Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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 | - |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.