S40 V40: - V40 2003 heated seat SHM retrofit

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S40 V40: V40 2003 heated seat SHM retrofit

S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004.

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Dec 29th, 2023, 17:38	#1
KiKiHUN New Member Last Online: Dec 29th, 2023 17:38 Join Date: Dec 2023 Location: Kőszeg	V40 2003 heated seat SHM retrofit Hi everyone. I just got an offical heating element for the seats.(V40 2003) My car does not wired up for the heated seat but i think i can do it easily. The fuse box has the fuse for it. The CCM does send data on the 9 and 10 pin using lin bus. All i need is some information about the driving of the heated seats. Are they just wired up in series and achieve 50w of heating or are they controlled separate by the SHM ((25w+90w)=115w)? And the second question but i don't think it is needed, does the CCM wants data back? As far as i can see, the button led is not turning off, and the data stream for the temperature always comes. My plan is to control the whole thing with a relay+atmega chip+ lin bus converter

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