Code No. B1149 ESL drive circuit fail

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


When a short to power supply is detected in the electric steering lock driving circuit during the engine start or during travelling, OSS-ECU sets the diagnosis code No.B1149. At the same time, OSS-ECU displays the steering lock abnormality warning screen to the multi information display of the combination meter.


Check Conditions
  1. Power supply mode: ON
  2. Battery voltage: 8 V or more
  3. During travelling (vehicle speed of 6 km/h or more) or engine is running (engine speed of 60 r/min or more)
Judgment Criterion



STEP 1. M.U.T.-III other system diagnosis code

After turning the forced power supply output (refer to ) to "IG-ON" using the M.U.T.-III, check the diagnosis code of KOS-ECU.

Q. Is the diagnosis code set?

Diagnose the KOS. Refer to .
Go to Step 2.

STEP 2. Check of short to power supply, short of earth, and open circuit in PCK line between KOS-ECU connector and OSS-ECU connector

Q. Is the check result normal?

Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. M.U.T.-III data list

Check the OSS-ECU data list.
Operation state
Item No.
Check item
After starting the engine
ESL drive permission signal(KOS)
Other than above
OK: Operation state and data list display agree with each other.

Q. Is the check result normal?

Go to Step 4.
Replace the OSS-ECU and register the chassis number (Refer to )

STEP 4. 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 )