BMW Engine Electronics Fuse Pack – In Underhood E-Box, E46, E39, E38, X5 Etc
The Engine Electronics Fuse Pack supplies power to many of the engine operating systems. The pack is located in the under-hood E-Box (Electronics Box). Some models have the E-Box on the driver’s side and some are on the passenger side. The E-Box on the E46 3-series is located at the rear of the driver’s side of the engine compartment. The Bentley repair manuals lists all of the functions that are powered through these five fuses (Page 610-3 in the E46 manual).
Some of the functions covered by the fuse pack include:
Engine management main relay and most of the engine management systems (coils, fuel pump, fuel injectors, evaporative system, secondary air system, VANOS solenoid, resonance valve, idle control valve, thermostat, oxygen sensors, etc.) and the A/C compressor clutch relay.
The fuses are standard spade-type fuses and can be replaced individually once the pack is removed and opened up.
Here’s how to access the fuse pack and replace the individual fuses (photos shown on E46 3-Series chassis):