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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> DTC B0193: Front Blower Motor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the K8 Blower Motor Control Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10Ω between the ground circuit terminal 5 and ground.
    • If 10Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 10Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 6 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 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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 terminal 6 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the X2 harness connector at the K8 Blower Motor Control Module and disconnect the harness connector at the M8 Blower Motor.
    4. Test for infinite resistance between the M8 Blower Motor B+ circuit terminal B and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the M8 Blower Motor.
    • If the test lamp illuminates 
  5. Remove the test lamp.
  6. Verify the resistance between the control circuit terminal 3 and ground varies from 500Ω to 230KΩ while changing blower speeds.
    • If the resistance does not change from 500Ω to 230KΩ 
    1. Ignition OFF, disconnect the X2 harness connector at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. 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.
    4. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω replace the K33 HVAC Control Module.
    • If the resistance does change from 500Ω to 230KΩ 
  7. Ignition OFF, connect the X1 harness connector at the K8 Blower Motor Control Module and disconnect the harness connector at the M8 Blower Motor, ignition ON and blower ON.
  8. Verify a test lamp illuminates between the B+ terminal B and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X2 harness connector at the K8 Blower Motor Control Module.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω replace the K8 Blower Motor Control Module.
    • If the test lamp illuminates 
  9. Connect a test lamp between the B+ circuit terminal B and control circuit terminal A, ignition ON.
    10. NOTE:

    Once the highest fan speed is reached the test lamp may not decrease intensity with a commanded decrease in fan speed, and in order to perform the test again you must first move the fan speed command back to low then OFF.

  10. Verify the test lamp becomes progressively brighter as the blower speed is increased and progressively dimmer as the blower speed is decreased.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp and disconnect the X2 harness connector at the K8 Blower Motor Control Module, ignition ON.
    2. Test for less than 1V between the control circuit terminal 2 and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Test for less than 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω replace the K8 Blower Motor Control Module.
    • If the test lamp illuminates, but does not change in brightness 
    1. Ignition OFF, remove the test lamp and disconnect the X2 harness connector at the K8 Blower Motor Control Module.
    2. Test for infinite resistance between the control circuit terminal 2 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K8 Blower Motor Control Module.
    • If the test lamp changes in brightness as the blower speed is changed 
  11. Test or replace the M8 Blower Motor.
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