DTC 37
DTC 37: DC-DC Converter Temperature Signal Circuit High Input1. Reset the MCM.
2. Turn the ignition switch ON (II).
Is DTC 37 indicated?
YES- Go to step 3.
NO- Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the DC-DC converter and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF.
5. Remove the IPU lid.
6. Turn the ignition switch ON (II).
7. Measure voltage between MCM connector terminals B13 and D5.
Is there about 5 V?
YES- Go to step 8.
NO- Substitute a known-good MCM and recheck. If the symptom/indication goes away, replace the original MCM.
8. Turn the ignition switch OFF.
9. Disconnect the DC-DC converter 8P connector.
10. Turn the ignition switch ON (II).
11. Measure voltage between DC-DC converter 8P connector terminals No. 7 and No. 8.
Is there about 5 V?
YES- Replace the DC-DC converter.
NO- Go to step 12.
12. Turn the ignition switch OFF.
13. Check for continuity between DC-DC converter 8P connector terminal No. 7 and MCM converter terminal B13.
Is there continuity?
YES- Repair open in the wire between the DC-DC converter and the MCM (D5).
NO- Repair open in the wire between the DC-DC converter and the MCM (B13).