LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Lighting System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Backup 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.
    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 - Disconnect the electrical connector. @ E5 Backup Lamp = Inoperative
  2. Test for less than 10 ohms between the test points:Ground circuit terminal B & Ground
    • If 10 ohms or greater 
    1. Ignition Off
    2. Test for less than 2 ohms between the test points:Ground circuit terminal B & Ground
      • 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 
  3. Connect a test lamp between the test points:Control circuit terminal A & Ground - Ignition - On / Vehicle - In Service Mode
  4. Perform the scan tool control function:Backup Lamps - On and Off - Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp - Disconnect the electrical connector.X7 @ K9 Body Control Module
    2. Test for infinite resistance between the test points:Control circuit terminal A & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 ohms between the test points:Control circuit terminal A @ Component harness & Terminal 2 X7 @ Control module harness
      • 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
    • If the test lamp is always On 
    1. Ignition Off - Disconnect the electrical connector:X7 @ K9 Body Control Module - Ignition - On / Vehicle - In Service Mode
    2. Test for less than 1 V between the test points:Control circuit terminal A @ Component harness & 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 
  5. Test or replace the component:E5 Backup Lamp = Inoperative
scientia non olet · About LEMON Manuals