B12F0
DTC Troubleshooting: B12F0
DTC B12F0:
Power Control Unit Lost Communication With Electric Steering Lock
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.
1. Clear the DTCs with the HDS.
2. Do this procedure 10 times: Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.
3. Check for DTCs with the HDS.
Is DTC B12F0 indicated?
YES -
Go to step 4.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
4. Measure the voltage between body ground and electric steering lock 12P connector terminal No. 4.
Is there battery voltage?
YES -
Go to step 5.
NO -
Blown No. 12 (10 A) fuse in the passenger's under-dash fuse/relay box, or repair an open or high resistance in the wire.
5. Measure the voltage between body ground and electric steering lock 12P connector terminal No. 12.
Is there less than 0.2 V?
YES -
Go to step 6.
NO -
Repair an open or high resistance in the ground wire or poor ground (G405).
6. Press the engine start/stop button to select the OFF mode.
7. Disconnect these items:
- Electric steering lock 12P connector
- Power control unit connector C (36P)
- Remote slot control unit 40P connector
- Keyless access control unit connector B (32P)
8. Check for continuity between body ground and electric steering lock 12P connector terminal No. 1.
Is there continuity?
YES -
Repair a short to ground in the wire.
NO -
Go to step 9.
9. Check for continuity between electric steering lock 12P connector terminal No. 1 and power control unit connector C (36P) terminal No. 2.
Is there continuity?
YES -
Go to step 10.
NO -
Repair an open or high resistance in the wire.
10. Reconnect these items:
- Electric steering lock 12P connector
- Power control unit connector C (36P)
- Remote slot control unit 40P connector
- Keyless access control unit connector B (32P)
11. Do the battery terminal disconnect procedure.
12. Wait for at least 10 seconds to clear the DTCs.
13. Do the battery terminal reconnection procedure.
14. Turn the keyless access system mode switch ON.
15. If necessary, remove the remote from the remote slot.
16. Press the engine start/stop button to select the ON mode, then select the OFF mode.
17. Insert the remote into the remote slot.
18. Press and hold the engine start/stop button to select the ON mode.
Does the mode change to ON?
YES -
Go to step 19.
NO -
Go to step 22.
19. Clear the DTCs with the HDS.
20. Do this procedure 10 times: Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.
21. Check for DTCs with the HDS.
Is DTC B12F0 indicated?
YES -
Replace the electric steering lock Service and Repair.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
22. Connect the HDS to the data link connector (DLC).
23. Select COMMUNICATION STATUS in the INSPECTION MENU with the HDS.
24. Check the value of STATUS with ESL, STATUS with KEYLESS ACCESS CONTROL UNIT, and STATUS with SLOT with the HDS.
Are only Status with ESL values indicated?
YES -
Replace the electric steering lock Service and Repair.
NO -
Replace the power control unit.