Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
The brake control module (BCM) receives information about wheel speed from the wheel sensors. The wheel sensors, which are on the wheel mounting, read off a pulse wheel on the wheel spindle. The wheel sensors are supplied with 12 V. When the magnetic wheel rotates, the sensor produces a pulsed current of 7 or 14 mA (quadratic wave). The amperage depends on the position of the damaged wheel.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The signal from the wheel sensor is less than 4.5 mA ± 10% or greater than 20 mA ± 10%.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Speeds above 20 km/h.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- ABS blocked.
- Traction control (TC) blocked.
- Stability control (SC) blocked.
- Active yaw control (AYC) is blocked.
- Electronic brake force distribution (EBD) blocked.
- Brake assistance (BA) blocked.

Hint: Brake system, abbreviations Brake System, Abbreviations

Possible source
- Contact resistance in the terminals.
- Open-circuit in the power supply cable.
- Short-circuit to ground in the power supply cable.
- The cables are short-circuited to each other.
- Open circuit on signal cable.
- Short-circuit to supply voltage in the signal cable.
- The signal cable is short-circuited to ground.
- Damaged wheel sensor.
- Damaged brake control module (BCM).

Fault symptom[s]

- ABS warning light on
- Anti-spin warning lamp lit
- Brake circuit warning light on
- Traction control not working
- Stability function is not working
- Adaptive cruise control; No Functionality
- Collision avoidance driver support; No Functionality
- Front monitoring/Active safety/City Safety does not work