When replacing the ECU, always
check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the control completion information cannot be received from the electric steering lock
via LIN when the electric steering lock is locked/unlocked, KOS&OSS-ECU sets
diagnosis code No.B1144. At the same time, KOS&OSS-ECU displays the immobilizer certification
system inspection warning to the combination meter.
JUDGEMENT CRITERIA
Check Conditions
After KOS&OSS-ECU activation
Judgement Criterion
Control completion information is not received from the electric steering lock.
PROBABLE CAUSES
Electric steering lock malfunction
LIN bus line malfunction
Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of short to earth, short to power supply
or open circuit in LIN 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. 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 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 ).