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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 >> DTC B0158 >> 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 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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