Android heat unit advice
- Thread starter Rob23
- Start date
As far as I have heard, everyone who has tried this on a diesel has encountered problems with cabin heating following installation. The Diesel heating system is different from petrol powered models because diesels are slow to warm up from a cold start. The heating system is boosted by a bypass circuit on the airconditioning evaporator (edit: Condenser) which flows hot compressed gas through the cabin airconditioning heat exchanger to warm cabin air while the engine cooling water is still cold. There are also additional electrical heating boosters in some of the air ducts (which the other cars may have as well?? idk actually).
Diesel powered Hondas are a minor percentage of world wide sales, to the extent that most people outside Europe and India don't even realise they exist. So aftermarket parts such as these aren't designed for this additional complexity. Dig through older posts on this forum to find out more. I am sure some simple (from an API programming perspective) custom circuitry to function as an interface to the additional parts and possibly sensors is all that is needed, but I have never seen anyone seriously discuss reverse engineering any of the a n a l o g u e or digital logic in this car beyond the ECU and engine. The skills to pull this off aren't uncommon. I have this idea of controlling headlight levelling with an Adruino, but like 400 other ideas I have, it is only a paper project so far.
ps.. I am speculating of course. I am not certain beyond any doubt that this is the exact reason for the trouble people have had with Android units in diesel Accords. It is however the major difference in functionality of the stock head unit, and that is the basis of my deduction. If I am wrong, I don't think I am 100% wrong.
Diesel powered Hondas are a minor percentage of world wide sales, to the extent that most people outside Europe and India don't even realise they exist. So aftermarket parts such as these aren't designed for this additional complexity. Dig through older posts on this forum to find out more. I am sure some simple (from an API programming perspective) custom circuitry to function as an interface to the additional parts and possibly sensors is all that is needed, but I have never seen anyone seriously discuss reverse engineering any of the a n a l o g u e or digital logic in this car beyond the ECU and engine. The skills to pull this off aren't uncommon. I have this idea of controlling headlight levelling with an Adruino, but like 400 other ideas I have, it is only a paper project so far.
ps.. I am speculating of course. I am not certain beyond any doubt that this is the exact reason for the trouble people have had with Android units in diesel Accords. It is however the major difference in functionality of the stock head unit, and that is the basis of my deduction. If I am wrong, I don't think I am 100% wrong.
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Okay, thats a pain, did wonder as its all on that sat nav screen and surrounds, well ill keep hunting as would want it done for music and an updated sat nav as I do a lot of big trips for work etc so would be better to have the maps big and updated, thank you for the response, ill find something
Android Multimedia Stereo Navigation GPS Autoradio Bildschirm für Honda Accord 7 2003-2007 Diesel Player Radio Car Carplay 5gwifi - AliExpress 34
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
these are proven to work
Junsun V1pro AI Stimme 2 din Android Auto Radio Für Honda Accord 7 2003-2008 Carplay 4G Auto multimedia GPS 2din autoradio - AliExpress 34
Smarter Shopping, Better Living! Aliexpress.com
www.aliexpress.com
with the following mod
but please use solder or heat shrinkable solder sleeves, twisting the strands together and taping up with vinyl tape is not going to last
all credit goes to clubhondaspirit @ https://clubhondaspirit.com/foro/to...ios-chinas-en-i-ctdi-7th/page-24#entry2371200
Brilliant thank you very much, ill translate it in a bit, and ill solder it up when I get it, and see what happens.these are a thing now, but no one in the integrated head unit megathread on clubhondaspirit have tried it yet, they're the ones who figured out which head units can be used on the diesel with a modified harnessAndroid Multimedia Stereo Navigation GPS Autoradio Bildschirm für Honda Accord 7 2003-2007 Diesel Player Radio Car Carplay 5gwifi - AliExpress 34
Smarter Shopping, Better Living! Aliexpress.com
these are proven to work
Junsun V1pro AI Stimme 2 din Android Auto Radio Für Honda Accord 7 2003-2008 Carplay 4G Auto multimedia GPS 2din autoradio - AliExpress 34
Smarter Shopping, Better Living! Aliexpress.com
with the following mod
but please use solder or heat shrinkable solder sleeves, twisting the strands together and taping up with vinyl tape is not going to last
all credit goes to clubhondaspirit @ https://clubhondaspirit.com/foro/to...ios-chinas-en-i-ctdi-7th/page-24#entry2371200
Keep us posted. I (obviously) hadn't heard of this, and I am totally getting one if yours works. The outdated Nav screen is my least favourite bit of the car. And the AU disk doesn't work on EU systems (my car is from the UK), so the map shows me driving around on the sea floor somewhere between Scotland and Norway.
