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Diagnosis Procedure
1.CHECK AROUND BOSE SPEAKER AMP.
Check whether there is any factor which causes a temperature rise near BOSE speaker amp.
Was there any factor?
Remove a factor.
.
 
2.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
With M.U.T.-III SE
  1. Move the vehicle to a cool place.
  2. Turn ignition switch ON.
  3. Erase DTC.
  4. Perform DTC confirmation procedure again. Refer to DTC Description.
  5. Check DTC.
Is DTC "B1A80-4B" detected again?
Replace BOSE speaker amp. Refer to Removal and Installation.
INSPECTION END