Signal Specification
Connector A, terminals #A1-#A22
All values given below are between the respective terminal in column 1 and terminal #A13 (signal ground). If this is not the case it is indicated in parentheses.
NOTE:
It is important to connect the breakout box and check ground terminals before reading off.
| U= | DC voltage in volts (V) | UAC = | Alternating current in volts (V) |
| Ubat = | Battery voltage | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | %duty = | Duty cycle (pulse ratio) as a percentage (%) |
| t = | Time in milliseconds (ms) |
| Terminal in the breakout box | Terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| 31 | #A1 | Washer reservoir level | Lamp lit: U= 2 V Lamp not lit: U = 10 - Ubat |
Lamp lit: U= 2 V Lamp not lit: U = 10 - Ubat |
- |
| 32 | #A2 | ABS warning lamp | Lamp lit: U = 6-8 V Lamp not lit: U = Ulow |
Lamp lit: U = 7-10 V Lamp not lit: U = Ulow |
- |
| 33 | #A3 | Program selector signal "B" | Low: U = Ulow
with the switch in position for: - Speed warning - Average speed - Outside temperature - Mileage U=10-12 V in other positions |
When the switch is disengaged: U=10-12 V | |
| 34 | #A4 | Left turn signal lamp | Lamp not lit: U = Ulow Lamp lit: U = 8-12 V |
Lamp not lit: U = Ulow Lamp lit: U = 8-14 V |
- |
| 35 | #A5 | Program selector, signal "C" | Low: U = Ulow
with the switch in position for: - Speed warning - Average speed - Present fuel consumption Average fuel consumption U=10-12 V in other positions |
When the switch is disengaged: U=10-12 V | |
| 36 | #A6 | Program selector, signal "A" | Low: U = Ulow
with the switch in position for: - Speed warning - Present fuel consumption - Outside temperature - Range to empty fuel tank U=10-12 V in other positions |
When the switch is disengaged: U=10-12 V | |
| 37 | #A7 | Right turn signal lamp | Lamp not lit: U = Ulow Lamp lit: U = 8-12 V |
Lamp not lit: U = Ulow Lamp lit: U = 8-14 V |
- |
| 38 | #A8 | Spare lamp | Not used | Not used | - |
| 39 | #A9 | Rheostat | U≈2 V (rheostat min) U ≈ 10 -12 V (rheostat max) |
U≈2.3 V (rheostat min) U ≈Ubat (rheostat max) |
- |
| 40 | #A10 | Battery voltage 30+ | U = Ubat | U = Ubat | - |
| 41 | #A11 | Trip computer reset button | Not pressed: U=10-12 V Pressed: U=Ulow |
- | |
| 42 | #A12 | Outside temperature (-) | U = Ulow | U = Ulow | - |
| 43 | #A13 | Signal ground 31- | U = Ulow | U = Ulow | - |
| 44 | #A14 | Front fog lamp bulb | Lamp not lit: U = Ulow Lamp lit: U = 10-12 V |
Lamp not lit: U = Ulow Lamp lit: U = 12-14 V |
- |
| 45 | #A15 | Trailer | Lamp lit: U = Ubat |
Lamp lit: U = Ubat |
- |
| 46 | #A16 | Fog tail lamps | Lamp not lit: U = Ulow Lamp lit: U = 10-12 V |
Lamp not lit: U = Ulow Lamp lit: U = 12-14 V |
- |
| 47 | #A17 | Battery voltage 15+ | U = Ubat | U = Ubat | - |
| 48 | #A18 | Cruise control | Lamp lit: U = Ubat |
Lamp lit: U = Ubat |
- |
| 49 | #A19 | Outside temperature (+) | Infocenter and alternative: -40 °C ≈ 4.9 V -20 °C ≈ 4.2 V -10 °C ≈ 3.8V -5 °C ≈ 3.5 V 0 °C ≈ 3.25 V 3 °C ≈ 3.0 V 5 °C ≈ 2.9 V 10 °C ≈ 2.65 V 20 °C ≈ 2.15 V 30 °C ≈ 1.65 V 40 °C ≈ 1.3 V 50 °C ≈ 1.0 V Without infocenter: U = Ulow |
Without infocenter: U = Ulow | Voltage increases linearly with falling temperature. Measured to A12 (ground). The lamp is permanently lit between +3 °C and -5 °C. The lamp is lit for 30 seconds if the temperature is lower than -5 °C. The lamp is unlit if the temperature is higher than +5 °C. |
| 50 | #A20 | High beam | Off: U = Ulow On: U = Ubat |
Off: U = Ulow On: U = Ubat |
- |
| 51 | #A21 | - | - | - | - |
| 52 | #A22 | Warning | Lamp not lit: U = Ulow Lamp lit: U = 9 - 11 V |
Lamp not lit: U = Ulow Lamp lit: U = 9 - Ubat |
- |
Connector B, terminals #B1-#B30
All values given below are between the respective terminal in column 1 and terminal #A13 (signal ground). If this is not the case it is indicated in parentheses.
