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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 >> DTC B1920 or B2165 >> 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.
  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. Ignition OFF, 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 terminal C1 for an open/high resistance.
  6. Connect a test lamp between the relay control circuit terminal A1 and ground.
  7. 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.
  8. Ignition OFF, disconnect the harness connector at the appropriate heated seat element.
  9. Ignition OFF, test for less than 5.0 ohms of resistance between the low reference circuit terminal C and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  10. Ignition ON, test for 9.8-10.2 volts between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  11. If all circuits test normal, test or replace the appropriate heated seat element.
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