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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 (Automatic 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.

Headlamp Leveling Actuator = Malfunction

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: @ E13 Headlamp Assembly
  3. Test for less than 15 ohms between the test points:Ground circuit terminal 5 @ Component harness & Ground
    • If 15 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 5 @ Component harness & 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 
  4. Ignition - On / Vehicle - In Service Mode
  5. Connect a test lamp between the test points:B+ circuit terminal 11 @ 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 11 @ Component harness & 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 11 @ Component harness & B+ circuit terminal F5 @ X50A Fuse Block - Underhood
      • 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. Test or replace the component:K28 Headlamp Leveling Control Module
  7. Ignition - On / Vehicle - In Service Mode
  8. Scan Tool Device Control - Headlamp Leveling Function - Left and Right
  9. Verify operating the controls yields the expected results.
    • If the component does not activate 
    • Test or replace the component:E13 Headlamp Assembly
    • Go to next step: If all the components work properly 
  10. All OK.

B51 Suspension Height Sensor = Malfunction

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: @ B51 Suspension Height Sensor
  3. Ignition - On / Vehicle - In Service Mode
  4. Connect a test lamp between the test points:Low Reference circuit terminal 2 @ Component harness & B+
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: @ K28 Headlamp Leveling Control Module
    3. Test for less than 2 ohms between the test points:Low Reference circuit terminal 2 @ 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:K28 Headlamp Leveling Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for 4.8 to 5.2 V between the test points:5 V Reference circuit terminal 1 @ Component harness & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:@K28 Headlamp Leveling Control Module
    3. Test for infinite resistance between the test points:5 V Reference circuit terminal 1@Component harness & Ground
      • If less than infinite resistanceRepair 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:5 V Reference circuit terminal 1@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:K28 Headlamp Leveling Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: @ K28 Headlamp Leveling Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:5 V Reference circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K28 Headlamp Leveling Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  7. Verify the scan tool parameter:B51 Suspension Height Sensor = Less than 1 V
    • If 1 V or greater 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: @ K28 Headlamp Leveling Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 3 & Ground
      • If 1 V or greaterRepair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K28 Headlamp Leveling Control Module
    • Go to next step: If less than 1 V 
  8. Connect a 3 A fused jumper wire between the test points:5 V Reference circuit terminal 1 @ Component harness & Signal terminal 3 @ Component harness
  9. Engine Running
  10. Verify the scan tool parameter:B51 Suspension Height Sensor = Greater than 4.8 V
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: @ K28 Headlamp Leveling Control Module
    3. Test for infinite resistance between the test points:Signal terminal 3 @ Component harness & Ground
      • If less than infinite resistanceRepair 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:Signal terminal 3 @ Component harness & The other end of the circuit
      • If 2 ohms or greaterRepair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K28 Headlamp Leveling Control Module
    • Go to next step: If 4.8 V or greater 
  11. Test or replace the component:B51 Suspension Height Sensor
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