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Main fuse boxes

Main fuse boxes

Cars with diesel engines have three main fuses boxes while cars with petrol engines have four. The three main fuses boxes 342, 22 and 701 are connected to the wiring harness via connectors while the others are integrated in the wiring harness.

The main fuse boxes contain all of the vehicle's fuses and relays except fuel pump relay 102. This relay is mounted in the cabin under the right A-pillar.

The engine bay contains


• Electrical centre 342 (UEC)

• B207: Fuse box, engine management system (727), E39

• B284: Main fuse box 727

• B284: Fuse holder, radiator fans, B284 (748)

• Z18XE: Fuse holder, power steering (746)

• Z19: Fuse holder, power steering/glow plug (746a) ,

• Z19: Fuse holder, radiator fans, diesel (748)


Main fuse box 342 contains relays, maxi and microfuses as well as a control module with logic functions for the front section of the car.

Fuse box, engine management system petrol 727 contains relays, maxi and micro fuses for E39 engine management system.

Fuse holder 746 contains a maxi fuse for electro-hydraulic power steering.

Fuse holder 746a contains blade type maxi fuses for the electro-hydraulic power steering and the glow plugs in cars with diesel engines.

Fuse holder 748 contains blade-type maxi fuses for the radiator fans in diesel-engined cars and V6 petrol-engined cars.

The dashboard contains


• Electrical centre 22 (IPEC)


Main fuse box 22 contains relays as well as maxi and microfuses for functions in the cabin and the dashboard.

The BCM control module is mounted on the main fuse box.

The luggage compartment contains


• Electrical centre 701 (REC)


Main fuse box 701 contains relays, maxi and microfuses as well as a control module with logic functions for the rear section of the car.