Auto Hold

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

The auto hold feature is activated and deactivated through the use of the steering wheel controls and the IPC message center. For the system to activate, the vehicle must not be moving, the driver safety belt must be buckled and the driver door must be closed.

The ABS module receives the driver safety belt buckle status from the RCM, driver door status from the BCM, while brake system pressure and the wheel speed are received from the ABS sensors. This information allows the ABS module to determine if the vehicle is stopped. Once the previous conditions have been met the auto hold feature can be activated. When the system is activated, the IPC sends an auto hold message to the GWM over the HS-CAN3 and illuminates the auto hold indicator. The GWM relays the message to the ABS module over the FD-CAN.

Once the auto hold feature is activated and the driver presses the brake pedal, the ABS module closes the isolation valves in the EBB unit to maintain the current brake system pressure at the wheel ends. The ABS module maintains the pressure until the driver presses the accelerator pedal, shifts the transmission into PARK or after a specific time limit has been reached. The ABS module engages the parking brake after 2-10 minutes, depending on the grade of incline the vehicle is currently stopped on, the steeper the grade, the shorter the time.