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Home >> Buick >> 2014 >> Verano Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (HVAC System - Manual) >> Diagnostic Information and Procedures >> DTC B0193 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the K8 blower motor control module. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the ground circuit terminal 5 and ground.
    • If 5 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 5 Ω 
  3. Ignition ON, verify a test lamp illuminates between B+ circuit terminal 6 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    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.
    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, replace the K8 blower motor control module.
    • If the test lamp illuminates 
  4. Connect a DMM between the control circuit X2 terminal 3 and ground.
  5. Verify the resistance value is between 10 K Ω and 180 K Ω and there is a noticeable change when moving between the commanded fan speeds.
    • If not within the specified range or there is no noticeable change 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC control module.
    2. Test for less than 1 V between the control circuit terminal 3 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    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 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 within the specified range and there is a noticeable change 
  6. Disconnect the X1 harness connector at the K8 blower motor control module.
  7. Connect a 30 A fused jumper between the B+ circuit terminal 1 and B+, and a jumper between the ground circuit terminal 2 and ground.
  8. Verify the blower motor operates.
    • If the blower motor does not operate 

      Replace the M8 blower motor.

    • If the blower motor operates 
  9. Replace the K8 blower motor control module
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