DTC 62

DTC 62: Bypass Contactor Problem
1. Reset the MCM.
2. Turn the ignition switch ON (II), and turn off all accessories that create load: headlights, blower fan, rear defogger and air conditioner are not operating.
Is DTC 62 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, bypass contactor and at the MCM.
3. Turn the ignition switch OFF.
4. Turn the battery module switch OFF, and wait 5 minutes.
5. Remove the IPU lid, and make sure there is 30 V or less at the junction terminals.
6. Disconnect the DC-DC converter 8P connector.
7. Turn the battery module switch ON.
8. Turn the ignition switch ON (II).
Is DTC 62 indicated ?
YES- Go to step 12.
NO- Go to step 9.
9. Turn the ignition switch OFF.





10. Connect the DC-DC converter 8P connector terminal No. 6 and body ground with a jumper wire.





11. Check for continuity between body ground and the MCM connector terminal A27.
Is there continuity?
YES- Repair open in high voltage line. If the line OK, replace these items:
^ Substitute a known-good MCM and BCM module, and recheck. If the symptom/indication goes away, replace the original MCM and BCM module.
^ Battery module.
^ DC-DC converter.
NO- Repair open in the wire between the DC-DC converter and the MCM (A27).
12. Turn the ignition switch OFF.
13. Disconnect the junction board 16P connector.
14. Turn the battery module switch OFF.
15. Remove the IPU lid.





16. Connect a voltmeter between the junction board 16P connector terminals No. 7 and No. 10, then turn the ignition switch ON (II).
Is there battery voltage momentarily?
YES-
^ Replace the battery module.
^ Substitute a known-good MCM and BCM module, and recheck. If the symptom/indication goes away, replace the original MCM and BCM module.
NO- Go to step 17.
17. Turn the ignition switch OFF.





18. Measure voltage between MCM connector terminals AS and A10, then turn the ignition switch ON (II).
Is there battery voltage momentarily?
YES- Repair open in the wire between the junction board 16Pconnector and the MCM (A8).
NO-
^ Replace the MPI module and voltage converter module.
^ Replace the battery module.