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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 B2575 or B2699 >> Circuit/System Testing

Circuit/System Testing

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DTC B2575

    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:X1 @ K9 Body Control Module
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:B+ circuit terminal 2 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off
    2. Remove the component:F21DA Fuse @ X51A Fuse Block - Instrument Panel
    3. Test for less than 2 ohms between the test points:B+ circuit terminal 2 @ Control module 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 - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off
    2. Remove the component:F21DA Fuse @ X51A Fuse Block - Instrument Panel
    3. Test for infinite resistance between the test points:B+ circuit terminal 2 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition/Vehicle - Off
  6. Connect the electrical connector: @ Control module harness
  7. Ignition/Vehicle & All vehicle systems - Off
  8. Disconnect the electrical connector:X110 @ E13LA Headlamp Assembly - Left
  9. Test for less than 15 ohms between the test points:Ground circuit terminal 5 @ Component harness & Ground
    • If 15 ohms or greater 
    1. Ignition/Vehicle - Off
    2. 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 
  10. Connect a test lamp between the test points:Control circuit terminal 6 @ Component harness & Ground
  11. Ignition - On / Vehicle - In Service Mode
  12. Perform the scan tool control function:Left Low Beam/Daytime Running Lamp - 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
    2. Disconnect the electrical connector @ Control module harness
    3. Test for infinite resistance between the test points:Control circuit terminal 6X110 @ 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:Control circuit terminal 6X110 @ Component harness & Control circuit terminal 2X4 @ 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/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X4 @ Control module harness
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 6X110 @ 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 
  13. Test or replace the component:E4G Headlamp - Left Low Beam

DTC B2699

    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:X1 @ K9 Body Control Module
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points:B+ circuit terminal 3 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off
    2. Remove the component:F8DA Fuse @ X51A Fuse Block - Instrument Panel
    3. Test for less than 2 ohms between the test points:B+ circuit terminal 3 @ Control module 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 - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off
    2. Remove the component:F8DA Fuse @ X51A Fuse Block - Instrument Panel
    3. Test for infinite resistance between the test points:B+ circuit terminal 3 @ Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On 
  5. Ignition/Vehicle - Off
  6. Connect the electrical connector:X1 @ Control module harness
  7. Ignition/Vehicle & All vehicle systems - Off
  8. Disconnect the electrical connector:X120 @ E13RA Headlamp Assembly - Right
  9. Test for less than 15 ohms between the test points:Ground circuit terminal 5X120 @ Component harness & Ground
    • If 15 ohms or greater 
    1. Ignition/Vehicle - Off
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 5X120 @ 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 
  10. Connect a test lamp between the test points:Control circuit terminal 6X120 @ Component harness & Ground
  11. Ignition - On / Vehicle - In Service Mode
  12. Perform the scan tool control function:Right Low Beam/Daytime Running Lamp - 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
    2. Disconnect the electrical connector:X4 @ Control module harness
    3. Test for infinite resistance between the test points:Control circuit terminal 6X120 @ 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:Control circuit terminal 6X120 @ Component harness & Control circuit terminal 1X4 @ 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/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector:X4 @ Control module harness
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 6X120 @ 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 
  13. Test or replace the component:E4H Headlamp - Right Low Beam
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