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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> Body & Frame >> Seats >> Power Seat System >> Diagnostic Information and Procedures >> Lumbar Support Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate S65 seat lumbar support switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the harness connector at the S65 seat lumbar support switch and disconnect the harness connector at the Q51 seat lumbar adjuster valve assembly.
  4. Test for less than 5 Ω between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Connect a test lamp between the signal circuit terminals listed below and ground:
    • Lumbar up switch signal terminal 1
    • Lumbar rearward switch signal terminal 2
    • Lumbar down switch signal terminal 3
    • Lumbar forward switch signal terminal 4
  6. Ignition ON, press and release the S65 seat lumbar support switch in the appropriate direction. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the S65 seat lumbar support switch.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S65 seat lumbar support switch.
  7. Ignition OFF, connect the harness connector at the Q51 seat lumbar adjuster valve assembly and disconnect the harness connector at the A14 lumbar support pump.
  8. Test for less than 5 Ω between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  9. Connect a test lamp between the control circuit terminal 1 and ground.
  10. Ignition ON, command the A14 lumbar support pump ON and OFF by pressing and releasing the lumbar support switch in either the UP or FORWARD direction. 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, test or replace the Q51 seat lumbar adjuster valve assembly.
    • 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, test or replace the Q51 seat lumbar adjuster valve assembly.
  11. If all circuits test normal, test or replace the A14 lumbar support pump.
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