PS: A quick scan of the pages on clubhondaspirit, there is a discussion of whether the AC condenser bypass valve issue is correctly solved, on the pages following mike's link. My browser translator is producing more poetry than tech-talk, so I can't see where it is leading. I've run out of reading time for today, so if you get there first, can you relay if they've worked through it?
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apparently, the operating conditions for the valve are quite specific, below 5c ambient and water temp below 75c, and it only does this when left to its own devices, not when the climate control panel is set to ac on/ac off
the gist of it is that the wire splicing disables the bypass valve's functionality. it's more of a workaround than a solution. If you install the chinky pad without the fix, your compressor will burn because it ignores the pressure reading that triggers compressor's failsafe during bypass/"heat pump" mode
with the wire splice, the pressure reading is still ignored, but it forces the bypass valve into closed position so the ac can only provide cooling, drastically reducing the risk of an overheating or overpressure event that would cook it or cause refrigerant phase change outside of the expansion valve
obviously, this could still happen, but I'm not seeing many, if any reported cases where specifically this has happened. most complaints are due to head unit quality control being shoddy, firmware gremlins etc
the gist of it is that the wire splicing disables the bypass valve's functionality. it's more of a workaround than a solution. If you install the chinky pad without the fix, your compressor will burn because it ignores the pressure reading that triggers compressor's failsafe during bypass/"heat pump" mode
with the wire splice, the pressure reading is still ignored, but it forces the bypass valve into closed position so the ac can only provide cooling, drastically reducing the risk of an overheating or overpressure event that would cook it or cause refrigerant phase change outside of the expansion valve
obviously, this could still happen, but I'm not seeing many, if any reported cases where specifically this has happened. most complaints are due to head unit quality control being shoddy, firmware gremlins etc
Thanks Mike, that makes sense. I didn't know about the conditions in which the bypass operates, and that is good information. Scanning the forum pages I was getting the idea that they didn't have a perfect integration, but I didn't know whether that was because I wasn't reading it correctly. So they basically have bypassed the heat ***ist. As you say, it is a work-around.
But you may have just have solved a problem for me.. I need to actually install a new condenser (the old one has a wombat shaped dent) and I haven't been able to find an iCTDi one for a reasonable price that also mails to Australia.. So I was planning on buying a local a non-diesel condenser, cut the bypass valve off the old one, and attach that to the new one with a custom bracket. But I can't say I find life without this heater booster all that uncomfortable, as it takes only about 5 minutes for the engine to warm up. I could probably just leave the bypass valve off, as that would not risk the compressor at all.
As much as I like the idea of a steampunk mechanical heating subsystem, it isn't really an important function. Especially if it only operates in a narrow set of conditions..
But you may have just have solved a problem for me.. I need to actually install a new condenser (the old one has a wombat shaped dent) and I haven't been able to find an iCTDi one for a reasonable price that also mails to Australia.. So I was planning on buying a local a non-diesel condenser, cut the bypass valve off the old one, and attach that to the new one with a custom bracket. But I can't say I find life without this heater booster all that uncomfortable, as it takes only about 5 minutes for the engine to warm up. I could probably just leave the bypass valve off, as that would not risk the compressor at all.
As much as I like the idea of a steampunk mechanical heating subsystem, it isn't really an important function. Especially if it only operates in a narrow set of conditions..
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I'm just a curious amateur like the rest of us lol
petrol dimensions are sligthly different but the couplings are in the right places, and they are the correct size. but beyond that it's uncharted territory as far as operating pressure goes, I don't know the specific differences