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Home >> Chevrolet >> 2019 >> Express 2500 Base, Van Cargo Extended, 2.8L Eng VIN 1 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Starting System And Charging System >> Diagnostic Information and Procedures >> DTC B1517 >> Circuit/System Testing

Circuit/System Testing

NOTE:
  • Use the schematics to verify the items listed below:
    • The control module's B+, and ground circuits.
    • The control module terminal numbers.
  • Some control module ground circuits may require up to 20 min after the ignition is turned Off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω within 1 min indicating the control modules are going to sleep.
  1. Ignition OFF, disconnect the connector(s) at the BCM.
  2. Ignition OFF, test for less than 2.0 Ω between each ground circuit terminals listed below and ground.
    • Terminal 1 X3
    • Terminal 5 X3
    • { If equipped } Terminal 9 X4
    • If not within the specified range, test the appropriate ground circuit for an open/high resistance.
  3. Ignition On, verify a test lamp illuminates between each B+ circuit terminals listed below and ground.
    • Terminal 2 X2
    • Terminal 2 X3
    • Terminal 3 X3
    • Terminal 1 X4
    • Terminal 2 X4
    • Terminal 3 X4
    • Terminal 4 X4
    • { If equipped } Terminal 10 X4
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  4. Verify voltage at each B+ circuit terminal listed below is within 1 V of the C1 Battery voltage.
    • Terminal 2 X2
    • Terminal 2 X3
    • Terminal 3 X3
    • Terminal 1 X4
    • Terminal 2 X4
    • Terminal 3 X4
    • Terminal 4 X4
    • { If equipped } Terminal 10 X4
    • If not the specified value 

      Repair the high resistance on B+ circuit.

    • Go to next step: If the specified value 
  5. Verify a test lamp illuminates between the ignition circuit terminal 19 X3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the ignition circuit for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the ignition circuit a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Replace the control module.
    • Go to next step: If the test lamp illuminates 
  6. Verify voltage at the ignition circuit terminal 19 X3 is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit.

    • Go to next step: If the specified value 
  7. Replace the BCM.
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