BCM-0030

BCM 0030/0040 Rear Wheel Sensor (Signal Missing)



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. Diagnostic Trouble Code (DTC) BCM-0010, BCM-0020, BCM-0030 or BCM-0040 is stored, depending on the wheel sensor, if the control module registers that the signal from any of the wheel sensors is distorted or missing too many times.
- BCM-0010: Wheel sensor, left front
- BCM-0020: Wheel sensor, right front
- BCM-0030: Wheel sensor, left rear
- BCM-0040: Wheel sensor, right rear. The Diagnostic Trouble Code (DTC) can be diagnosed at speeds above 10 km/h.

Substitute value
- The ABS is blocked
- Electronic Brake force Distribution is blocked if two or more wheel sensors are not working
- Traction control is blocked
- Stability control is blocked
- Active yaw control is blocked
- Brake assistance is blocked.

Hint: For information about brake system abbreviations, see Brake system abbreviations.

Possible Source
- Contact resistance in the terminals
- Open-circuit, short-circuit to ground or supply voltage in the power supply to the wheel sensor
- The signal cables are short-circuited to each other
- Short-circuit to supply voltage or ground in the signal cable
- Open-circuit in the signal cable
- Defective wheel sensor
- Internal fault in the control module.

Fault symptom[s]
- General warning lamp lit
- The ABS warning lamp is lit
- The anti-spin warning lamp is lit (up to and including 2002 model year)
- The warning lamp for brake circuit not functioning is lit
- The ABS system does not function
- Anti-spin does not function
- The stability control system does not function
- The traction control system does not function.

Note: If the fault is intermittent the ABS warning lamp will not go out until the vehicle speed exceeds 10 km/h in the next operating cycle.