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2010 S80 Fan Relay Schematic

Help, Advice, Owners' Discussion and DIY Tutorials on the third generation Volvo V70 wagon and XC70 crossover, and second generation S80. Are you an owner? Prospective owner? Get in here and join us! Start a new topic or comment on an existing thread.

2008-2016 V70
2008-2016 XC70
2007-2016 S80

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Year and Model: 2000 S80
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2010 S80 Fan Relay Schematic

Post by adamkhan » Sat Aug 10, 2019 12:32 am

Hi, does anyone have a schematic or diagram of the Radiator Fan Relay Circuit? I replace my relay after it was stuck in the on position and drained my battery. I replaced it with the cheap $30 one off amazon and it was only turning the fan on very momentarily. The second one I installed worked great for 2 days then quit. I'd like to wire in heavy duty 5 blade 30 amp relays, 1 for each fan. Has anyone decoded or reverse engineered the circuit? There's only 3 wires coming into the relay; Positive, Negative & signal but it controls both fans independently. Some Magic happens inside!!

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Re: 2010 S80 Fan Relay Schematic

Post by RickHaleParker » Sun Aug 11, 2019 4:56 pm

The 2010 S80 does not have a Cooling Fan Relay. It has a Cooling Fan Control Module. Which is located on the cooling fan. The third wire is a communication bus, the ECM sends commands down that buss to the Cooling Fan Control Module.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Platform P2 2004 S60R, B2524T4, AW50/51 AWD, B8444S TF80 AWD, Bosch Motronic 7.0, BorgWarner K24 turbocharger. V8 conversion in progress.

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