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HOMESERVICE MANUALSVOLVO2003XC70REPAIR AND DIAGNOSISBRAKESTRACTION CONTROLBRAKE CONTROL SYSTEM - SPECIFICATIONS, ELECTRICAL/ELECTRONIC (XC)SIGNAL SPECIFICATION, BRAKE CONTROL MODULE (2002-2007)SIGNAL SPECIFICATION, BRAKE CONTROL MODULE (BCM) WITH DSTC (DYNAMIC STABILITY AND TRACTION CONTROL)
2003 Volvo XC70
Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control)
2003 Volvo XC70SECTION Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control)
All values given are between the relevant terminal in column 1 and terminal #A16 or #A47 (ground), unless otherwise indicated in brackets.
Connections 9, 13, 24, 26, 35, 38, 40-41 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 | 30-supply pump motor (power supply from battery) | U = Ubat | With a 30 A fuse. |
| #A2 | #2 | Diagnostic lead C-link | - | - |
| #A3 | #3 | Pedal position sensor, signal | 0-5 V | Brake pedal position, analog signal. 0 mm: ≈0 V 38.5 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 | Active yaw control sensor, power supply | U = Ubat | The active yaw control sensor receives 12 V from the control module. |
| #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 at sensor U≈Ulow Cover at sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 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 at sensor U≈Ulow Cover at sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 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 at sensor U≈Ulow Cover at sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 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 at sensor U≈Ulow Cover at sensor U≈Ubat |
Measure by creating a temporary voltage supply between #1 via a resistance of 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 | Pressure build-up valve, power supply. | U=4.75-5.25 V | - |
| #A18 | #18 | Brake pressure sensor 2 (B), voltage-feed | U=4.75-5.25 V | Due to possibility of incorrect installation,#18-#20 may also be Brake pressure sensor 1 (A). |
| #A19 | #19 | Brake pressure sensor 2 (B), signal ground | U=Ulow | - |
| #A20 | #20 | Brake pressure sensor 2 (B), signal | U=0.25-4.75 V | Analog signal 0-170 bar 23 mV/bar 0 bar = 0.5 V |
| #A21 | #21 | Brake pressure sensor 1 (A), signal ground. | U=Ulow | Due to possibility of incorrect installation,#21-#23 may also be Brake pressure sensor 2 (B). |
| #A22 | #22 | Brake pressure sensor 1 (A), voltage-feed. | U=4.75-5.25 V | - |
| #A23 | #23 | Brake pressure sensor 1 (A), signal | U=0.25-4.75 V | Analog signal 0-170 bar 23 mV/bar 0 bar = 0.5 V |
| #A24 | #24 | - | - | - |
| #A25 | #25 | Active yaw control sensor, communication cable (CAN L) | U=2-3 V | - |
| #A26 | #26 | - | - | - |
| #A27 | #27 | Pedal pressure switch, signal | Open: U≈Ulow Closed: U ≈Ubat |
The pedal pressure switch is open when the brake pedal is depressed. |
| #A28 | #28 | Test signal for the pedal pressure switch | - | - |
| #A29 | #29 | Active yaw control sensor, communication cable (CAN H) | U=2-3 V | - |
| #A30 | #30 | Pedal pressure switch, signal | The pedal pressure switch is closed when the brake pedal is not pressed. | |
| #A31 | #31 | Pressure build-up valve, power supply | 12 V | Pulse width modulated signal: maximum 4A 18kHz |
| #A32 | #32 | 30-supply for the valves (power supply from 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 |
| #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 the chart |
| #A38 | #38 | - | - | - |
| #A39 | #39 | Active yaw control sensor, ground | U=Ulow | - |
| #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 the chart |
| #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 the chart |
| #A47 | #47 | Power and signal ground | U=Ulow | Ground terminal for the pump motor. |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.