Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with Power Source Control (B278C)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Lin Communication System(for Gasoline Model) / 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:

Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
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When using the Techstream with the engine 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 Model Code "KEY REGIST" 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.

PROCEDURE

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Smart Key > Clear DTCs

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes

OK:

DTC B278C is not output.

USE SIMULATION METHOD TO CHECK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Lin Communication System(for Gasoline Model)

P/W Master Switch Communication Stop (B1206,B1273,B2321-B2324)

See More:

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