NOTE:
It is important to connect the breakout box and check ground terminals before reading off.
| U= | DC voltage in volts (V) | UAC = | Alternating current in volts (V) |
| Ubat = | Battery voltage | f = | Frequency in Hertz (Hz) |
| Ulow = | Voltage approximately 0 V | %duty = | Duty cycle (pulse ratio) as a percentage (%) |
| t = | Time in milliseconds (ms) |
| Terminal in the breakout box | Terminal | Signal type | Ignition on | Engine idling | Other |
|---|---|---|---|---|---|
| 1 | #B1 | High beam | Off: U = Ubat On: U = Ulow |
Off: U = Ubat On: U = Ulow |
- |
| 2 | #B2 | Door switch | Closed door: U = 10-12 V Door open U = Ulow |
Closed door: U = 12-14 V Door open: U = Ulow |
- |
| 3 | #B3 | Diagnostic lead | U ≈ 9 -11 V | U ≈ 9 -11 V | - |
| 4 | #B4 | Output signal, vehicle speed signal to radio | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | - |
| 5 | #B5 | Fuel consumption signal | U = Ulow | f = 3-6 Hz Without infocenter: U = Ulow |
Only trip computer |
| 6 | #B6 | Malfunction indicator lamp (MIL) | Lamp on: U = Ulow |
Lamp on: U = Ulow |
The lamp is lit in winter. The lamp flashes when there is a fault in the automatic transmission. |
| 7 | #B7 | Engine speed signal (RPM) | U = Ulow - 9 V | U= 9V f = 20-30 Hz |
For Melco2 systems, the engine speed (RPM) signal comes directly from the ignition sensor for the engine management system |
| 8 | #B8 | Three-way catalytic converter (TWC) temperature | Lamp lit: U = Ulow Lamp not lit: U = 12-14 V |
Lamp lit: U = Ulow Lamp not lit: U = 12-14 V |
- |
| 9 | #B9 | Fuel level | U = 0 - 5 V, depending on the fuel level |
U = 0 - 5 V, depending on the fuel level |
(measured to B17) |
| 10 | #B10 | Engine coolant temperature (ECT) | f = 45 Hz at +25°C f = 20 Hz at +100°C |
f = 45 Hz at +25°C f = 20 Hz at +100°C |
A pulsed signal between 0 V and 5 V with variable frequency and fixed pulse ratio (% duty). The frequency increases with decreasing temperature. |
| 11 | #B11 | SRS system | Lamp lit: U ≈ 6 -8 V Lamp not lit: U = Ulow -2 V |
U ≈ 7 - 9 V | - |
| 12 | #B12 | Signal at high temperature | Lamp lit: U = Ulow Lamp not lit: U = Ubat Gasoline driven cars: U = Ulow |
Lamp lit: U = Ulow Lamp not lit: U = Ubat Gasoline driven cars: U = Ulow |
The connector is grounded when the diesel engine temperature is >120 °C |
| 13 | #B13 | Battery charging | U = Ulow | U = 13 -14 V, | When the lamp is ON the low fuel level, the temperature too high LED and the brake fluid lamp light up. |
| 14 | #B14 | Brake fluid level sensor | U = 0 - 5 V, | U = Ubat Lamp not lit: |
- |
| 15 | #B15 | Speed output signal | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | - |
| 16 | #B16 | Speedometer input signal | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | U = Ulow or 9 - Ubat (depending on the position of the right front wheel) | - |
| 17 | #B17 | Signal ground for fuel level and coolant temperature sensor | U = Ulow | U = Ulow | The engine coolant temperature (ECT) for diesel is not grounded via terminal #B17. |
| 18 | #B18 | Bulb failure warning sensor | Lamp not lit: U = Ubat Lamp lit U = Ulow |
Lamp not lit: U = Ubat Lamp lit U = Ulow |
- |
| 19 | #B19 | Parking brake | Engaged: U = Ulow Disengaged: U = Ubat |
Engaged: U = Ulow Disengaged: U = Ubat |
- |
| 20 | #B20 | Oil pressure sensor | Lamp lit: U = Ulow |
Lamp not lit: U = Ubat |
- |
| 21 | #B21 | Seat belt | Lamp lit: U = 12 - 14 Vbat Lamp not lit U = Ulow |
Lamp lit: U = 12 - 14 Vbat Lamp not lit U = Ulow |
Lamp flashes (f = 3 Hz). |
| 22 | #B22 | Spin or glow system | Lamp not lit: U = Ubat Lamp lit U = Ulow |
Lamp not lit: U = Ubat Lamp lit U = Ulow |
Spin for gasoline engines Glow for diesel engines. |
| 23 | #B23 | Malfunction indicator lamp (MIL) | Lamp not lit: U = Ubat Lamp lit U = Ulow |
Lamp not lit: U = Ubat Lamp lit U = Ulow |
- |
| 24 | #B24 | Immobilizer warning lamp | Lamp lit: U = Ulow |
Lamp lit: U = Ulow |
- |
| 25 | #B25 | ||||
| 26 | #B26 | ||||
| 27 | #B27 | ||||
| 28 | #B28 | ||||
| 29 | #B29 | ||||
| 30 | #B30 |