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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 >> Air Recirculation Malfunction >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the recirculation actuator.
  2. Ignition OFF, test for less than 1.0 Ω of resistance between the low reference circuit terminal 1 and ground.
    • If greater than 1.0 Ω, 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 4.8 to 5.2 volts between the 5 -volt reference circuit terminal 3 and ground.
    • If less than 4.8 volts, test the 5 -volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
    • If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module.
  4. Install a 3-amp fused jumper wire at the signal circuit terminal 2, test for greater than 5 volts. Toggle the jumper wire between the low reference circuit terminal 1 and the 5-volt reference circuit terminal 3.
    • If the position signal parameter is less than 5 volts, 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. Ignition ON, after 30 seconds verify that a test lamp illuminates between control circuit A terminal 4 and B+.
    • If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test the B+ circuit of the HVAC control module for a short to ground, high resistance, or an open. If the circuit tests normal, test the HVAC control module ground circuit for a high resistance or an open. If the circuit tests normal, replace the HVAC control module.
  6. Ignition OFF, verify that a test lamp does not illuminate between control circuit A terminal 4 and B+.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal replace the HVAC control module.
  7. Ignition ON, after 30 seconds verify that a test lamp illuminates between control circuit B terminal 5 and B+.
    • If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test the B+ circuit of the HVAC control module for a short to ground, high resistance, or an open. If the circuit tests normal, test the HVAC control module ground circuit for a high resistance or an open. If the circuit tests normal, replace the HVAC control module.
  8. Ignition OFF, verify that the test lamp does not illuminate between control circuit B terminal 5 and B+.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal replace the HVAC control module.
  9. If all circuits test normal, replace the recirculation actuator.
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