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:
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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:
DIAGNOSTIC TROUBLE CODE CHART Diagnostic Trouble Code Chart DTC No. Detection Item Trouble Area Link B1003 ECU Malfunction Central gateway ECU (network gateway ECU)
ADJUSTMENT PROCEDURE 1. SECURE VEHICLE (a) Fully apply the parking brake and chock a wheel. CAUTION:
Make sure to apply the parking brake and chock a wheel before performing this procedure.
If the vehicle is not secure and the shift lever is moved to N, the vehicle may suddenly move, possibly r
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