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.
Control Module And Abs Hydraulic Modulator
The brake control module (BCM) is mounted on the hydraulic modulator in the engine compartment.
The control module is supplied with power via two fuses and connected to ground by two ground terminals.
There are diagnostics for the valve coils.
The brake control module (BCM) is available in two different versions.
ABS control module
The control module contains two different micro-processors which receive signals from different sensors in the system. The micro-processors operate in parallel and use a program to compute the necessary ABS and electronic brake force distribution functions. The ABS control module has eight valve coils for the hydraulic valves, four outlet valves and four inlet valves.
The control module has a connector for connection to the car wiring.
Control module for STC (stability and traction control), DSTC (dynamic stability and traction control), and TRACS (traction control system)
The control module for STC/DSTC/TRACS has twelve valve coils for the hydraulic valves; four are outlet valve coils, four are inlet valve coils and four are used for stability and traction control.
When replacing brake control modules (BCM) with DSTC, the control module must be calibrated according to the instructions in VIDA vehicle communication or by a special test drive.
ABS hydraulic modulator
The hydraulic modulator is available in three versions; ABS, STC (stability and traction control) and DSTC (dynamic stability and traction control)/TRACS (traction control system). The ABS hydraulic modulator is located in the engine compartment.
The ABS hydraulic modulator consists of hydraulic valves, check valves and a pump motor. The pump motor builds up the brake pressure required during ABS or stability control.
There are diagnostics for the pump motor.
Use the Manual With the Right Hardware
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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.
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