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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 >> Daytime Running Lamps 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, headlamps OFF, command the Low Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.
    • If the low beam headlamps do not change between the commanded states, refer to Headlamps Malfunction .
  2. Command the DRLs ON and OFF with a scan tool. The daytime running lamps should turn ON and OFF when changing between the commanded states.
    • If the daytime running lamps do not change between the commanded states, refer to Daytime Running Lamps Malfunction.
  3. Observe the scan tool Ambient Light Status parameter while supplying sufficient light to simulate daylight conditions to the ambient light sensor. After 30 seconds, the parameter should be Day.
    • If not the specified value, refer to Ambient Light Sensor Malfunction.
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