Because car OBD scanners use a standard 16-pin trapezoidal connector while motorcycles use brand-specific weather-pack plugs, technicians need reliable adapter cables. Here is the complete wiring master chart for Indian BS6 two-wheelers.
1 Standard 16-Pin OBD-II Female Pinout Reference
Every motorcycle diagnostic cable connects to these standard 16-pin scanner pins:
• Pin 4: Chassis Ground
• Pin 5: Signal Ground
• Pin 6: CAN High (CAN_H) — 2.5V to 3.5V DC
• Pin 7: ISO 9141 / KWP K-Line (Honda, Yamaha, Hero EFI)
• Pin 14: CAN Low (CAN_L) — 1.5V to 2.5V DC
• Pin 16: +12V Battery Constant Power (Fused)
2 Euro-5 6-Pin Pinout (Royal Enfield, TVS, KTM, Hero)
The red 6-pin connector (ISO 19689) is the standardized benchmark across modern Indian BS6 bikes:
| Euro-5 Pin # | Wire Function | Connects to 16-Pin OBD |
|---|---|---|
| Pin 1 | CAN High (CAN_H) | Pin 6 |
| Pin 2 | CAN Low (CAN_L) | Pin 14 |
| Pin 3 | K-Line (Optional) | Pin 7 |
| Pin 4 | Chassis Ground (GND) | Pin 4 & 5 |
| Pin 6 | +12V Constant Power | Pin 16 |
3 Honda Red 4-Pin Pinout (Activa 6G, 125, Shine, SP125, Unicorn)
Honda utilizes a dedicated red 4-pin waterproof coupler operating primarily on K-Line communication:
| Honda Pin # | Color Typical | Function | OBD Pin |
|---|---|---|---|
| Pin 1 | Orange / White | K-Line Diagnostic | Pin 7 |
| Pin 2 | Brown | SCS Service Check | Not Used |
| Pin 3 | Green / Black | Ground (Earth) | Pin 4 & 5 |
| Pin 4 | Red / Black | +12V Battery Power | Pin 16 |
4 Yamaha 3-Pin & 4-Pin Pinout (FZ, FZ-X, R15 V3/V4, MT-15, Aerox)
Yamaha models use white 3-pin or 4-pin couplers under the pillion seat:
• Red wire: +12V Power ➔ OBD Pin 16
• Black wire: Ground ➔ OBD Pin 4/5
• White / Yellow wire: CAN-High ➔ OBD Pin 6 (or K-Line Pin 7 on older 3-pin)
• White / Blue wire: CAN-Low ➔ OBD Pin 14
5 Bajaj 6-Pin Pinout (Pulsar 150/250, Dominar 250/400)
Bajaj uses a dedicated 6-pin harness near the ECU:
• Pin 1: CAN-H (Blue/White) ➔ OBD Pin 6
• Pin 2: CAN-L (White) ➔ OBD Pin 14
• Pin 3: Ground (Black/Yellow) ➔ OBD Pin 4/5
• Pin 4: +12V Fused Power (Brown) ➔ OBD Pin 16
6 60-Second Multimeter Continuity Test
Before plugging in a new adapter cable:
- Set digital multimeter to continuity beep mode.
- Touch one probe to OBD Pin 16 and verify beep at the adapter's +12V pin.
- Touch probe to OBD Pin 4/5 and verify beep at the Ground pin.
- Verify CAN-H and CAN-L pins are NOT shorted together.