DTC B1552: Extension Module Malfunction; DTC B158A: Extension Module Noise Adjustment Malfunction: Procedure
- CHECK DTC
- Clear the DTCs. Refer to DTC CHECK / CLEAR .
- 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
- USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- REPLACE EXTENSION MODULE. Refer to REMOVAL