Lexus ES: Lost Communication with Power Source Control (B278C)
Lexus ES (XZ10) Service Manual / Power Source & Network / Networking / Lin Communication System (for Hv Model) / 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
NOTICE:
- When using the Techstream with the power 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 Access. 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.
-
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
Click here
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PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Access > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Access > Trouble CodesOK:
DTC B278C is not output.
| OK |  | USE SIMULATION METHOD TO CHECK |
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
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No Response from ID BOX (B2789)
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
No Response from Steering Lock ECU (B2786)
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
Communication Malfunction between ECUs Connected by LIN (B2785)
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:
Vehicle Lift And Support Locations
VEHICLE LIFT AND SUPPORT LOCATIONS
PRECAUTIONS ABOUT VEHICLE CONDITION WHEN RAISING VEHICLE
(a) The vehicle must be unloaded before jacking up or raising the vehicle. Never
jack up or raise a heavily loaded vehicle.
(b) When removing any heavy components, like the engine, transmission, or trans
On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT CAUTION: To avoid the danger of being burned, do not remove the reserve tank cap while the coolant (for inverter) is still hot. Pressurized, hot coolant (for inverter) and steam may be released and cause serious burns. PROCEDURE 1. INSPECT FOR COOLANT L
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