P1445
DTC P1445 (62): Bypass Contactor Problem1. Reset the MCM.
2. Turn the ignition switch OFF, and wait for 1 minute.
3. Turn the ignition switch ON (II) without load conditions: headlights, blower fan, rear defogger and air conditioner off.
Is DTC P1445 indicated?
YES-Go to step 4.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter, the bypass contactor and the MCM.
4. Turn the ignition switch OFF.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Disconnect the DC-DC converter 8P connector.
8. Turn the battery module switch ON.
9. Turn the ignition switch ON (II).
Is DTC P1445 indicated?
YES-Go to step 22.
NO-Go to step 10.
10. Turn the ignition switch OFF.
11. Connect DC-DC converter 8P connector terminal No. 6 to-body ground with a jumper wire.
12. Check for continuity between body ground and MCM connector terminal A14.
Is there continuity?
YES-Go to step 13.
NO-Repair open in the wire between the DC-DC converser end the MCM (A14).
13. Turn the ignition switch OFF.
14. Turn the battery module switch OFF.
15. Check for continuity across the terminals of the 100 A fuse in the junction board.
Is there continuity?
YES-Go to step 16.
NO-Replace the battery module.
16. Turn the battery module switch ON.
17. Check for continuity between the battery module switch terminals.
Is there continuity?
YES-Go to step 18.
NO-Replace the battery module.
18. Turn the battery module switch OFF.
19. Check for poor connections or loose terminals at the junction board, the MPI module, and the busbars.
Are the connections OK?
YES-Go to step 20.
NO-Repair poor connections or loose terminals at the junction board, the MPI module, and the busbars.
20. Connect MCM connector terminal A14 to body ground with a jumper wire.
21. Turn the ignition switch ON (II).
Is DTC P1445 indicated?
YES-Replace the DC-DC converter.
NO-Go to step 35.
22. Turn the ignition switch OFF.
23. Disconnect MCM connector A (31P) and junction board 4P connector.
24. Check for continuity between junction board 4P connector terminal No.2 and MCM connector terminal A5.
Is there continuity?
YES-Go to step 25.
NO-Repair open in the wire between the junction board and the MCM (A5).
25. Check for continuity between junction board 4P connector terminal No. 1 and body ground.
Is there continuity?
YES-Go to step 26.
NO-Repair open in the wire between the junction board 4P connector, G551, and the MCM (A5).
26. Turn the ignition switch OFF.
27. Turn the battery module switch OFF.
28. Measure resistance between the bypass resister terminals.
Is there about 12 Ohms?
YES-Go to step 29.
NO-Replace the battery module.
29. Substitute a known-good battery module.
30. Reset the MCM.
31. Turn the ignition switch ON (II).
Is DTC P1445 indicated?
YES-Go to step 32.
NO-Replace the original battery module.
32. Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck.
33. Reset the MCM.
34. Turn the ignition switch ON (II).
Is DTC P1445 indicated?
YES-Replace the MPI module.
NO-Replace the original MCM.
35. Remove PDU covers A and B.
36. Remove the snubber unit (A), then reinstall the bolts (B).
37. Turn the battery module switch ON.
38. Turn the ignition switch ON (II).
Is DTC P1445 indicated?
YES-
^ Replace the battery module.
^ Update the MCM if it does not have the latest software, or substitute a known-good MCM, then recheck. If the symptom/indication goes away with a known-good MCM, replace the original MCM.
NO-Replace the snubber unit.