PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): U0073,U0100,U0124,U0129,U0293; Control Module Communication Bus OFF; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G8ZZ
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): U0073,U0100,U0124,U0129,U0293; Control Module Communication Bus OFF; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

U0073

Control Module Communication Bus OFF

DTC

U0100

Lost Communication With ECM/PCM "A"

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

DESCRIPTION

The parking brake ECU (brake actuator assembly) communicates with the hybrid vehicle control ECU assembly, skid control ECU (brake booster with master cylinder assembly) and deceleration sensor (airbag ECU 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.
U0100	Lost Communication With ECM/PCM "A"	Both of following conditions are met: Vehicle being driven at 6 km/h (4 mph) or more. Parking brake ECU (brake actuator assembly) cannot receive signals from the ECM for approximately 15 seconds.	CAN communication system ECM	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 6 km/h (4 mph) or more. Parking brake ECU (brake actuator assembly) cannot receive signals from the deceleration sensor (airbag ECU assembly) for approximately 15 seconds.	CAN communication system Deceleration sensor (Airbag ECU 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 (brake actuator assembly) cannot receive signals from the skid control ECU (brake booster with master cylinder assembly) for approximately 15 seconds or 30 seconds (malfunction duration differs depending on the signal).	CAN communication system Skid control ECU (brake booster with master cylinder 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 6 km/h (4 mph) or more. Parking brake ECU cannot receive signals from the hybrid vehicle control ECU for approximately 15 seconds.	CAN communication system Hybrid vehicle control ECU	DTC stored	An electric parking brake system malfunction is displayed on the multi-information display.

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

(a) Go to CAN communication system.

Click here

END