Toyota Yaris: Smart Key System (for Start Function) / ID-BOX Component Internal Failure (B278D96)
DESCRIPTION
When the certification ECU (smart key ECU assembly) detects an input signal indicating that the vehicle is equipped with an ID code box even though the ID code box is not registered, the certification ECU (smart key ECU assembly) stores this DTC.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Note |
B278D96 | ID-BOX Component Internal Failure | One of the following conditions is met: -
The certification ECU (smart key ECU assembly) recognizes that the wire harness judging whether the vehicle is equipped with an ID code box or not is provided even though the ID code box is not registered.
-
The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the ID code box is not registered.
-
The certification ECU (smart key ECU assembly) receives a LIN signal from the ID code box even though the wire harness judging whether the vehicle is equipped with an ID code box or not is not provided.
| Misconnection of the ID code box | DTC output confirmation operation: |
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected | Fail-safe Operation when Malfunction Detected |
Key registration will be prohibited | - |
Related Data List and Active Test
DTC No. | Data List and Active Test |
B278D96 | - |
CAUTION / NOTICE / HINT
NOTICE:
-
When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS 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 GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
-
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Click here
-
Before performing following procedure, check that the ID code box (immobiliser code ECU) is not installed on the vehicle.
-
Before replacing the certification ECU (smart key ECU assembly), refer to the Registration.
Click here
-
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
PROCEDURE
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
NEXT |
| |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
Result | Proceed to |
DTC B278D96 is not output. | A |
DTC B278D96 is output. | B |
A |
| END |
B |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
DESCRIPTION When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC...
DESCRIPTION A transponder key amplifier is built into the certification ECU (smart key ECU assembly). When a communication malfunction occurs with the transponder key amplifier inside the certification ECU (smart key ECU assembly), this DTC is stored...
Other information:
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 camshaft removal/installation are shown below. Necessary Procedure After Parts Removed/Installed/Replaced Replaced Part or Performed Procedure Necessary Procedure Effect/Inoperative Function when Necessary Procedure not Performed Link
Camshaft (for intake or exhaust camshaft)
Camshaft timing gear assembly
Camshaft timing exhaust gear assembly
Engine coolant temperature sensor
Spark plug
Inspection After Repair
Poor idle, etc...
Inspect all tire pressures monthly (including the spare) when the tires
are cold. Maintain recommended pressures for the best ride, handling, and
minimum tire wear.
Refer to the specification charts.
With tire pressure monitoring system:
After adjusting the tire pressure, initialization of the tire pressure
monitoring system is necessary to make the system operate normally...
Categories
WARNING
When removing the fuel-filler cap, loosen the cap slightly and wait
for
any hissing to stop, then remove it
Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness
if
ingested. Fuel spray is released when there is pressure in the fuel tank and
the fuel-filler cap is removed too quickly.
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