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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 >> Hazard Lamps Malfunction >> 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.

Hazard Warning Switch = Malfunction

    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 electrical connector:S26 Hazard Warning Switch
  3. Test for less than 15 ohms between the test points:Ground circuit terminal 1 @ S26 Hazard Warning Switch & Ground
    • If 15 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 1 @ S26 Hazard Warning Switch & 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. Verify the scan tool parameter:Hazard Warning Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 2 @ S26 Hazard Warning Switch & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K9 Body Control Module
    • Go to next step: If the specified state 
  6. Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 2 @ S26 Hazard Warning Switch & Ground
  7. Verify the scan tool parameter:Hazard Warning Switch = Active
    • If not the specified state 
  8. Ignition/Vehicle - Off & Remove - Jumper wire(s)
  9. Disconnect the electrical connector:X2 @ K9 Body Control Module
  10. Ignition - On / Vehicle - In Service Mode
  11. Test for less than 1 V between the test points:Signal circuit terminal 2 @ S26 Hazard Warning Switch & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • Go to next step: If less than 1 V
  12. Test for less than 2 ohms between the test points:Signal circuit terminal 2 @ S26 Hazard Warning Switch & Signal circuit terminal 26 X2 @ K9 Body Control Module
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component:K9 Body Control Module
    • Go to next step: If the specified state 
  13. Test or replace the component:S26 Hazard Warning Switch

Hazard Warning Switch - Backlight Dimming = Malfunction

    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 electrical connector:S26 Hazard Warning Switch
  3. Test for less than 15 ohms between the test points:Ground circuit terminal 1 @ S26 Hazard Warning Switch & Ground
    • If 15 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 1 @ S26 Hazard Warning Switch & 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. Connect a test lamp between the test points:Control circuit terminal 4 @ S26 Hazard Warning Switch & Ground
  5. Ignition - On / Vehicle - In Service Mode
  6. Backlight Dimming Level - High Power
  7. Perform the scan tool control function:Hazard Lamps - Backlight Dimming - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X1 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 4 @ S26 Hazard Warning 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 4 @ S26 Hazard Warning Switch & Control circuit terminal 17 X1 @ K9 Body Control Module
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp is always On 
  9. Ignition/Vehicle - Off & Remove - Test lamp
  10. Disconnect the electrical connector:X1 @ K9 Body Control Module
  11. Ignition - On / Vehicle - In Service Mode
  12. Test for less than 1 V between the test points:Control circuit terminal 4 @ S26 Hazard Warning Switch & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If less than 1 V - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  13. Test or replace the component:S26 Hazard Warning Switch
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