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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 Conditioning Compressor Malfunction >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector C2 ground circuit terminal at the HVAC control module.
  2. Ignition OFF, test for less than 1.0 Ω of resistance between the ground circuit terminal and ground.
    • If greater than 1.0 Ω, test the ground circuit for an open/high resistance.
  3. Install a 3-amp fused jumper wire between the a/c request signal circuit terminal and ground. With a scan tool, verify the A/C Request Switch parameter is ON.
    • If not On, test the a/c request signal circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the BCM.
  4. Reconnect the harness connector of the HVAC control module. With a scan tool, verify the A/C Request Switch parameter cycles between On and Off with each press of the A/C switch.
    • If the parameter does not cycle, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the HVAC control module.
  5. Remove the A/C compressor clutch relay.
  6. Verify that a test lamp illuminates between the relay coil B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  7. Verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the relay switch B+ circuit for an open/high resistance. If the A/C fuse is open, test the relay switch control circuit for a short to ground. If all circuits test normal, test or replace the A/C compressor clutch.
  8. Disconnect the harness connector at the A/C compressor clutch.
  9. Ignition OFF test for less than 1.0 Ω of resistance between the A/C compressor ground circuit and ground.
    • If greater than 1.0 Ω, test the ground circuit for an open/high resistance.
  10. Connect the harness connector at the A/C compressor clutch.
  11. Connect a 10-amp fused jumper wire between the relay switch B+ circuit and the relay switch control circuit. Verify the A/C compressor clutch engages.
    • If the A/C compressor clutch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the A/C compressor.
  12. Connect a test lamp between the relay control circuit and the relay coil B+ circuit.
  13. Using a scan tool, command the A/C relay output ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp remains ON all the time, test for a short to ground on the control circuit. If the circuit tests normal, replace the ECM.
    • If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If the circuit tests normal, replace the ECM.
  14. If all circuits test normal, test or replace the A/C compressor.
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