Pinpoint Test 10: DTC B1143 - Excessive Battery Contactor Close Requests

PINPOINT TEST 10: DTC B1143 - EXCESSIVE BATTERY CONTACTOR CLOSE REQUESTS - HYBRID

Normal Operation

When the key is turned to the ON position, the PCM sends a request to the battery control module (BCM) over the controller area network (CAN) communication link to close the high-voltage traction battery (HVTB) contactors.

- DTC B1143 (Excessive Battery Contactor Close Requests) - If the PCM sends 100 requests in 4 minutes (or less) to close the HVTB contactors, the BCM sets this DTC.

Possible Causes
- Rapid key cycling/excessive contactor close requests
- CAN communication link
- PCM
- BCM
- Real-time clock

Diagnostic Procedure