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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Battery, Starting System And Charging System) >> Diagnostic Information and Procedures >> DTC B1517 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
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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