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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual >> Diagnostic Information and Procedures >> DTC B3933: Air Conditioning Evaporator Temperature Sensor Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the B39 A/C Evaporator Temperature Sensor. It may take up to 10 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal B and ground.
    NOTE: The scan tool must be disconnected from the vehicle before performing the next test.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
    2. Test for less than 2 Ω in the low reference 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 less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.8-5.2 V between the signal circuit terminal A and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal 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 greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1 V between the signal 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 between 4.8-5.2 V 
  5. Replace the B39 A/C Evaporator Temperature Sensor.
  6. Verify the DTC does not set or the symptom does not occur when operating the vehicle within the Conditions for Running the DTC.
    • If the DTC or symptom is not corrected 

      Replace the K33 HVAC Control Module.

    • If the DTC or symptom is corrected 
  7. All OK.
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