Signal specification, brake control module (BCM) with STC/ TRACS
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Volvo V70, 2006 Volvo V70, 2005 Volvo V70, 2004 Volvo V70, and 2003 Volvo V70. However, it is still accessible from the selected car via links, so may be relevant.
All values given are between the relevant terminal in column 1 and terminal #A16 or #A47 (ground), unless otherwise indicated in brackets.
Pins 6, 9, 13, 17-31, 35, 38-41 and 44 are not used.
NOTE:
It is important that the breakout box is connected and that the ground connections have been checked before starting to measure.
| 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 | Terminal ECU | Signal type | Ignition on | Miscellaneous |
| #A1 | #1 | Pump motor, 30-supply (power supply from the battery) | U = Ubat | With a 30 A fuse. |
| #A2 | #2 | Diagnostic lead C-link | - | - |
| #A3 | #3 | Pedal position sensor, signal | 0-5 V | Analogue signal which indicates the position of the brake pedal. 0 mm: ≈0V 38 mm: ≈ 95% of 5 V |
| #A4 | #4 | 15-supply (power supply from the ignition switch) | U = Ubat | - |
| #A5 | #5 | Pedal position sensor, signal ground | U = Ulow | - |
| #A6 | #6 | - | - | - |
| #A7 | #7 | Pedal position sensor, power supply | U =5 V | The pedal position sensor receives 5 V from the control module. |
| #A8 | #8 | Wheel sensor right rear, signal output | Tooth against sensor U≈Ulow Cover against sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a 1kΩ and #8. Connect a voltmeter between #8 and ground connection #16. Turn the wheel slowly. |
| #A9 | #9 | - | - | - |
| #A10 | #10 | 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 1kΩ and #10. Connect a voltmeter between #10 and ground connection #16. Turn the wheel slowly. |
| #A11 | #11 | Control modules communication cable (CAN H) | U=2-3 V | - |
| #A12 | #12 | Wheel sensor right front, signal output | Tooth against sensor U≈Ulow Cover against sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a 1kΩ and #12. Connect a voltmeter between #12 and ground connection #16. Turn the wheel slowly. |
| #A13 | #13 | - | - | - |
| #A14 | #14 | Wheel sensor left front, signal output | Tooth against sensor U≈Ulow Cover against sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a 1kΩ and #14. Connect a voltmeter between #14 and ground connection #16. Turn the wheel slowly. |
| #A15 | #15 | Control modules communication cable (CAN L) | U=2-3 V | - |
| #A16 | #16 | Power and signal ground | U = Ulow | Ground terminal for the input and outlet valves and signal to the control module. |
| #A17 | #17 | - | - | - |
| #A18 | #18 | - | - | - |
| #A19 | #19 | - | - | - |
| #A20 | #20 | - | - | - |
| #A21 | #21 | - | - | - |
| #A22 | #22 | - | - | - |
| #A23 | #23 | - | - | - |
| #A24 | #24 | - | - | - |
| #A25 | #25 | - | - | - |
| #A26 | #26 | - | - | - |
| #A27 | #27 | - | - | - |
| #A28 | #28 | - | - |
- |
| #A29 | #29 | - | - | - |
| #A30 | #30 | - | - | - |
| #A31 | #31 | - | - | - |
| #A32 | #32 | 30-supply to the valves (power supply from the battery) | U = Ubat | With a 30 A fuse. |
| #A33 | #33 | Front right wheel sensor. signal | Tooth against sensor: I≈14 mA Cover against sensor: I ≈ 7 mA |
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 #12 in table. |
| #A34 | #34 | Front right 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 Cover against sensor: I ≈ 7 mA |
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 #10 in table. |
| #A38 | #38 | - | - | - |
| #A39 | #39 | - | - | - |
| #A40 | #40 | - | - | - |
| #A41 | #41 | - | - | - |
| #A42 | #42 | Rear right wheel sensor, signal | Tooth against sensor: I≈14 mA Cover against sensor: I ≈ 7 mA |
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 #8 in table. |
| #A43 | #43 | Right rear wheel sensor, power supply. | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A44 | #44 | - | - | - |
| #A45 | #45 | Front left wheel sensor, power supply | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A46 | #46 | Front left wheel sensor, signal | Tooth against sensor: I≈14 mA Cover against sensor: I ≈ 7 mA |
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. |
| #A47 | #47 | Power and signal ground | U = Ulow | Ground terminal for the pump motor. |