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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 325 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> DTC B0193: Front Blower Motor Speed >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M8 Blower Motor. It may take up to 10 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M8 Blower Motor.
    • If the test lamp illuminates 
  4. Remove the test lamp.
  5. Ignition ON. Test for less than 1 V between the control circuit terminal 2 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module. Ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K33 HVAC Control Module
    • If less than 1 V 
  6. Ignition OFF. It may take up to 10 min for all vehicle systems to power down.
  7. Test for infinite resistance between the control circuit terminal 2 and ground.
    • If less than infinite resistance 
    1. Disconnect the X2 harness connector at the K33 HVAC Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K33 HVAC Control Module
    • If infinite resistance 
    8. NOTE:

    Verify the ignition is OFF before connecting the blower motor or incorrect test results may occur.

  8. Ignition OFF, connect the harness connector at the M8 Blower Motor. Ignition ON.
  9. While backprobing terminal 2 at the M8 Blower Motor, test for greater than 1 V between control circuit and ground.
    • If less than 1 V 

      Replace the M8 Blower Motor.

    • If 1 V or greater 
  10. Verify the voltage decreases and increases while using the controls to change the blower speed selection.
    • If the voltage does not decrease and increase as the blower speed selection is changed 
    1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K33 HVAC Control Module.
    • If the voltage decreases and increases as the blower speed selection is changed 
  11. Replace the M8 Blower Motor.
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