[Heater Control Unit] Climate Control not working
Dear all,
I am writing to you as I don't find any solution to fix my Climate control (photo reminder below). I did check the forum and I found A LOT of information, but very few information on how to fix CC heater unit. (I may have miss something though..) I did check the fuse -rear wiper- and all. I arrived to the point where I found out the blowers were working fine, only the controls are not responding. Due to the rarity of this part, I decided to have a look inside. https://cimg4.ibsrv.net/gimg/www.rx7...b116b972c6.jpg I found out that the board overheated on some areas, and the SMD capacities are gone or bad looking. Literally the C2 capacity disappeared on the board below... No wonder it's not working ! https://cimg2.ibsrv.net/gimg/www.rx7...a9f91fe514.jpg I would like to change the capas, clean the board (not done yet) and see if this could be enough to fix my CC heater unit. Here is where I need your help : I am not an expert of electronics, especially in identification of the value of the capacitance. I have identified 3 different values for the capas with following spec (if you think there are more than 3, please tell me) . 1/ On one of the Capa, I have the following information on the right of the black area (negative polarity marking) : * (some rectangular drawing) 1m * 1 0 * 16V Diameter: 4mm x ~5mm https://cimg2.ibsrv.net/gimg/www.rx7...cfd7469dbf.jpg 2/ on the right of the black area (negative polarity marking) : (some rectangular drawing) 1 m? or L? R22 50V Diameter: 4mm x ~5mm https://cimg4.ibsrv.net/gimg/www.rx7...e0b7064292.jpg 3/ on the right of the black area (negative polarity marking) : (some rectangular drawing) 1 L? (I can't find out what the letter is, if it's a letter...) 10 50V Diameter: 6mm x ~5mm https://cimg5.ibsrv.net/gimg/www.rx7...c487d9c776.jpg My guess is : 1/ should be 10µF with nominal tension of 16V 2/ should be 0.22µF with nominal tension of 50V 3/ should be 10µF with nominal tension of 50V What is your guess ? Can someone confirm or teach me how to read these ? Thanks in advance for your help guys, Ben PS: I never post on forums in general, so please be indulgent :) |
Ben,
I cant provide an answer to your problem, unfortunately. What were the symptoms you were experiencing? I also have a problem with my CC unit, and have not been able to find anyone in the UK who can sort it, hence now looking further afield. Thanks Lee |
The auto climate control was only on JDM cars and only as an option on certain cars. There's not a lot of knowledge about them unfortunately, especially with regards to troubleshooting problems.
Hopefully someone with some electrical expertise can chime in on this thread! Dale |
Hey there, sorry for late answer,
Lee, Thanks for your answer. Never mind, so far nobody does ;). The symptoms were : * the fan speed cannot be selected (no light, and no speed change when turning the selector) * same behavior for the direction of the air (no light to identify in which position it is, no changes if I change through the selector) * from time to time, the blowers would blow stronger without any changes of the driver. sometime not blowing at all...) https://cimg5.ibsrv.net/gimg/www.rx7...8c4ea467b9.jpg I found some hints on the forum thanks to threads and the JDM workshop (see above), I checked the related fuses (riya-waipa (how lovely): rear wiper and the ones in the engine bay : all goods) I did some tests on the fans (engine bay), and somehow put the ECU in "test mode" (I guess) as I was able to hear/feel the different speeds of the blowers inside the car. At that point, I figure out that the issue might come either from the "A/C amp" or from the "Heater control Unit" (see below). https://cimg5.ibsrv.net/gimg/www.rx7...28245f16ef.jpg And I then you know the status from my first post. I will order some capas and test if It could change anything... At least, to be able to control manually the speed of the blowers and the direction, would be great ! Not expecting the auto climate to work in "auto mode" ^^' Dale, Thank you for your answer, yep you're right unfortunately... not enough auto climate in the market :( Actually a troubleshooting method does exist in Japanese !... but even with go*gle trad I can't clearly go through it; my Japanese skills being really limited. I can't resist to show you this one below as example (yes, I did some long evening researches in the JDM workshop) :) There are plenty, but some of the troubleshooting methods are described with specific tools... that I don't own or understand. ^^' https://cimg6.ibsrv.net/gimg/www.rx7...2c0307fbf6.jpg Anyway, I will keep you posted on this topic. But please don't expect fast answers ;) Ben |
Hey there,
In case anyone would be interested in this thread, I will post there how far I am with this issue. I did a check of the "A/C amp" just in case, and as you can see below... the board is very clean. So I exclude this part for being the issue. https://cimg2.ibsrv.net/gimg/www.rx7...1e2120f9eb.jpg Clean "A/C amp" board What I did :
Ben |
After not having the car on the road for a couple of years, and getting it back on the road this year, the CC has developed a mind of its own, switches itself on/off, changes temp, direction, and mode without human input.
Hoping to have a look at the electrics over the winter and see if I can spot any faults. Let us know if you get the LEDs (feedback) working. My re-circultation has never worked (for 12yrs of wonership) and the 'AUTO' was tempremental showing green on occasion when 'AUTO' mode was enabled, but that LED stopped working about 10 years ago. The last time (~8 years ago) I took the PCBs out, I saw nothing visually wrong, gave it all a clean (contanct cleaner) and re-fitted, no change. Next time will look to try and test connectivity/resistance. If I have a breakthough I will share. |
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