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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Data Communications System) >> Diagnostic Information and Procedures >> DTC U1500, U1511, U1512, or U1513 >> 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.
  1. Ignition OFF, disconnect the harness connector at the RCM.
  2. Test for less than 2.0 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition ON, engine running, verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the RCM fuse is open, replace the RCM
  4. Test for 5.5 - 7.0 volts between the LIN circuit terminal 3 and ground.
    • If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, disconnect the harness connector X5 at the BCM.
  6. Ignition OFF, test for less than 5.0 ohms between the run relay coil control circuit terminal 13 and ground.
    • If greater than the specified range, test the circuit for an open/high resistance.
  7. If all circuits test normal, replace the RCM.
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