Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication With Brake System Control Module Missing Message (U012987,U014087,U029387)

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Exterior / Acoustic Vehicle Alerting System / Acoustic Vehicle Alerting System / Lost Communication With Brake System Control Module Missing Message (U012987,U014087,U029387)

DESCRIPTION

These DTCs are stored when the CAN communication system is malfunctioning.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Priority

U012987

Lost Communication With Brake System Control Module Missing Message

The vehicle approaching speaker controller does not receive data from the skid control ECU (brake actuator assembly) for approximately 10 seconds or more.

  • CAN communication system
  • Skid control ECU (brake actuator assembly)

Acoustic Vehicle Alerting System

A

U014087

Lost Communication with Body Control Module Missing Message

The vehicle approaching speaker controller does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.

  • CAN communication system
  • Main body ECU (multiplex network body ECU)

Acoustic Vehicle Alerting System

A

U029387

Lost Communication with Hybrid/EV Powertrain Control Module Missing Message

The vehicle approaching speaker controller does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.

  • CAN communication system
  • Hybrid vehicle control ECU

Acoustic Vehicle Alerting System

A

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Acoustic Vehicle Alerting System > Trouble Codes

HINT:

When DTCs indicating a CAN communication system malfunction are output, perform troubleshooting for the CAN communication system before the acoustic vehicle alerting system.

NEXT

GO TO CAN COMMUNICATION SYSTEM

    READ NEXT:

     Software Incompatibility with Body Control Module Invalid/Incompatible Software Component (U032257)

    DESCRIPTION The vehicle approaching speaker controller receives vehicle information from the main body ECU (multiplex network body ECU) via CAN communication. This DTC is stored when the vehicle info

     There is No Sound Made

    DESCRIPTION Based on signals received from each ECU, the vehicle approaching speaker controller outputs warning sounds through the vehicle approaching speaker assembly. WIRING DIAGRAM CAUTION / NOTI

     Vehicle Approaching Speaker

    SEE MORE:

     Data List / Active Test

    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values or states of swit

     Removal

    REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL) Procedure Part Name Code 1 CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY 30400 - - - 2 TRANSFER ASS

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