Code No.B241A ESL power control circuit earth
Code No.B241B ESL power control circuit open


caution When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSIS FUNCTION


B241A
  • When a short to earth occurs in the wiring harness between the electrical steering lock and KOS-ECU, KOS-ECU sets the diagnosis code No.B241A.
B241B
  • When an open circuit or short to power supply occurs in the wiring harness between the electrical steering lock and KOS-ECU, KOS-ECU sets the diagnosis code No.B241B.

JUDGEMENT CRITERIA


B241A
  • When a short to earth occurs in the wiring harness, KOS-ECU determines that a problem has occurred.
B241B
  • When an open circuit or short to power supply occurs in the wiring harness, KOS-ECU determines that a problem has occurred.

PROBABLE CAUSES



  • Malfunction of the electronic steering lock
  • Malfunction of the KOS-ECU
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check of short to power supply, short to earth, and open circuit in PCK line between the electronic steering lock connector and the KOS-ECU connector, between the OSS-ECU connector and the KOS-ECU connector.


Q. Is the check result normal?





STEP 2. Voltage measurement at electronic steering lock connector (PCK line)


(1)Disconnect the connector, and measure the voltage at the wiring harness-side connector.
(2)Open the driver’s door.
(3)Measure the voltage at the electronic steering lock connector (PCK line) and the body earth.
(4)OK: System voltage

Q. Is the check result normal?





STEP 3. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?