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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 63 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> Front Heated Seat Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Heated Seat Malfunction

  1. Ignition OFF, disconnect the appropriate heated seat relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C1 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the B+ circuit terminal A2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal C1 for a short to ground.
  4. Ignition OFF, test for less than 5.0 ohms of resistance between the ground circuit terminal C2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the relay control circuit terminal A1 and ground.
  6. Command the appropriate heated seat ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. Ignition OFF, disconnect the harness connector at the appropriate heated seat back element.
  8. Test for less than 5.0 ohms of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  9. Connect the harness connector at the heated seat back element.
  10. Ignition OFF, disconnect the harness connector at the appropriate heated seat cushion element.
  11. Test for less than 5.0 ohms of resistance between the voltage supply circuit terminal D and ground.
    • If greater than the specified range, test the voltage supply circuit for an open/high resistance. If the circuit tests normal, test or replace the heated seat back element.
  12. Test for less than 5.0 ohms of resistance between terminal A and terminal D.
    • If greater than the specified range, test or replace the heated seat cushion element.
  13. Connect the harness connector at the heated seat cushion element.
  14. Test for less than 5.0 ohms of resistance between the relay controlled output circuit terminal C1 and ground.
    • If greater than the specified range, test the relay controlled output circuit for an open/high resistance.
  15. If all circuits test normal, test or replace the appropriate heated seat relay.

Heated Seat Switch Malfunction

  1. Ignition ON, observe the scan tool driver heated seat parameter while turning the driver seat heater switch ON and OFF. The reading should change between OFF, LOW, and HIGH.
    • If the reading does not change as the switch is activated, replace the HVAC control module.
  2. Ignition ON, observe the driver heated seat LOW and HIGH indicators while turning the driver seat heater switch to the LOW and HIGH positions. The indicators should turn ON and OFF as the switch is activated.
    • If either the LOW or HIGH indicators does not illuminate, replace the HVAC control module.
  3. Ignition ON, observe the scan tool passenger heated seat parameter while turning the driver seat heater switch ON and OFF. The reading should change between OFF, LOW, and HIGH.
    • If the reading does not change as the switch is activated, replace the HVAC control module.
  4. Ignition ON, observe the passenger heated seat LOW and HIGH indicators while turning the passenger seat heater switch to the LOW and HIGH positions. The indicators should turn ON and OFF as the switch is activated.
    • If either the LOW or HIGH indicators does not illuminate, replace the HVAC control module.
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