Wiring Harness: Description and Operation

Vehicle Wiring Harness

The MINI wiring harness is referred to as a single piece harness. The main harness is vehicle specific depending on optional equipment. In addition there are three other modular harnesses which connect to the main body harness:

- Door harness (x 2).
- Dashboard harness.

Integral to the main body harness are the multiple restraint system (MRS) harness, the CAN-bus twisted wire pairs, the single wire K-bus data link and the single wire diagnostic line. Repairs may be made on most harnesses depending on extent of damage although no part of the MRS harness is repairable.

Principle of Operation
The Power Distribution system reacts to the vehicle demand for electrical power. Current from the battery is routed through the fuses and harnesses to the component demanding power. The battery smooths out voltage fluctuations allowing components to receive a fixed voltage level.

The generator reacts to power demands and battery voltage supplies operating current during times of high demand. The high capacity of the generator ensures that sufficient power is always available.

Circuit protection is afforded by the fuse system. Excess amperage demands either through defective component or wiring harness fault are quickly reduced to protect the vehicle. The battery location of the MINI COOPER S requires additional protection due to its long B+ battery cable. It is protected by a 250 amp fuse and the BST located in the battery compartment.