Code No. B1148 ESL power supply
Code No. B1154 ESL power supply fail(ESL)



Check Conditions
  • At electric steering lock certification
Judgment Criterion
  • Short circuit (short to power supply) in the power supply (microcomputer) circuit system of the electric steering lock is detected.


  • Damaged harness wires and connectors
  • Electric steering lock malfunction
  • Malfunction of OSS-ECU
  • LIN bus malfunction <B1148 is the past trouble>


STEP 1. Check of short to power supply, short of earth, and open circuit in PCO line between electric steering lock connector and OSS-ECU connector

Q. Is the check result normal?

Go to Step 2.
Repair the connector(s) or wiring harness.

STEP 2. After performing the locking and unlocking operations of the electric steering lock, recheck the diagnosis code.

Q. Is the diagnosis code set?

Replace the electric steering lock and register the chassis number (Refer to ). Then go to Step 3.
Go to Step 3.

STEP 3. Check whether the diagnosis code is reset.

Q. Is the diagnosis code set?

Replace the OSS-ECU and register the chassis number (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction )