Test G: DTC C1799: Electronic Parking Brake (EPB) Hall-Effect Circuit Failure

PINPOINT TEST G: DTC C1799: ELECTRONIC PARKING BRAKE (EPB) HALL-EFFECT CIRCUIT FAILURE

G1-G2:

G2-G4:

G4-G6:

G6 Continued:

Normal Operation
he electronic parking brake (EPB) actuator contains a Hall-effect sensor, which the EPB module uses to determine how long the EPB motor is required to run during an application or release of the parking brake. The Hall-effect sensor receives power (approximately 2 volts less than the battery voltage) from the EPB module through circuit 7-CG20 (YE/VT). Circuit 8-CG20 (WH/VT) provides a signal to the EPB module and this signal varies between 0 and 4.4 volts when the EPB motor is rotating. The voltage varies due to the presence of a magnetic field, which is being detected by the Hall-effect sensor. Ground to the Hall-effect sensor is supplied by circuit 9-CG20 (BN/VT).

Possible Causes
- circuit 7-CG20 (YE/VT) short to voltage, short to ground, or open
- circuit 8-CG20 (WH/VT) short to voltage, short to ground, or open
- circuit 9-CG20 (BN/VT) short to voltage, short to ground, or open
- EPB actuator
- EPB module