Ground Circuits
MCU is grounded through pins No. 2, 14, 19 and 24. Pins No. 2, 14 and 24 are Brown wires. Pin No. 19 is Brown/Orange wire. Ground point is on right front shock tower. Ensure battery voltage exists between battery and pins No. 2, 14, 19 and 24. If voltage does not exist, check for open circuit. See WIRING DIAGRAMS article for more information.
MCU LOCATION
| Application | Location |
|---|---|
| 325 Series & 735i | Under Right Side of Dash |
| 525i & 535i | Behind Right Front Strut Tower |