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Home >> Suzuki >> 2006 >> Grand Vitara Premium, RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Heater And Ventilation) >> Diagnostic Information and Procedures >> Air Recirculation 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 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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