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DTC B1552: Extension Module Malfunction; DTC B158A: Extension Module Noise Adjustment Malfunction: Procedure

  1. CHECK DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Recheck for DTCs and check if the same DTC is output again.

      OK

      No DTCs are output.

    NG → See step   3 

    OK → See step   2 

  2. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  3. REPLACE EXTENSION MODULE. Refer to  REMOVAL