Pinpoint Test 12: DTC B1143 - Excessive Battery Contactor Close Requests

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PINPOINT TEST 12: 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 traction battery control module (TBCM) 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 TBCM sets this DTC.

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

Diagnostic Procedure

WARNING: Wear high-voltage insulated safety gloves and a face shield when working with high-voltage batteries or cables. The high-voltage insulated safety gloves should be of the appropriate safety and protection rating. Inspect the gloves before use and always wear them with the leather outer glove. Any hole in the rubber insulating glove is a potential entry point for high-voltage. Failure to follow these instructions may result in serious personal injury or death.

WARNING: Turn OFF the ignition switch for a minimum of 5 minutes before removing high-voltage cables. High-voltage cables and wiring are orange in color. The nominal high-voltage traction battery voltage (HVTB) is 330 V DC. Failure to follow these instructions may result in serious personal injury or death.

WARNING: Depower the high-voltage traction battery (HVTB) before carrying out any removal or installation procedures affecting the high-voltage battery system. Failure to follow this instruction may result in serious personal injury or death.

WARNING: When servicing the high-voltage system, establish a buffer zone per the specified procedure. Failure to follow this instruction may result in serious personal injury or death.

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