P0482

P0482 sets on cooling fan relay 3 control circuit -- only present on vehicles with three-stage fan control (low/medium/high) or on dual-fan setups where a third relay handles series/parallel switching for variable fan speed. These three-relay systems are most common on European platforms, Chrysler/Jeep TIPM-equipped vehicles, and some GM trucks with heavy-duty cooling packages. Cheapest first, same as P0480/P0481: identify relay 3 in the under-hood fuse box (the diagram on the lid labels them, or the FSM wiring section will), pull it, inspect for melted terminals or burnt smell, and swap with an identical-part-number relay. The micro-relay used for fan stages is almost always cross-compatible with the horn relay and the A/C clutch relay on the same vehicle -- you can isolate which side of the circuit is faulty in 5 minutes with no parts purchase. If swap doesn't clear, back-probe the relay socket coil pins for 12V feed and PCM-side switching. Caveat: three-stage fan systems usually employ a dropping resistor pack (or a series/parallel coil configuration on some Chrysler/Mercedes platforms) and that resistor pack burns out before the relays do -- a code that points at relay 3 sometimes points at the upstream resistor pack that feeds relay 3's load circuit, so verify the resistor pack is intact before condemning the relay or the PCM driver.

Vehicle-specific patterns: 2005-2010 Chrysler 300 / Dodge Charger 5.7L Hemi -- TIPM internal fan relay 3 driver fails along with the entire fan control section, Chrysler TSB 08-001-15 covers TIPM replacement. 2006-2011 Mercedes-Benz E-Class W211 M272 -- fan resistor pack (series resistor on the fan motor) burns open, sets P0482 even though the relay itself is fine. 2007-2013 Jeep Wrangler JK 3.8L -- TIPM cooling fan stage 3 control fails, mopar reman TIPM is the only listed fix. 2008-2014 BMW 3-Series E90 N52 -- electric fan module (integrated controller and motor) internal MOSFET fails, sets P0482 on stage 3 command, full fan-and-controller assembly replacement. Estimated repair: $25 to $850.