Signal Description
All the values given below are between the relevant terminal stated in column 1 and terminal #A16 or #A47 (ground) unless otherwise stated in parenthesis after the table entry.
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) | U bat = | battery voltage (V) |
| I = | current in amperes (A) | U low = | voltage approximately 0 V |
| F = | Frequency in Hertz (Hz) | - | - |
| Breakout box terminal | Terminal Control module | Signal type | Ignition on | Miscellaneous |
| #A1 | #1 | 30-feed pump motor (power supply from battery) | U = Ubat | Fused with 30 A From 2008- Fused with 40 A |
| #A2 | #2 | Reserve | - | - |
| #A3 | #3 | Reserve | - | - |
| #A4 | #4 | Reserve | - | - |
| #A5 | #5 | Vacuum sensor, power supply | U = 5 V | - |
| #A6 | #6 | Reserve | - | - |
| #A7 | #7 | Wheel sensor right rear, signal output | Tooth against sensor: U≈ Ulow Cover at sensor U≈ Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 1 KΩ and #7. Connect a voltmeter between #7 and ground connection #16. Turn the wheel slowly. |
| #A8 | #8 | 15-supply (power supply from ignition) | U = Ubat | - |
| #A9 | #9 | Wheel sensor left rear, signal output. | Tooth against sensor: U≈ Ulow Cover against sensor: U≈ Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 1kΩ and #9. Connect a voltmeter between #9 and ground connection #16. Turn the wheel slowly. |
| #A10 | #10 | Reserve | - | - |
| #A11 | #11 | Wheel sensor right front, signal output. | Tooth at sensor U≈ Ulow Cover against sensor: U≈ Ubat |
Measure be creating a temporary voltage supply between #1 via a resistance of 1 KΩ and #11. Connect a voltmeter between #11 and ground connection #16. Turn the wheel slowly. |
| #A12 | #12 | Communication cable CAN H | U= 2-3 V | - |
| #A13 | #13 | Communication cable CAN L | U= 2-3 V | - |
| #A14 | #14 | Wheel sensor left front, signal output. | Tooth against sensor: U≈ U low Cover against sensor: U≈ U bat |
Measure by creating a temporary voltage supply between #1 via a resistance of 1 kΩ and #14. Connect a voltmeter between #14 and ground connection #16. Turn the wheel slowly. |
| #A15 | #15 | Reserve | - | - |
| #A16 | #16 | Power and signal ground | U= Ulow | Ground terminal for the input and outlet valves and signal to the control module. |
| #A17 | #17 | Pressure build-up valve, power supply. | U= 12 V | Pulse width modulated signal (PWM) max 4 A and 18 Hz. |
| #A18 | #18 | Body sensor cluster stability sensor (BSC), communication cable CAN H. | U= 2-3 V | - |
| #A19 | #19 | Body sensor cluster stability sensor (BSC), communication cable CAN L. | U= 2-3 V | - |
| #A20 | #20 | Reserve | - | - |
| #A21 | #21 | Pressure build-up valve, power supply | U= Ubat | - |
| #A22 | #22 | Body sensor cluster stability sensor (BSC), power supply | U= Ubat | The stability sensor is powered by the control module. |
| #A23 | #23 | Pedal pressure sensor, signal 1 | Open: U= Ulow | The sensor is normally open. 0 V when the brake pedal is not actuated. 12 V when the brake pedal is actuated. |
| #A24 | #24 | Pedal pressure sensor, signal 2 | Closed: U= Ubat | The sensor is normally closed. 12 V when the brake pedal is not actuated. 0 V when the brake pedal is actuated. |
| #A25 | #25 | Reserve | - | - |
| #A26 | #26 | Pedal position sensor, power supply | U= 5 V | - |
| #A27 | #27 | Pedal position sensor, ground | U= Ulow | - |
| #A28 | #28 | Reserve | - | - |
| #A29 | #29 | Stability sensor, ground | U= U Ulow | - |
| #A30 | #30 | Vacuum sensor signal | U= 5 V | - |
| #A31 | #31 | Check valve, signal | - | Pulse width modulated signal (PWM) 5-10 A. |
| #A32 | #32 | 30-feed for the valves (power supply from battery) | U = Ubat | With a 30 A fuse. |
| #A33 | #33 | Front right wheel sensor, ground | U= Ulow | - |
| #A34 | #34 | Front right wheel sensor, signal | Tooth against sensor: I ≈ 14 mA ± 25% Cover against sensor: I ≈ 7 mA ± 25% |
When the toothed wheels rotate, the sensor generates a pulsed current signal (square wave) with fixed pulse ratio. The frequency increases with speed. For test of sensor's function, see #11 in table. |
| #A35 | #35 | Reserve | - | - |
| #A36 | #36 | Rear left wheel sensor, signal | Tooth at sensor: I ≈ 14 mA ± 25% Cover against sensor: I ≈ 7 mA ± 25% |
The sensor generates a pulsed signal (square wave) with a fixed pulse ratio when the toothed wheel rotates. The frequency increases with speed. For test of sensor's function, see #9 in table. |
| #A37 | #37 | Rear left wheel sensor, ground | U= Ulow | - |
| #A38 | #38 | Pedal position sensor, signal | 0.25-4.75 V | The value increases when the brake pedal is depressed. |
| #A39 | #39 | Reserve | - | - |
| #A40 | #40 | Vacuum sensor, ground | U= Ulow | - |
| #A41 | #41 | Vacuum sensor, signal 1 | U= Ubat | - |
| #A42 | #42 | Rear right wheel sensor, ground | U= Ulow | - |
| #A43 | #43 | Rear right wheel sensor, signal | Tooth against sensor: I ≈ 14 mA ± 25% Cover against sensor: I ≈ 7 mA ± 25% |
The sensor generates a pulsed signal (square wave) with a fixed pulse ratio when the toothed wheel rotates. The frequency increases with speed. For test of sensor's function, see #7 in table. |
| #A44 | #44 | Reserve | - | - |
| #A45 | #45 | Front left wheel sensor, signal | Tooth against sensor: I ≈ 14 mA ± 25% Cover against sensor: I ≈ 7 mA ± 25% |
The sensor generates a pulsed signal (quadratic wave) with a fixed pulse ratio when the pulse wheel rotates. The frequency increases with speed. For test of sensor's function, see #14 in table. |
| #A46 | #46 | Front left wheel sensor, ground | U= U low | - |
| #A47 | #47 | Power and signal ground | U= U low | Ground terminal for the pump motor. |