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DTC B1142: ESL authenticate error; DTC B1151 OSS authenticate timeout (ESL): Diagnosis

  1. STEP 1. After turning the forced power supply output to "IG-ON" using the scan tool MB991958, check if the DTC B1161 is set. 

    Q: Is the DTC set? 

    1. YES:  Carry out the troubleshooting for the DTC B1161. Refer to DTC B1159 VIN not programmed (OSS); DTC B1160 Key code not programmed (OSS); DTC B1164 VIN not programmed (ESL); DTC B1165 Key code not programmed (ESL)  .
    2. NO:  Go to Step 2.
  2. STEP 2. After performing the locking and unlocking operations of the electric steering lock, recheck the DTC. 

    Q: Is the DTC set? 

    1. YES:  Replace the electric steering lock and register the VIN (Refer to CHECK OF ENGINE SWITCH REMINDER TONE ALARM  ).
    2. NO:  Intermittent malfunction is suspected (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
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