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Home >> Suzuki >> 1991 >> Samurai JS >> Repair and Diagnosis >> External Pages >> Different car >> Section 18 (Heater And Ventilation) >> Diagnostic Information and Procedures >> DTC B3933 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the evaporator temperature sensor harness connector at the evaporator temperature sensor.
  2. Ignition OFF, test for less than 1 Ω of resistance 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 volts.
    • 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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