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Home >> Suzuki >> 1987 >> Samurai Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Heater And Ventilation) >> Diagnostic Information and Procedures >> Inside Air Temperature Sensor Malfunction >> 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 appropriate temp sensor harness connector at the inside air temp sensor.
  2. Ignition OFF, test for less than 1 Ω of resistance between the ground circuit terminal C and the low reference circuit terminal D of the inside air temperature sensor.
    • If greater than the specified range, test the low reference circuit terminal D for an open/high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, verify the inside air temperature sensor parameter is greater than 215°C (419°F).
    • 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 D of the sensor. Verify the inside air temperature sensor parameter is less than -36°C (-38°F).
    • If greater than the specified range, test the signal circuit terminal A 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 inside air temperature sensor.
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