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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Lighting System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the scan tool parameter:Automatic Headlamps Disable Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  3. Operate the component:S30 Headlamp Switch - Off

    Verify the scan tool parameter:Automatic Headlamps Disable Switch = Inactive

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  4. Verify the scan tool parameter:Park Lamps = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  5. Operate the component:S30 Headlamp Switch - Park Lamps

    Verify the scan tool parameter:Park Lamps = Inactive

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  6. Verify the scan tool parameter:Headlamps On Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  7. Operate the component:S30 Headlamp Switch - Headlamp

    Verify the scan tool parameter:Headlamps On Switch = Active

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 1

    • Go to next step: If the specified state 
  8. Verify the scan tool parameter:Headlamps Flash Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the specified state 
  9. Operate the component: - S78 Turn Signal/Multifunction Switch - Headlamps Flash Switch

    Verify the scan tool parameter:Headlamps Flash Switch = Active

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the specified state 
  10. Verify the scan tool parameter:High Beam Select Switch = Inactive
    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the specified state 
  11. Operate the component: - S78 Turn Signal/Multifunction Switch - High Beam Select Switch

    Verify the scan tool parameter:High Beam Select Switch = Active

    • If not the specified state 

      Refer to: Circuit/System Testing - Test 2

    • Go to next step: If the specified state 
  12. Perform the scan tool control function:Low Beam Lamps - On and Off

    Verify the component turns On and Off :Low Beams

    • If the component does not turn On and Off 

      Refer to: Circuit/System Testing

    • { With T4F } - Test 4
    • { With T4A } - Test 5
    • Go to next step: If the component turns On and Off 
  13. Perform the scan tool control function:High Beams - On and Off

    Verify the component turns On and Off: High Beams

    • If the component does not turn On and Off 

      Refer to: Circuit/System TestingTest 6

    • Go to next step: If the component turns On and Off 
  14. Perform the scan tool control function:All Indicators Command - On and Off

    Verify the component turns On and Off: High Beam - Indicators @ P16 Instrument Cluster

    • If the component does not activate 

      Replace the component:P16 Instrument Cluster

    • Go to next step: If the component turns On and Off 
  15. { With TQ5 } Operate the component: - S78 Turn Signal/Multifunction Switch - Automatic High Beam Switch - On and Off

    Verify the component turns On and Off: Automatic High Beam Activation Status - Indicators @ P16 Instrument Cluster

    • If the component does not activate 

      Refer to:Test 3

    • Go to next step: If the component activates 
  16. All OK.
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