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DTC B1149 ESL drive circuit fail
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
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 DTC B1149. At the same time, OSS-ECU displays the steering lock abnormality warning screen to the multi information display of the combination meter.
 
 
DTC SET CONDITION
Check Conditions
  • When all the following conditions are met.
    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
  • 1 second or more has elapsed after the PCKM voltage is judged to be 3.5 V or more.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector (short to power supply in PCK line, or short to power supply in PCKM line)
  • Malfunction of KOS-ECU
  • Malfunction of OSS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, read other system diagnostic trouble code
(1)
cautionTo prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958).
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) ."
(2) After performing the forced power supply output (refer to forced power supply output procedure ) "IG-ON".
(3) Check if any DTC is set to the KOS-ECU.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Diagnose the KOS-ECU. Refer to diagnostic trouble code chart .
Go to Step 2.
 
STEP 2. Check of short to power supply in PCKM line between KOS-ECU connector and OSS-ECU connector
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Using scan tool MB991958, check data list.
Check the OSS-ECU data list.
 
Operation stateItem No.Check itemDisplay
After starting the engine9ESL drive permission signal(KOS)OFF
Other than aboveON
OK: Operation state and data list display agree with each other.
Is the check result normal?
Go to Step 4.
Replace the OSS-ECU and register the VIN (Refer to ).
 
STEP 4. Check whether the DTC is reset.
Is the DTC set?
Replace the OSS-ECU and register the VIN (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction )