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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (HVAC - Automatic) >> Diagnostic Information and Procedures >> DTC B0193 >> 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
  2. Disconnect the electrical connector:M8 Blower Motor
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 6 & Ground
    • If 10 ohms or greater 
    1. Test for less than 2 ohms between the test points:Ground circuit terminal 6 & The other end of the circuit
      • 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 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points:B+ circuit terminal 1 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points:B+ circuit terminal 1 & 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 & Remove - Test lamp
    2. Test for infinite resistance between the test points:B+ circuit terminal 1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:M8 Blower Motor
    • Go to next step: If the test lamp turns On 
  6. Remove - Test Lamp
  7. Ignition - On / Vehicle - In Service Mode
  8. Test for less than 1 V between the test points:Control circuit terminal 2 & Ground
    • If 1 V or greater 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2 @ K33 HVAC Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:Control circuit terminal 2 @ Component harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If less than 1 V - Replace the component:K33 HVAC Control Module
    • Go to next step: If less than 1 V 
  9. Ignition/Vehicle - Off
  10. Test for infinite resistance between the test points:Control circuit terminal 2 & Ground
    • If less than infinite resistance 
    1. Disconnect the electrical connector:X2 @ K33 HVAC Control Module
    2. Test for infinite resistance between the test points:Control circuit terminal 2 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K33 HVAC Control Module
    • Go to next step: If infinite resistance 
  11. Ignition/Vehicle - Off
  12. Connect the component:M8 Blower Motor
  13. Ignition - On / Vehicle - In Service Mode
  14. Connect a DMM between the test points:Control circuit terminal 2 - Backside @ M8 Blower Motor & Ground

    Verify the DMM displays between 1 and 9 V.

    • If not between 1 and 9 V 

      Replace the component:M8 Blower Motor

    • Go to next step: If between 1 and 9 V 
  15. Operate the component:M8 Blower Motor - High Speed & Low Speed

    Verify the following information is correctly displayed:The voltage increases and decreases depending on the setting of the component.

    • If the value does not change 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2 @ K33 HVAC Control Module
    3. Test for less than 2 ohms between the test points:Control circuit terminal 2 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K33 HVAC Control Module
    • Go to next step: If the value changes 
  16. Replace the component:M8 Blower Motor
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