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 | | B278D |
Malfunction of ID-BOX Recognition |
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 | |
B278D | - | 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 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.
- The smart key system (for Start Function, HV Model) 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, HV Model) 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 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.
OK: DTC B278D is not output.
| OK |
 | END |
| NG |
| REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) | |
