Comments On Trouble Symptom

The slope gradient may be low.
The vehicle is not completely stationary.
A failure may have occurred in the calibration of the G and yaw rate sensor or brake fluid pressure sensor.
The parking brake switch may be seized, which causes the HSA to fail to start the operation.
A problem (noise interference) may have occurred in the CAN bus line, resulting in an improper communication with ASC-ECU or each ECU.

NOTE:

The HSA does not work even when the wheel speed sensor outputs pulse (vehicle moved) while the vehicle is parked.
The HSA is affected by the loading conditions and vehicle posture at the occurrence of phenomenon. When checking the HSA operation in actual driving, carry out the check on the vehicle with one occupant (driver) only.