Signal Specification, Trailer Module (TRM)
General
All the values given below are between the respective terminal (column 1) and power ground (#C2:4). If this is not the case, it is indicated within brackets.
NOTE:
It is important to connect the breakout box and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | UAC = | AC voltage in volts (V) |
| Ubat = | Battery voltage in volts (V) | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | t = | Time in seconds (s) |
| PWM = | Pulse width modulated signal in % |
CONNECTOR C1
| Breakout box terminal | Control module terminal | Signal type | Ignition off | Ignition on | Miscellaneous |
|---|---|---|---|---|---|
| #31 | #C1:1 | - | - | - | - |
| #32 | #C1:2 | Power supply, trailer module (TRM), 30-supply | U = Ubat | U = Ubat | - |
CONNECTOR C2
| Breakout box terminal | Control module terminal | Signal type | Ignition off | Ignition on | Miscellaneous |
|---|---|---|---|---|---|
| #22 | #C2:1 | CAN H | U = Ulow | During communication: U = 2.5 - 4.0 V | - |
| #23 | #C2:2 | CAN L | U = Ulow | During communication: U = 1.0 - 2.5 V | - |
| #24 | #C2:3 | Input signal brake lamp | During activation: U = Ubat | During activation: U = Ubat | From the central electronic module (CEM) via the vehicle's left-hand tail lamp |
| #25 | #C2:4 | Power ground | Ulow | Ulow | - |
| #26 | #C2:5 | - | - | - | - |
CONNECTOR C3
| Breakout box terminal | Control module terminal | Signal type | Ignition off | Ignition on | Miscellaneous |
|---|---|---|---|---|---|
| - | #C3:1 | Back-up lamp | U = Ulow | During activation U = Ubat |
USA: only on 4-pin/7-pin, not on 4-pin |
| - | #C3:2 | Not connected | - | - | - |
| - | #C3:3 | Floating = not measurable | - | - | - |
| - | #C3:4 | - | - | - | - |
| - | #C3:5 | Charging (+12V) activated by ignition relay | - | During activation: U = Ubat | Active in ignition position II and III. |
| - | #C3:6 | Permanent power supply (+12V) (certain vehicle only) | U = Ubat | U = Ubat | - |
| - | #C3:7 | Parking lamps right | U = Ulow | During activation: U = Ubat | USA: parking lamps R + L |
| - | #C3:8 | Parking lamps left | - | - | USA: parking lamps R + L |
| - | #C3:9 | Right turn signal lamp | Normal: U = Ulow Upon activation of hazard warning lamps: U = Ubat |
During activation and normal function: f = 1, 5 Hz, PWM = 50 % | USA: indicators and brake lamp right |
| - | #C3:10 | Left turn signal lamp | Normal: U = Ulow Upon activation of hazard warning lamps: U = Ubat |
During activation and normal function: f = 1, 5 Hz, PWM = 50 % | USA: indicators and brake lamp left |
| - | #C3:11 | Brake light | U = Ulow | During activation: U = Ubat | - |
| - | #C3:12 | Fog lamps | U = Ulow | During activation: U = Ubat | USA: not connected |