DTC U0073: Control Module Communication Bus OFF; DTC U0124: Lost Communication With Lateral Acceleration Sensor Module; DTC U0129: Lost Communication With Brake System Control Module; DTC U0293: Lost Communication With Hybrid Vehicle Control System [08/2019 - ]: Description

The parking brake ECU assembly communicates with the hybrid vehicle control ECU assembly, skid control ECU assembly and deceleration sensor (yaw rate sensor assembly) via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
U0073	Control Module Communication Bus OFF	Both of following conditions are met: Power switch on (IG) Bus is off (communication with other ECUs is not possible).	CAN communication system	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0124	Lost Communication With Lateral Acceleration Sensor Module	Both of following conditions are met: Vehicle is being driven at 7 km/h (4.3 mph) or more. Parking brake ECU assembly cannot receive signals from the deceleration sensor (yaw rate sensor assembly).	CAN communication system Deceleration sensor (Yaw rate sensor assembly)	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0129	Lost Communication With Brake System Control Module	Both of following conditions are met: Power switch on (IG). Parking brake ECU assembly cannot receive signals from the skid control ECU assembly for approximately 1 second or 10 seconds (malfunction duration differs depending on the signal).	CAN communication system Skid control ECU assembly	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.
U0293	Lost Communication With Hybrid Vehicle Control System	Both of following conditions are met: Vehicle being driven at 15 km/h (9 mph) or more. Parking brake ECU assembly cannot receive signals from the hybrid vehicle control ECU assembly for approximately 1 second or 10 seconds (malfunction detection duration differs depending on the signal).	CAN communication system Hybrid vehicle control ECU assembly	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.