DTC B12A1: Power Control Unit Internal (CPU) Error

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

• 1. Problem verification:

  1. Turn the vehicle to the ON mode.

  2. Clear the DTCs with the HDS.

  3. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.

  4. Check for DTCs with the HDS.

  DTC Description	DTC
  B12A1 Power control unit internal (CPU) error

  Is DTC B12A1 indicated?

  YES 

  Replace the keyless access control unit .

  NO 

  Intermittent failure, the system is OK at this time.