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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 >> DTC B2580 >> 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.
  1. Ignition/Vehicle & All vehicle systems - Off - Disconnect the electrical connector:x5 @ K9 Body Control Module - Ignition - On / Vehicle - In Service Mode
  2. Verify a test lamp turns On between the test points:Control circuit terminal 18 & Ground
    • If the test lamp does not turn On 
    1. Ignition/Vehicle - Off - Disconnect the electrical connector:x1 @ K9 Body Control Module X50A Fuse Block - Underhood
    2. Test for infinite resistance between the test points:Control circuit terminal & 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 @ Component harness & Control circuit terminal @ Control module harness
      • 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
  3. Ignition/Vehicle - OffConnect a 3 A fused jumper wire between the test points:Ground circuit terminal 18 & Ground - Ignition - On / Vehicle - In Service Mode - Low Beams - ON
  4. Verify the component turns On and Off when connecting and disconnecting the jumper wire:B+ circuit terminal V2 & Control circuit terminal

    Verify the component does not turn On and Off when connecting and disconnecting the jumper wire:High BeamHeadlamps

    • If the component does not turn On and Off 
    1. Ignition/Vehicle & All vehicle systems - Off - Disconnect the electrical connector.x1 @ X50A Fuse Block - Underhood - Ignition - On / Vehicle - In Service Mode
    2. Test for less than 1 V between the test points:Control circuit terminal 18 & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:X50A Fuse Block - Underhood
    • Go to next step: If the component turns On and Off 
  5. Replace the component:K9 Body Control Module
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