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:

     Removal

    REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL) Procedure Part Name Code 1 BACK DOOR STAY ASSEMBLY 68960B - - 2 BACK DOOR DAMPER STAY UPPER BRACKET 68946 - - - 3 BACK DOOR DAMPER STAY LOWER BRACKET 68948

     Cooling System

    DESCRIPTION The cause of the malfunction may be the cooling system. Check whether the grille is blocked, whether coolant is leaking, the radiator fan operating condition and whether coolant has frozen. Related Parts Check Area Inspection Grille blockage, coolant amount, coolant

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