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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> Air Temperature Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Evaporator and Ambient Air Temperature Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.
  2. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, test for 4.8-5.2 volts between the low reference circuit terminal B and the signal circuit terminal A.
    • If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  4. If all circuits test normal, test or replace the temperature sensor.

Sunload Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the sunload sensor.
  2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for high resistance.
  3. Ignition ON, test for 4.8-5.2 volts between the ground circuit terminal C and the appropriate signal circuit terminal.
    • Left sunload sensor circuit terminal A
    • Right sunload sensor circuit terminal B
    • If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  4. If all circuits test normal, test or replace the sunload sensor.

Inside Air Temperature Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the inside air temperature sensor.
  2. Ignition OFF, test for less than 10 ohms between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for high resistance.
  3. Ignition OFF, test for less than 10 ohms between the low reference circuit terminal D and ground.
    • If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  4. Ignition ON, HVAC control module ON. Verify that a test lamp illuminates between the ground circuit terminal C and the control circuit terminal B.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  5. Ignition ON, test for 4.8-5.2 volts between the low reference circuit terminal D and the signal circuit terminal A.
    • If less than the specified range, test the signal circuit for high resistance. If the circuit tests normal, replace the HVAC control module.
  6. If all circuits test normal, test or replace the inside air temperature sensor.
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