Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

TEST FOR INTERMITTENT CONDITION
NOTE:
If the scan tool is unable to identify the vehicle, a CAN Bus concern may be present. Perform the CAN C BUS NO RESPONSE diagnostic procedure. Refer to CAN C BUS NO RESPONSE .

NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BPCM for any active CAN hardware DTCs, perform DTC before proceeding. Refer to the DTC INDEX article.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
CHECK THE MANUAL SERVICE DISCONNECT
1. Turn the ignition off.
2. Perform the HIGH-VOLTAGE POWER DOWN PROCEDURE and remove the Manual Service Disconnect. Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE .
3. Test the 300A Fuse in the Manual Service Disconnect for an open.
  Is the resistance of the 300A Fuse in the Manual Service Disconnect below 5.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Replace the Manual Service Disconnect.
  - Install the Manual Service Disconnect and perform the HIGH-VOLTAGE POWER UP PROCEDURE. Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE .
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (A902) FUSED B(+) CIRCUITS FOR AN OPEN OR SHORT CIRCUIT
1. Reinstall the Manual Service Disconnect and perform the HIGH-VOLTAGE POWER UP PROCEDURE. Refer to ELECTRIC VEHICLE CONTROL SYSTEM, STANDARD PROCEDURE .
2. Turn the ignition off.
3. Disconnect the High Voltage Battery Pack C3 low voltage harness connector.
4. Using a 12-volt test light connected to ground, check the (A902) Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Test the FTP9 15A Fuse in the Power Distribution Center 2 for an open.
  - Repair the open or short in the (A902) Fused B(+) circuit.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z900) GROUND CIRCUIT FOR AN OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z900) Ground circuits.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (Z900) Ground circuit.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D27) AND (D28) CAN C BUS CIRCUITS FOR AN OPEN
1. Turn the ignition off. Remove the key from the Ignition Switch, close the doors and allow the Electric Vehicle Control Unit (EVCU) to shut down.
  NOTE:
  Allow up to two minutes for the EVCU to shut down. Opening the vehicle door will interrupt the shut down process.
2. Disconnect the EVCU C1 harness connector.
3. Measure the resistance of the (D27) CAN C Bus (+) circuit between the EVCU C1 harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
4. Measure the resistance of the (D28) CAN C Bus (-) circuit between the EVCU C1 harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the open in the (D27) CAN C Bus (+) or (D28) CAN C Bus (-) circuit.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (H32) BATTERY PACK WAKE-UP CIRCUIT FOR AN OPEN
1. Disconnect the EVCU C2 harness connector.
2. Measure the resistance of the (H32) Battery Pack Wake-up Signal circuit between the EVCU C2 harness connector and the High Voltage Battery Pack C3 low voltage harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the High Voltage Battery Pack in accordance with the Service Information. Refer to BATTERY, HIGH-VOLTAGE, REMOVAL .
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the (H32) Battery Pack Wake-up Signal circuit.
  - Perform the BATTERY PACK CONTROL MODULE (BPCM) VERIFICATION TEST. Refer to STANDARD PROCEDURE .