Toyota Camry (XV70): 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.
Click here
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- 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 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
|
1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
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| 2. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble CodesOK:
DTC B278C is not output.
| OK | .gif) | USE SIMULATION METHOD TO CHECK
|
| NG | | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
READ NEXT:
Components
COMPONENTS ILLUSTRATION
*A w/ Smart Key System
- -
*1 ECU INTEGRATION BOX RH
*2 LOWER INSTRUMENT PANEL SUB-ASSEMBLY
*3 CENTRAL GATEWAY ECU (NETWORK GATE
Removal
REMOVAL CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during c
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE
1. VEHICLE BROUGHT TO WORKSHOP
NEXT
2.
CUSTOMER PROBLEM ANALYSIS
HINT:
In troubleshoot
Bleeding
BLEEDING CAUTION / NOTICE / HINT
NOTICE:
Move the shift lever to P and apply the parking brake before bleeding the brakes.
Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
If brake fluid leaks onto any painted surface, immedi
