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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 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 ohm 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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