Pinpoint Test N: DTC B1143
High-Voltage Traction Battery
Pinpoint Test N: DTC B1143
Refer to Wiring Diagram Set 12, Charging System for schematic and connector information Electrical Diagrams.
Normal Operation
When the key is turned to the ON position, the PCM sends a request to the Battery Control Module - High Voltage Traction Battery (BCM-HVTB) 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 (High Voltage Traction Battery) contactors, the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) will set this DTC.
This pinpoint test is intended to diagnose the following:
- Rapid key cycling/excessive contactor close requests
- CAN (Controller Area Network) communication link
- PCM
- BCM-HVTB (Battery Control Module - High Voltage Traction Battery)
- Real-time clock
PINPOINT TEST N : DTC B1143
N1 CHECK FOR RAPID KEY CYCLING
NOTE: On-demand DTCs may not yield the DTC B1143. Continuous memory DTCs must be retrieved to verify that DTC B1143 is not present.
- Using the scan tool, clear the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 5 minutes.
- Enter the following diagnostic mode on the scan tool: Self Test- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).
Is DTC B1143 still present?
Yes
GO to N2.
No
RETURN the vehicle to the customer. The concern may have been caused by rapid key cycling.
N2 CHECK THE CAN (Controller Area Network) COMMUNICATION LINK
- Check the recorded BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs from the continuous and on-demand self tests.
Are any BCM-HVTB (Battery Control Module - High Voltage Traction Battery) communication link DTCs (Uxxx) present?
Yes
REFER to Information Bus to continue diagnosis of the communication network.
No
GO to N3.
N3 CHECK FOR CORRECT PCM OPERATION
- Disconnect PCM electrical connectors C175B, C175E and C175T.
- Check for:
- corrosion.
- pushed-out pins.
- Connect PCM electrical connectors C175B, C175E and C175T and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new PCM. CLEAR the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) DTCs. CYCLE the ignition switch to OFF, then ON and leave ON for 5 minutes. TEST the system for normal operation. If vehicle does not start, GO to N4.
No
GO to N4.
N4 CHECK FOR CORRECT BCM-HVTB (Battery Control Module - High Voltage Traction Battery) OPERATION
NOTE: This pinpoint test step only addresses the 40-pin connectors for the BCM-HVTB (Battery Control Module - High Voltage Traction Battery). It is not necessary to disconnect the high-voltage connectors when following this pinpoint test step procedure.
- Disconnect BCM-HVTB (Battery Control Module - High Voltage Traction Battery) electrical connector C4227A.
- Check for:
- corrosion.
- pushed-out pins.
- Connect BCM-HVTB (Battery Control Module - High Voltage Traction Battery) electrical connector C4227A and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new HVTB (High Voltage Traction Battery). REFER to High-Voltage Traction Battery . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.