Nissan Leaf A/C compressor 92600-3NF0A

[abetanco]

Hi DaveEV, Thanks for asking about my code. I apologize, once I finished this project, I moved on to some different projects and haven't programmed Arduino in a while. However, based on my recollection, I believe you are correct about pin 18. I don't remember exactly how pins 7 and 5 function. I'll have to find my original code, look at the arduino in my truck, and get back to you on this.

[DaveEV]

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp control potentiometer, instrument gauge potentiometer, VW Golf preheater element relays, and LeafCAN read. Hopefully it can be a starting place for a lot of people.

[maiks]

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp control potentiometer, instrument gauge potentiometer, VW Golf preheater element relays, and LeafCAN read. Hopefully it can be a starting place for a lot of people.

Thank you, abetanco, for providing the code, and DaveEv for cleaning and restructuring it. Can it also run on the 92600-3NG0A?

[abetanco]

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp control potentiometer, instrument gauge potentiometer, VW Golf preheater element relays, and LeafCAN read. Hopefully it can be a starting place for a lot of people.

Thank you, DaveEV! Your code looks great, thanks for cleaning it up. I'll get back to you in the next couple of days with some more details on my system, for your interest. I'll try and include some photos.

[abetanco]

Thanks! I just setup github account at https://github.com/RERides-EV. I've made some mods to your code. Goal is to create modules based on controller/device. I can then #include modules for each component I add to a build. For this build, in addition to the Leaf AC compressor, I plan to add temp control potentiometer, instrument gauge potentiometer, VW Golf preheater element relays, and LeafCAN read. Hopefully it can be a starting place for a lot of people.

Hi DaveEV,

I looked into it and remembered some more information. Pin 5 is connected to the "SLP" (sleep, I believe) input on the LIN Transceiver. There are four inputs to the LIN transceiver: Rx, SLP, Tx, and GND. The Tx and Rx connect to the Rx and Tx, respectively, on the Arduino. I believe Tx on the arduino is PIN 18, which goes into the Rx on the LIN transceiver. I believe Pin 7 is the on/off switch, as you surmised. I don't remember what the SLP pin on the LIN transceiver does, but I read something about it a while back, and whatever it was made me decide to connect a +5V output from the Arduino to the SLP pin. Does anyone out there know?

I hope this helps, and sorry it's not more definite. Let me know if you have any more questions.

Also, I found my full code, which connects to a 4-position switch (Off, low, medium, and high speed for the compressor). I had to do it this way initially, since I wasn't sure which speed would be best. It turned out that "medium" (these speeds are relative - the actual potential speed range is much more broad) was best in my case, which I think corresponds to:

buf[0] = 0xb3;
buf[1] = 0x08;
cksum = 0xb7;

This project took me four months of obsessive reading, experimenting, and repeating. Hopefully it works for you! Let me know if you have any more questions, or if you would like to see my complete code for my system. I can post photos in the next couple of days, with more details, if anyone is interested.

[DaveEV]

That's really helpful! I haven't hooked anything up, but it sounds like I'll need a LIN transceiver instead of straight to the compressor. That makes much more sense and I saw a couple models earlier in the chat

@maiks, I'm not sure about any of the compressors. I imagine the code supports both. If I remember, the two compressors that I have a use slightly different mounts to the motor and alignment of HV plug. I'll check the model numbers I have and test both.

[abetanco]

That's really helpful! I haven't hooked anything up, but it sounds like I'll need a LIN transceiver instead of straight to the compressor. That makes much more sense and I saw a couple models earlier in the chat

@maiks, I'm not sure about any of the compressors. I imagine the code supports both. If I remember, the two compressors that I have a use slightly different mounts to the motor and alignment of HV plug. I'll check the model numbers I have and test both.

Yes, I think the purpose of the LIN transceiver is to convert the two-wire UART signal to a single-wire LIN signal. I got mine on Amazon. I think it was close to $20.

Also, Some of the Leaf models use UART, some use LIN. I think the base models use UART. There is a great website with the manuals, I think I reference it somewhere above on the thread. The manuals cover both types of compressors.

[DaveEV]

That's really helpful. I didn't see the manual in this thread but I'll look elsewhere. I have the following models and will try to get both working. Nissan numbers are:
- 3NG0A: 4-wire (UART?) from 2014
- 5SA7B: 3-wire (LIN) from 2023

[abetanco]

Great work! I don't know, unfortunately, but I vaguely recall finding online that some similar compressors have an operating range of between 200 to 400 V DC. You could try checking out the service manuals, specifically the HA (Heater and Air Conditioning System) and HAC (Heater and Air Conditioning System Control) portions:
https://www.nicoclub.com/nissan-service-manuals

Otherwise, Mark Lines has some teardown reports that may be available free online.

Here is my previous post on where to find the manuals for the Nissan Leaf. Each subsystem within the vehicle has its own manual.

[m.art.y]

I have lots of these aircon units for sale in UK/EU from Leafs 2017 onwards if anybody interested. Comes with some hoses as well. PM if interested.

[PaulHeystee]

I have also about 20 units here in NL, for anyone who is interested.

[abetanco]

I've got a question for all on this thread. I noticed that the Nissan Leaf models without a heat pump do not have a direct LIN communication line to the compressor, but rather a "COMP_TX" and a "COMP_RX" to the compressor. These compressors are the Panasonic ones. It appears that the PTC Heater communicates directly, via LIN, to the A/C Auto Amp, which in turn communicates via two communication lines, one TX and one RX, to the compressor. So, it appears the A/C auto amp converts the LIN signal to a UART(?) signal that the compressor can understand. Does anyone know if the same LIN signals we've been discussing on this thread would work for the Panasonic Compressor? If so, how are these signals converted to the two-wire signal that the compressor understands? If not, any ideas?

[CraziFuzzy]

I'm not sure there's any sort of direct translation going on here. The AC Auto Amp, I think, is doing the actual climate control job (as well as other things), so it's simply controlling the heater and/or compressor as required/desired. I don't think there is any specific corrolation between the LIN commands previously posted and what the non-lin compressors 'speak.' This is likely a call for all new 'sniffing' to be done on those Tx/Rx lines.

I'm a new lurker here... actually not ready to do a full EV conversion - but am interested in using an EV AC compressor + battery pack for a different specific project (camper).