P1445
DTC P1445 (62): Bypass Contactor Problem1. Reset the MCM.
2. Turn the ignition switch OFF.
3. Turn the ignition switch ON (II) with no load conditions: headlights, blower fan, rear defogger, and air conditioner off.
Is DTC P1445 indicated?
YES - Go to step 17.
NO - Go to step 4.
4. Turn the ignition switch OFF.
5. Turn the ignition switch ON (II) with load conditions: headlights, blower fan, rear defogger, and air conditioner on.
Is DTC P1445 indicated?
YES - Go to step 6.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter, bypass contactor, and at the MCM.
6. Turn the ignition switch OFF.
7. Turn the battery module switch OFF, and wait 5 minutes.
8. Remove the IPU lid, and make sure there is 30 V or less at the junction terminals.
9. Turn the battery module switch ON.
10. Measure voltage between MCM connector terminals F10 and F14.
Is there more than 100 V DC?
YES - Go to step 11.
NO - Replace the battery module.
11. Turn the battery module switch OFF.
12. Turn the ignition switch ON (II).
13. Measure voltage between body ground and DC-DC converter 8P connector terminal No. 6.
Is there battery voltage?
YES - Replace the DC-DC converter.
NO - Go to step 14.
14. Turn the ignition switch OFF.
15. Connect DC-DC converter 8P connector terminal No. 6 to body ground with a jumper wire.
16. Check for continuity between body ground and MCM connector terminal A14.
Is there continuity?
YES - 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 - Repair open in the wire between the DC-DC converter and the MCM (A14).
17. Turn the ignition switch OFF.
18. Turn the battery module switch OFF, and wait 5 minutes.
19. Remove the IPU lid, and make sure there is less than 30 V at the junction terminals.
20. Disconnect the junction board 4P connector.
21. Connector a voltmeter between junction board 4P connector terminals No. 1 and No. 2, then turn the ignition switch ON (II).
Is there momentary battery voltage?
YES - Replace the battery module.
NO - Go to step 22.
22. Turn the ignition switch OFF.
23. Measure voltage between MCM connector terminals AS and A23, then turn the ignition switch ON (II).
Is there momentary battery voltage?
YES - Repair open in the wire between the junction board 4P connector and MCM (A5).
NO - 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.