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Home >> Suzuki >> 2008 >> XL7 Base, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating, Ventilation And A/C >> Diagnostic Information and Procedures >> DTC B3933 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the evaporator temperature sensor harness connector at the evaporator temperature sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground of the evaporator temperature sensor.
    • If greater than the specified range, test the low reference circuit terminal for an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, verify the evaporator air temperature sensor parameter is greater than 4.55 volts.
    • If less than the specified range, test the signal circuit terminal A 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 B of the sensor. Verify the evaporator air temperature sensor voltage parameter is less than 0.433 volt.
    • 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 evaporator temperature sensor.
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