Toyota CH-R Service Manual: Lost Communication with Power Source Control (B278C)

Toyota CH-R Service Manual / Networking / Lin Communication System / Lost Communication with Power Source Control (B278C)

DESCRIPTION

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B278C

Lost Communication with Power Source Control

An internal malfunction occurs in the certification ECU (smart key ECU assembly).

Certification ECU (smart key ECU assembly)

HINT:

The power management control ECU is built into the certification ECU (smart key ECU assembly).

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the ignition switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • If the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is replaced, refer to Registration.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Click here

Body Electrical > Smart Key > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Click here

Body Electrical > Smart Key > Trouble Codes

OK:

DTC B278C is not output.

OK

USE SIMULATION METHOD TO CHECK

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    Rear Door LH ECU Communication Stop (B2324)
    DESCRIPTION This DTC is stored when LIN communication between the power window regulator motor assembly (for rear LH door) and main body ECU (multiplex network body ECU) stops for 10 seconds or m ...

    Front Passenger Side Door ECU Communication Stop (B2322)
    DESCRIPTION This DTC is stored when LIN communication between the power window regulator motor assembly (for front passenger door) and main body ECU (multiplex network body ECU) stops for 10 seco ...

    Other materials:

    Toyota CH-R Service Manual > Electric Parking Brake Actuator: Removal
    REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. PRECAUTION Click here 2. RELEASE PARKING BRAKE (a) Move the shift lever to P. (b) Turn the ignition switch to ON. (c) Ope ...

    Toyota CH-R Service Manual > Front Seat Side Airbag Assembly: On-vehicle Inspection
    ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT CAUTION: Be sure to correctly follow the removal and installation procedures for the front seat airbag assemblies. PROCEDURE 1. INSPECT FRONT SEAT AIRBAG ASSEMBLY (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check. Cli ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2024 Copyright www.tochr.net
    0.0136