MPI/Batt Module Fan Keeps Running/Always Runs at High Speed

NOTE: Information marked with an asterisk (*) applies to BATTFANH line.

1. Turn the ignition switch OFF.
2. Remove the cargo floor mat.
3. Turn the battery module switch OFF.
4. Remove the IPU lid.
5. Disconnect BCM module connector A (26P).
Does the battery module fan run?

YES - Go to step 6.
NO - Substitute a known-good BCM module and recheck. If the symptom/indication goes away, replace the original BCM module.

6. Disconnect the low speed battery module fan control relay 4P connector and high speed battery module fan control relay 4P connector.





7. Check for continuity between body ground and BCM module connector terminal A11 and A24 *.
Is there continuity?

YES - Repair short in the wire between the BCM module (A11, A24*) and the low (high)* speed battery module fan control relay.
NO - Go to step 8.

8. Check the low (high)* speed battery inverter module fan control relay .
Is relay OK?

YES - Repair short in the wire between the battery module fan and high speed battery module fan control relay.

NO - Replace the battery module.