PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): U012587,U012987,U014087,U029387; Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; 2022 MY Avalon HV [08/2021

Last Modified: 08-21-2023	6.11:8.1.0	Doc ID: RM100000001XOFB
Model Year Start: 2022	Model: Avalon HV	Prod Date Range: [08/2021 - ]
Title: PARKING BRAKE: ELECTRIC PARKING BRAKE SYSTEM (for HV Model): U012587,U012987,U014087,U029387; Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; 2022 MY Avalon HV [08/2021 - ]

DTC

U012587

Lost Communication with Multi-axis Acceleration Sensor Module Missing Message

DTC

U012987

Lost Communication with Brake System Control Module "A" Missing Message

DTC

U014087

Lost Communication with Body Control Module Missing Message

DTC

U029387

Lost Communication with Hybrid/EV Powertrain Control Module Missing Message

DESCRIPTION

The parking brake ECU (brake actuator assembly) communicates with the acceleration sensor (airbag ECU assembly), skid control ECU (brake booster with master cylinder assembly), main body ECU (multiplex network body ECU) and hybrid vehicle control ECU via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	Note
U012587	Lost Communication with Multi-axis Acceleration Sensor Module Missing Message	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 acceleration sensor (airbag ECU assembly).	CAN communication system Acceleration sensor (airbag ECU assembly)	DTC stored	An electric parking brake system malfunction is displayed on the combination meter assembly.
U012987	Lost Communication with Brake System Control Module "A" Missing Message	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 combination meter assembly.
U014087	Lost Communication with Body Control Module Missing Message	Parking brake ECU (brake actuator assembly) cannot receive signals from the main body ECU (multiplex network body ECU) for approximately 2 seconds.	CAN communication system Main body ECU (multiplex network body ECU)	DTC stored	An electric parking brake system malfunction is displayed on the combination meter assembly.
U029387	Lost Communication with Hybrid/EV Powertrain Control Module Missing Message	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 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 combination meter assembly.

PROCEDURE

1.	GO TO CAN COMMUNICATION SYSTEM

(a) Go to CAN communication system.

Click here

END