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


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

DIAGNOSTIC FUNCTION


When an error is detected to the circuit system of the electric steering lock, KOS&OSS-ECU sets diagnosis codes No.B1148 and No.B1154. At the same time, KOS&OSS-ECU displays the steering lock abnormality warning to the combination meter. Also, when diagnosis code No.B1148 is the past trouble, the LIN bus may have a problem.

JUDGEMENT CRITERIA


Check Conditions
Judgement Criterion

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check of short to power supply in PCO line between electric steering lock connector and KOS&OSS-ECU connector


Q. Is the check result normal?

Go to Step 2.

Repair the connector(s) or wiring harness.

STEP 2. Check of short to earth and open circuit in PCO line between electric steering lock connector and KOS&OSS-ECU connector


note Because the conformity cannot be determined even when the digital tester is used to measure the voltage of PCO line between the electric steering lock connector and KOS&OSS-ECU connector, be sure to use the analogue tester (With the keyless operation key placed outside of the vehicle, if the tester needle swings to the battery voltage when the engine switch is operated, it is judged normal).

Q. Is the check result normal?

Go to Step 3.

Repair the connector(s) or wiring harness.

STEP 3. 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 4.

Go to Step 4.

STEP 4. Check whether the diagnosis code is set again.


Q. Is the diagnosis code set?

Replace the KOS&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 ).