Wiring Reference
Wiring Reference
Section titled “Wiring Reference”BMW Standard Wire Color Codes
Section titled “BMW Standard Wire Color Codes”BMW uses a consistent wire color coding system across models:
| Color | Abbreviation | Typical Use |
|---|---|---|
| Red | RT | Ignition-switched power (KL15) |
| Green | GN | Battery-direct power (KL30) |
| Brown | BR | Ground |
| Blue | BL | Signal/data wires |
| Yellow | GE | Lighting circuits |
| White | WS | Various signals |
| Gray | GR | CAN-bus high |
| Black | SW | CAN-bus low, ground |
| Violet | VI | Sensor signals |
CAN-Bus System
Section titled “CAN-Bus System”The E46 uses K-Bus (body) and D-Bus (diagnostic) networks:
- K-Bus: Body electronics (doors, windows, IHKA, radio) — single wire
- D-Bus: Diagnostic communication — OBD-II port
- PT-CAN (later models): Powertrain CAN for DME/transmission
OBD-II Pin-Out
Section titled “OBD-II Pin-Out”| Pin | Function |
|---|---|
| 2 | J1850 Bus+ |
| 4 | Chassis Ground |
| 5 | Signal Ground |
| 6 | CAN High (ISO 15765) |
| 7 | K-Line (ISO 9141-2) |
| 8 | K-Line (BMW specific) |
| 14 | CAN Low (ISO 15765) |
| 16 | Battery Power |