DTC B1552: Extension Module Malfunction; DTC B158A: Extension Module Noise Adjustment Malfunction; DTC B15BA: XM Tuner Malfunction [08/2015 - ]: Procedure

CHECK DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Recheck for DTCs and check that no DTCs are output.
  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 [08/2015 - ]
REPLACE STEREO COMPONENT TUNER ASSEMBLY. Refer to REMOVAL [08/2015 - ]