Btune Posted December 26, 2023 Report Share Posted December 26, 2023 Hey Guys im having some issues getting the AC Request from a BMW E90. I got some info from the interwebs and so far this is what ive got. CANID in dec 726 Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 28, 2023 Report Share Posted December 28, 2023 You would need a start position of 15 and a width of 1 to pick up the 252/253 change in your pic. Also, make sure you have the receive filter at the top selected when you are in the "add parameters" selection screen. Quote Link to comment Share on other sites More sharing options...
Btune Posted January 2 Author Report Share Posted January 2 Thanks for the response Adam. No success yet. Any difference if its LS First? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 2 Report Share Posted January 2 10 hours ago, Btune said: Any difference if its LS First? No, ecu setup would be the same and LS/MS first would work the same since we are only looking at a single bit. Most likely the CAN info you have is not actually the AC request - it may just be something related to AC such as the blower is on or a clutch status etc. You will really need a sniffer to confirm. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 2 Report Share Posted January 2 I've been sniffing my E82 and looking into making a CAN mode, can check what info I have for that when I get back to work. Quote Link to comment Share on other sites More sharing options...
Btune Posted January 9 Author Report Share Posted January 9 I will be getting a sniffer and check whats going on over there. Hey Vaughan, that would be of great help. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 9 Report Share Posted January 9 Just had a look at my documentation and I don't have ac request mentioned anywhere in it yet. Interestingly though I haven't seen ID 0x2D6 (726 in decimal) in the CAN from my vehicle or in any of the documentation I have read, are you able to share your source? Quote Link to comment Share on other sites More sharing options...
Btune Posted January 9 Author Report Share Posted January 9 https://www.loopybunny.co.uk/CarPC/k_can.html Quote Link to comment Share on other sites More sharing options...
Vaughan Posted January 9 Report Share Posted January 9 31 minutes ago, Btune said: https://www.loopybunny.co.uk/CarPC/k_can.html I had seen that one, one thing to be aware of is that hasn't necessarily been scoped from the ECU pins, good chance it was scoped at the OBD2 plug and so will see different messages to the ECU. One thing you could do while you wait for your sniffer is feed full bytes or even pairs of bytes into CAN Analogs, this would mean if the CAN Analogs show anything other than 0 you have received a message on that ID and you can then also see what the values are with AC on and off to narrow it down if you are receiving messages on that CAN Id. As a side note I'm not seeing anything in the ECU pinout that says it controls the AC Clutch so I wouldn't be surprised if it doesn't get that particular message but rather gets an AC Clutch on message from the body computer. Quote Link to comment Share on other sites More sharing options...
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