Relay Box: Description and Operation

Power Distribution
The power distribution box for the E38 is incorporated in the Electronics box in the engine compartment.




The power distribution box for the E39 and E53 is inside the vehicle. The main fuse box is located inside the glove box above a hinged panel.

A "pull out" fuse designation card is also located in the fusebox. This notes:
- Fuse value in amps
- Location
- Circuit listing by fuse







The placement of the power distribution box is close to the main electronics carrier behind the glove box. The modules/relays located in the electronics carrier include (examples):
- General Module III (GM III)
- Drive away protection (EWS II)
- Anti-lock Brake (ABS/ASC+T)
- Light Check Module (LCM) - behind right kick panel
- Overload protection relay module




An auxiliary fuse block is located in the trunk above the battery. In addition to fuses, the auxiliary fuse block also contains relays (examples):
- Fuel filler flap lock motor relay
- Fuel pump relay (some vehicles)
- Rear defroster relay
- Unloader relay

Fused Power Distribution Centers
The E38, E39 and E53 utilize high amperage fused power distribution centers.




The E38 and E39 locations are found under the carpet on the passenger's side floor and in the right rear area of the trunk, forward of the battery.




The X5 utilizes a single high amperage fused power distribution center located next to the left side EHC air reservoir beneath the cargo area floor paneling.