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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 >> DTC B0163 or B3933 >> 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.
  1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal listed below and ground.
    • Passenger compartment temperature sensor circuit terminal D
    • Evaporator temperature sensor circuit terminal B
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, verify the appropriate scan tool Temperature Sensor parameter is greater than 215°C (419°F).
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the HVAC control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal listed below. Verify the appropriate scan tool Temperature Sensor parameter is less than -36°C (-38°F).
    • Passenger compartment temperature sensor circuit terminal D
    • Evaporator temperature sensor circuit terminal B
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  5. If all circuits test normal, test or replace the temperature sensor.
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