DTC B12F2: Power Control Unit Lost Communication with Keyless Access Control Unit

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:

  1. Clear the DTCs with the HDS.

  2. Do this procedure 10 times: Turn the vehicle to the OFF(LOCK) mode, ACCESSORY mode, ON mode, and OFF(LOCK) mode.

  3. Turn the vehicle to the ON mode.

  4. Check for DTCs with the HDS.

  DTC Description	DTC
  B12F2 Power control unit lost communication with keyless access control unit

  Is DTC B12F2 indicated?

  YES 

  Replace the keyless access control unit .

  NO 

  Intermittent failure, the system is OK at this time. Check for loose or poor connections.