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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 B0163 (UE1): Passenger Compartment Temperature Sensor >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor. It may take up to 10 min for all vehicle systems to power down.
    2. NOTE:

    The scan tool must be disconnected from the vehicle before performing the next test.

  2. Test for less than 10Ω between the low reference circuit terminal 6 and ground.
    • If 10Ω or greater 
    1. Ignition OFF, disconnect the harness connectors at the K33 HVAC Control Module.
    2. Test for less than 2Ω in the low reference 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 less than 10Ω 
  3. Ignition ON.
  4. Verify the scan tool Passenger Compartment Air Temperature (Unfiltered) parameter is less than -37°C (-35°F).
    • If -37°C (-35°F) or greater 
    1. Ignition OFF, disconnect the harness connectors at the K33 HVAC Control Module.
    2. Test for infinite resistance between the signal circuit terminal 3 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 less than -37°C (-35°F) 
  5. Install a 3A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 6.
  6. Verify the scan tool Passenger Compartment Air Temperature (Unfiltered) parameter is greater than 113°C (235°F).
    • If 113°C (235°F) or less 
    1. Ignition OFF, remove the jumper wire and disconnect the harness connectors at the K33 HVAC Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF.
    4. Test for less than 2Ω in the signal 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 greater than 113°C (235°F) 
  7. Test or replace the B10B Ambient Light/Sunload Sensor.
  8. Verify DTC B0163 does not set or the symptom does not occur while 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. 
  9. All OK.
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