P1556
DTC P1556 (52): Battery Module Temperature Sensor 2 Signal Circuit High Input1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC P1554 indicated?
YES-Go to step 3.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the battery module and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Disconnect MCM connector E (22P) and the battery module 6P connector.
7. Check for continuity between MCM connector terminal E3 and battery module 6P connector No. 5.
Is there continuity?
YES-Go to step 8.
NO-Repair open in the wire between the battery module and the MCM (E3).
8. Turn the ignition switch OFF.
9. Reconnect MCM connector E (22P).
10. Turn the ignition switch ON (II).
11. Measure voltage between battery module 6P connector terminals No. 4 and No. 5.
Is there about 5 V?
YES-Replace the battery module.
NO-Go to step 12.
12. Measure voltage between MCM connector terminals E3 and E13.
Is there about 5 V?
YES-Repair open in the wire between the battery module and the MCM (E13).
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.