A detail wiring diagram of BMW certain control module will help a lot in accessing and troubleshooting control unit. BMW ICOM ISTA-D ISTA-P engineering software will make things easier.
What you need:
WIFI BMW ICOM A2+B+C diagnostic tool hardware
BMW ICOM software HDD (ISTA-D 3.46.30 ISTA-P 54.2.002 )
A laptop running Win 7 O/S
Well install BMW ICOM ISTA/D ISTA/P with engineering and developing software on laptop
Setup ICOM A, B and C and then connect BMW ICOM A2+B+C diagnostic system with
Run BMW ICOM software HDD
Click “Product structure” Tab to select specific module, Drive control unit for example
Click on “SSP Steering wheel heater” option, press “Display” button on the right button corner
The BMW ICOM ISTA-D ISTA-P software HDD program will display the wiring diagram of the control unit you selected previously
Click on each component, you are able to view the detail wiring diagram of specific part of your vehicle
Press the magnifying icon, the wiring diagram will display in larger screen.