Normal Operation and Fault Conditions

Vehicles equipped with EPB are also equipped with an auto hold feature. This feature must be enabled by the driver by pressing the auto hold switch once the driver seatbelt is buckled, the driver door is closed and the engine is running. 

Pressing the auto hold switch in the FCIM enables the auto hold feature, but does not activate auto hold. When the switch is pressed, the FCIM sends a message to the ABS module indicating the system has been enabled. The ABS module then waits for messages from the RCM and BCM as well as ABS sensor information to indicate the auto hold feature can be activated. Once all the criteria has been met, the ABS module activates the auto hold feature. In the case of a system error, the instrument cluster displays messages and icons.