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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 >> Headlamp Leveling Malfunction (Manual Headlamp Leveling) >> Circuit/System Testing

Circuit/System Testing

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.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector:E13 Headlamp Assembly
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 3 & Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Connect a test lamp between the test points:B+ circuit terminal 4 @ Component harness & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X5 @ X50A Fuse Block - Underhood
    3. Test for infinite resistance between the test points:B+ circuit terminal & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:B+ circuit terminal 4 @ Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:X50A Fuse Block - Underhood
    • Go to next step: If the test lamp turns On 
  6. Ignition/Vehicle & All vehicle systems - Off
  7. Disconnect the component:S30 Headlamp Switch
  8. Test for less than 15 ohms between the test points:Ground circuit terminal 8 & Ground
    • If 15 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 8 & Ground terminal
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 15 ohms 
  9. Ignition - On / Vehicle - In Service Mode
  10. Verify a test lamp turns On between the test points:B+ circuit terminal 4 @ S30 Headlamp Switch & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Remove the component:F27UA @ X50A Fuse Block - Underhood
    3. Test for infinite resistance between the test points:B+ circuit terminal 4 @ S30 Headlamp Switch & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:B+ circuit terminal 4 @ S30 Headlamp Switch & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:X50A Fuse Block - Underhood
    • Go to next step: If the test lamp turns On 
  11. Ignition/Vehicle - Off
  12. Connect the component:S30 Headlamp Switch
  13. Ignition - On / Vehicle - In Service ModeExterior Lighting - Off
  14. Test for the voltage listed below between the test points:Control circuit terminal 1 & Ground
    • Headlamp Leveling Actuator Switch - Position 0 - 10 to 11 V
    • Headlamp Leveling Actuator Switch - Position 1 - 8.5 to 9.9 V
    • Headlamp Leveling Actuator Switch - Position 2 - 8 to 9 V
    • Headlamp Leveling Actuator Switch - Position 3 - 6 to 7 V
  15. If less than the specified range 
    1. Ignition/Vehicle - Off
    2. Disconnect the component:S30 Headlamp Switch
    3. Test for infinite resistance between the test points:Control circuit terminal 9 @ S30 Headlamp Switch & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:Control circuit terminal 9 @ S30 Headlamp Switch & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:S30 Headlamp Switch
    • If greater than the specified range 
    1. Ignition/Vehicle - Off
    2. Disconnect the component:S30 Headlamp Switch
    3. Test for less than 1 V between the test points:Control circuit terminal 9 @ S30 Headlamp Switch & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:S30 Headlamp Switch
    • Go to next step: If the specified state 
  16. Test or replace the component:Headlamp Leveling Actuator
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