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Signal Specification, Abs Control Module
2011 Volvo XC90 Base, FWDSECTION Signal Specification, Abs Control Module
All values given are between the relevant terminal in column 1 and terminal #A8 or #A24 (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 |
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Other |
| #A1 | #1 | 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. |
| #A2 | #2 | Front left wheel sensor power supply | U = Ubat | - |
| #A3 | #3 | - | - | - |
| #A4 | #4 | 15l-supply (power supply from ignition switch) | U = Ubat | - |
| #A5 | #5 | 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. |
| #A6 | #6 | Rear left wheel sensor power supply | U = Ubat | - |
| #A7 | #7 | - | - | - |
| #A8 | #8 | Power and signal ground (measured to battery negative terminal) | U≈Ulow | - |
| #A9 | #9 | 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. |
| #A10 | #10 | Control modules communication cable (CAN L) | U=2-3V | - |
| #A11 | #11 | Control modules communication cable (CAN H) | U=2-3V | - |
| #A12 | #12 | - | - | - |
| #A13 | #13 | - | - | - |
| #A14 | #14 | Stop lamp switch signal (applies only to AWD TRACS) | Open: U≈Ulow Closed: U≈Ubat. |
The stop lamp switch closes when braking. |
| #A15 | #15 | - | - | - |
| #A16 | #16 | - | - | - |
| #A17 | #17 | - | - | - |
| #A18 | #18 | Stop lamp switch signal | Open: U≈Ulow Closed: U≈Ubat |
The stop lamp switch closes when braking. |
| #A19 | #19 | 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. |
| #A20 | #20 | Power supply, rear right wheel sensor | U = Ubat | - |
| #A21 | #21 | - | - | - |
| #A22 | #22 | Power supply, rear right wheel sensor | U = Ubat | The wheel sensor receives 12 V from the control module. |
| #A23 | #23 | 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. |
| #A24 | #24 | Power and signal ground (measured to battery negative terminal) | U≈Ulow | - |
| #A25 | #25 | 30-supply pump motor (power supply from the battery) | U≈Ubat | - |
RENDER: 1.0x
NO RELATED
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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.