Signal specification, ABS / DSTC (dynamic stability and traction control) control module
All the values given are between the relevant terminal in column 1 and terminals #A15 or #A46 (ground), unless otherwise indicated in brackets.
NOTE:
It is important that the breakout box is connected and that the ground terminals have been checked before readings are taken.
| U = | DC voltage in volts (V) | Ubat = | battery voltage (V) | |
| I = | current in amperes (A) | Ulow = | voltage approximately 0 V | |
| f = | Frequency in Hertz (Hz) |
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Other |
| #A1 | #1 | Pressure build-up valve signal | Pulse width modulated signal I = Max 4 A F = 18 kHz |
- |
| #A2 | #2 | - | - | - |
| #A3 | #3 | Front right wheel sensor signal | Tooth against sensor: I ≈ 14 mA, U ≈ 9 V Cover against sensor: I ≈ 7 mA, U ≈ 10 V (at normal system voltage) |
The wheel sensors generate a current for the control module. When the pulse wheel rotates, the sensor generates a pulsed current (quadratic wave) where the strength of the current depends on the position of the pulse wheel. The frequency increases with speed. |
| #A4 | #4 | Power supply, rear right wheel sensor | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A5 | #5 | - | - | - |
| #A6 | #6 | Power supply, rear right wheel sensor | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A7 | #7 | Rear right wheel sensor signal | Tooth against sensor: I ≈ 14 mA, U ≈ 9 V Cover against sensor: I ≈ 7 mA, U ≈ 10 V (at normal system voltage) |
The wheel sensors generate a current for the control module. When the pulse wheel rotates, the sensor generates a pulsed current (quadratic wave) where the strength of the current depends on the position of the pulse wheel. The frequency increases with speed. |
| #A8 | #8 | - | - | - |
| #A9 | #9 | Signal ground, lateral acceleration sensor | U ≈ Ulow | - |
| #A10 | #10 | Brake pressure sensor 2 signal | Sensitivity: 230 mV/kPa (23 mV/bar) Operating range: 0 - 17 MPa (0 - 170 bar) (0.25 V - 4.75 V) Not pressured: 0.5 V |
- |
| #A11 | #11 | Signal ground, yaw rate sensor 1 | U ≈ Ulow | - |
| #A12 | #12 | Brake pressure sensor 1 signal | Sensitivity: 230 mV/kPa (23 mV/bar) Operating range: 0 - 17 MPa (0 - 170 bar) (0.25 V - 4.75 V) Not pressured: 0.5 V |
- |
| #A13 | #13 | Pedal pressure sensor signal | Brake pedal released: U ≈ 12 V DC Brake pedal released: F = 142.8 Hz |
The signal is measured to terminal #15. The control module transmits a pulsed test signal between 0 and 12 V to check the circuit. The terminal is tested when the brake pedal is depressed. |
| #A14 | #14 | Yaw rate sensor 2 signal | Sensitivity: 27.0 mV/°/s Operating range: +75°/s to -75°/s or (0.475 V to 4.525 V) 0° = 2.5 V Left turn: >2.50 V Right turn: <2.50 V |
- |
| #A15 | #15 | Power and signal ground (measured to battery negative terminal) | U ≈ Ulow | - |
| #A16 | #16 | 30-supply inlet and outlet valves (power supply from the battery to the intake and exhaust valves) | U ≈ Ubat | Power supply to the in and outlet valves and signal to the control module. |
| #A17 | #17 | Supply voltage pressure build-up valve | U = 4.75 - 5.25 V | - |
| #A18 | #18 | - | - | - |
| #A19 | #19 | Control modules communication cable (CAN H) | U = 2 - 3 V | - |
| #A20 | #20 | Control modules communication cable (CAN L) | U = 2 - 3 V | - |
| #A21 | #21 | - | - | - |
| #A22 | #22 | - | - | - |
| #A23 | #23 | Stop lamp switch signal | Open: U ≈ Ulow Closed: U ≈ Ubat |
The stop lamp switch closes when braking. |
| #A24 | #24 | - | - | - |
| #A25 | #25 | Lateral acceleration sensor supply voltage | U = 4.75 - 5.25 V | - |
| #A26 | #26 | Brake pressure sensor 2 signal ground | U ≈ Ulow | - |
| #A27 | #27 | Yaw rate sensor 2 power supply | U = 4.75 - 5.25 V | - |
| #A28 | #28 | Brake pressure sensor 1 signal ground | U ≈ Ulow | - |
| #A29 | #29 | Pedal pressure sensor signal | Brake pedal released: F = 142.8 Hz Brake pedal released: U ≈ 12 V DC |
The signal is measured to terminal #15. The control module transmits a pulsed test signal between 0 and 12 V to check the circuit. The terminal is tested when the brake pedal is unaffected. |
| #A30 | #30 | Signal ground, yaw rate sensor 2 | U ≈ Ulow | - |
| #A31 | #31 | - | - | - |
| #A32 | #32 | Voltage reading pedal pressure sensor | U ≈ Ubat | - |
| #A33 | #33 | Front left wheel sensor signal | Tooth against sensor: I ≈ 14 mA, U ≈ 9 V Cover against sensor: I ≈ 7 mA, U ≈ 10 V (at normal system voltage) |
The wheel sensors generate a current for the control module. When the pulse wheel rotates, the sensor generates a pulsed current (quadratic wave) where the strength of the current depends on the position of the pulse wheel. The frequency increases with speed. |
| #A34 | #34 | Front left wheel sensor power supply | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A35 | #35 | - | - | - |
| #A36 | #36 | Rear left wheel sensor power supply | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A37 | #37 | Rear left wheel sensor signal | Tooth against sensor: I ≈ 14 mA, U ≈ 9 V Cover against sensor: I ≈ 7 mA, U ≈ 10 V (at normal system voltage) |
The wheel sensors generate a current for the control module. When the pulse wheel rotates, the sensor generates a pulsed current (quadratic wave) where the strength of the current depends on the position of the pulse wheel. The frequency increases with speed. |
| #A38 | #38 | - | - | - |
| #A39 | #39 | - | - | - |
| #A40 | #40 | Lateral acceleration sensor signal | Sensitivity: 1.2 V/g Operating range: -1.7g to +1.7g (-1.7g = 4.75 V) (+1.7g = 0.25 V) (0g = 2.5 V) Left turn: <2.50 V Right turn: >2.50 V |
- |
| #A41 | #41 | Brake pressure sensor 2 power supply | U = 4.75 - 5.25 V | - |
| #A42 | #42 | Yaw rate sensor 1 signal | Sensitivity: 27.0 mV/°/s Operating range: +75°/s to -75°/s (0.475 V - 4.525 V) (0° = 2.5 V) Left turn: <2.50 V Right turn: >2.50 V |
- |
| #A43 | #43 | Brake pressure sensor 1 power supply | U = 4.75 - 5.25 V | - |
| #A44 | #44 | 15-supply (power supply from the ignition switch) | U = Ubat | - |
| #A45 | #45 | Yaw rate sensor 1 power supply | U = 4.75-5.25 V | - |
| #A46 | #46 | Power and signal ground | U = Ulow | - |
| #A47 | #47 | 30-supply pump motor (power supply from the battery) | U = Ubat | - |