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. Check for continuity between MCM connector terminals E13 and body ground.
Is there continuity?
YES - Go to step 7.
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.
7. Check for continuity between battery module 6P connector terminal No. 4 and body ground.
Is there continuity?
YES - Go to step 8.
NO - Repair open in the wire between the battery module and the MCM (E13).
8. Turn the ignition switch ON (II).
9. Measure voltage between battery module 6P connector terminal No.5 and body ground.
Is there more than 2.5V?
YES - Replace the battery module.
NO - Go to step 10.
10. Check for continuity between battery module 6P connector terminal No.5 and MCM connector terminal E3.
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 battery module and the MCM (E3).