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Home >> Suzuki >> 2007 >> XL7 Base, AWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater And Ventilation >> Diagnostic Information and Procedures >> DTC B0158 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the ambient air temp sensor harness connector at the ambient air temp sensor terminal A.
  2. Test for less than 1.0 Ω of resistance between the low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit for an open / high resistance. If the circuit tests normal, replace the HVAC control module.
  3. Ignition ON, test for 5 volts between the low reference circuit terminal B and the 5-volt reference signal terminal A.
    • If not the specified voltage, test the signal circuit for a short to voltage, short to ground or open/high resistance. If the circuit tests normal, replace the HVAC control module.
  4. If all circuits test normal, replace the ambient air temperature sensor.
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