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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 B3600 >> 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
  2. Disconnect the electrical connector:S30 Headlamp Switch
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for battery voltage between the test points:12 V Reference terminal 12 & Ground
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X1 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 12 @ 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:Signal circuit terminal 12 @ Component harness & Signal circuit terminal 13X1 @ 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
    • Go to next step: If battery voltage 
  5. Verify a test lamp does not turn On between the test points:Signal circuit terminal 11 & B+
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X1 @ K9 Body Control Module
    3. Test for infinite resistance between the test points:Signal circuit terminal 11 @ Component harness & 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 test lamp does not turn On 
  6. Test for battery voltage between the test points:12 V Reference terminal 12 & Signal circuit terminal 11
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2 @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Signal circuit terminal 11 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Test for less than 2 ohms between the test points:Signal circuit terminal 11 @ Component harness & Signal circuit terminal 9 @ 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
      • Go to next step: If battery voltage 
  7. Test for battery voltage between the test points:12 V Reference terminal 12 & Low Reference circuit terminal 7
    • If less than battery voltage 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X1 @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Low Reference circuit terminal 7 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Test for less than 2 ohms between the test points:Low Reference circuit terminal 7 @ Component harness & Low Reference circuit terminal 7 @ 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
    • Go to next step: If battery voltage 
  8. Verify a test lamp does not turn On between the test points:Circuit terminal 12 & Ground
    • If the test lamp turns On 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X1 @ K9 Body Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Circuit terminal 12 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 VReplace the component:K9 Body Control Module
      • Go to next step: If the test lamp does not turn On 
  9. Test or replace the component:S30 Headlamp Switch
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