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Home >> Chevrolet >> 2019 >> Express 2500 Base, Van Cargo Extended, 2.8L Eng VIN 1 >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Secondary And Configurable Customer Control System) >> Diagnostic Information and Procedures >> Steering Wheel Controls Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Savana 3500, 2018 GMC Savana 2500, 2018 Chevrolet Express 3500, and 2018 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 right steering wheel control switch.
  2. Ignition ON, test for B+ between the voltage reference circuit terminal 3 and ground.
    • If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Test for B+ between the voltage reference circuit terminal 3 and the signal circuit terminal 4.
    • If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, disconnect the X1 harness connector at the BCM.
  5. Test for infinite resistance between the signal circuit terminal 4 and ground.
    • If less than the specified value, test the signal circuit for a short to ground.
  6. If all circuits test normal, test or replace the right steering wheel control switch.
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