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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Lighting System) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Verification

Circuit/System Verification

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 ON, observe the scan tool Dimming Control Signal parameter while operating the dimmer switch from low to high. The parameter should move between high and low when the dimmer switch is moved up and down.
    • If the parameter does not change between the selected states, refer to Dimmer Switch Malfunction.
  2. Command the Incandescent Dimming and LED Dimming ON and OFF with a scan tool. The backlit dimming components should turn ON and OFF when changing between the commanded states.
    • If the LED backlighting components do not change between the commanded states, refer to Interior Backlighting Malfunction.
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