Lexus ES: Lost Communication with Power Source Control (B278C)
DESCRIPTION
When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored.
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) |
CAUTION / NOTICE / HINT
PROCEDURE
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs
NEXT | | |
(a) Check for DTCs.
Body Electrical > Smart Access > Trouble Codes
OK:
DTC B278C is not output.
OK | | USE SIMULATION METHOD TO CHECK |
NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
READ NEXT:
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) stops for 10 seconds or more. DTC No. Detection
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or upper bracket assembly) stops for 10 secon
DESCRIPTION If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more, DTC B2785 will be stored. DTC
SEE MORE:
The warning lights and indicators on the instrument cluster, center
panel and
outside rear view mirrors inform the driver of the status of the vehicle's
various
systems.
Warning lights and indicators displayed on the instrument cluster
The image may differ from the actual condition.
Warni
CAUTION / NOTICE / HINT HINT:
Use the following procedure to troubleshoot the lighting system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT:
In troubleshooting, confirm that the problem symptoms h
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