
Hi all, it's been a year, and I've recently started probing the cluster circuit board (see above photo) to see if I can figure out how to make this work. And unfortunately, it looks like it may be quite involved, unless I am missing something. Here is what I know so far.

The actual light circuit is made up of an LED, a resistor, and an NPN BJT (or N-channel MOSFET, same principle). Not only are none of those components installed, but when I put the cluster into test mode (instructions here:
), the main microcontroller (large Fujitsu chip in above photo) doesn't even send out the signal to turn the light on, so nothing would happen even if all three components were present.

According to the shop manual, pin #11 on the 32-pin connector connects to the washer fluid level sensor, and probing it should show 5V if the washer fluid reservoir is full (i.e. no warning light) and ground if the washer fluid reservoir is empty. On the circuit board, that pin connects to an outline that looks like it could house a resistor or jumper. The other side runs through a 100kΩ resistor into the microcontroller. I probed it with the cluster on and saw the required 5V. Unfortunately, grounding it had no effect.

Some good news, the US iMID supports the warning message and I know the B-CAN message the cluster needs to send to activate it. Unfortunately, this message is used for all of the warning messages (the data changes depending on which messages are present), so I can't just build an Arduino circuit that would send it. It has to come from the cluster.
494115


It's pretty clear to me that the cluster microcontroller "knows" that it is not a Canadian cluster and turns off support for the low washer fluid light. I have two theories as to what needs to be changed to add it. First, a simple pull-up/pull-down resistor or jumper that the Canadian model has (or does not have, the US does). Adding or removing that part will tell the microcontroller that the "low washer fluid" warning system is present and to turn the warning light on accordingly (assuming all the other required parts have been added). The other theory is, and, unfortunately, I think this is much more likely, the microcontroller's EEPROM needs to be changed. It is a Fujitsu MB91F, for those who are curious. I don't know how I would even start with that. Maybe it can be programmed through B-CAN or F-CAN, I know some car makes allow similar "flashes" (e.g. BMW).

Yes, I realize that most people would consider this project not worth the trouble. But I think this feature would be very useful, especially for those who live in the snowbelt.

Apparently all of the components are present in the 10th gen Civic, so this mod is much easier. US Civic low washer fluid warning

I'll keep digging and probing and let you know what else I find out. If anyone has any information on this, please share. Is it possible that this can be turned on through HDS?
 
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