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?
Go to Step 2
Repair the connectors or wiring harness.
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?
Go to Step 3
Replace the electronic steering lock. Go to Step 3.
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?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).
Repair the connectors or wiring harness.
).