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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 >> Stop 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, observe the scan tool Stop Lamp Switch Status parameter while pressing and releasing the brake pedal. The parameter should change between 1023 Counts and 1 Count.
    • If the parameter does not change between the commanded states, refer to Stop Lamp Switch Malfunction.
  2. Observe the left and right stop lamps while pressing and releasing the brake pedal. The stop lamps should turn ON and OFF.
    • If the left or right stop lamps do not change between the selected states, refer to the Stop Lamp Malfunction.
  3. Observe the center high mount stop lamp while pressing and releasing the brake pedal. The center high mount stop lamp should turn ON and OFF.
    • If the center high mount stop lamp does not change between the selected states, refer to Center High Mount Stop Lamp Malfunction. (cargo/passenger)
    • If the center high mount stop lamp does not change between the selected states, refer to Stop Lamp Relay Malfunction. (cutaway)
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