E9X (Trailer Module)
| 1 | Indicator lamp (LED) |
| LED off | System not operable |
| Green LED lights up | System OK; The trailer tow hitch is in locked end position |
| The green LED flashes (2 Hz) | Trailer or adapter plugged in |
| The red LED flashes (2 Hz) | The trailer tow hitch is not in the locked end position. (trailer tow hitch is in intermediate setting) |
| Red LED lights up | Undervoltage or. overvoltage detected; < 9V or > 16V |
| The red LED flashes (4 Hz) | Control unit not initialized |
| Orange LED lights up or flashes green/orange or red/orange | Control unit faulty |
Summary, indicator lamp function indicator light (LED)