BMW X3 Service & Repair Manual: Engine compartment

Power Distribution Box (Z4) has the following consumers:

• Electric Auxiliary Heater
• Electric Fan
• Electronic Power Steering (EPS)
• Dynamic Stability Control (DSC) Return Pump
• Fuse U2: Supply Voltage For Electric Fan
• Fuse U3: Supply Voltage For DSC Return Pump
• Fuse U4: Supply Voltage For Electric Auxiliary Heater

NOTE: Power Distribution Box Z8 (Fuse block on the battery ) contains fuses and relays. If one of the fuses or one of the relays is faulty, the complete power distribution box must be replaced.

Power Distribution Box (Z8) has the following consumers:

• Power distribution box at front in the junction box (passenger compartment)
• Power distribution box, rear (luggage compartment)
• Electronics box in engine compartment for Valvetronic, common rail (fuel injection for diesel fuel)
• Top HiFi amplifier
• Intelligent battery sensor (IBS)