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Test G: Lumbar Support Function Does Not Work Properly

  1. Operate lumbar seat control switch to inflate position. If lumbar support compressor does not run, go to next step. If lumbar support compressor runs, go to step  8 .
  2. Operate power seat. If power seat operates, go to next step. If power seat does not operate, perform TEST A: POWER SEAT COMPLETELY INOPERATIVE  .
  3. Disconnect appropriate lumbar seat control switch harness connector. Measure voltage at Black/White wire terminal at lumbar seat control switch harness connector. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Black/White wire.
  4. Disconnect appropriate lumbar support compressor harness connector. Measure resistance between ground and Black wire terminal at lumbar support compressor harness connector. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Black wire.
  5. Connect lumbar seat control switch harness connector. Measure voltage at Red wire terminal at lumbar support compressor harness connector while operating lumbar seat control switch to inflate position. If battery voltage does not exist, go to next step. If battery voltage exists, replace lumbar support compressor.
  6. Measure resistance between ground and Red wire terminal at lumbar support compressor harness connector. If resistance is greater than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Red wire.
  7. Disconnect appropriate lumbar seat control switch harness connector. Measure resistance of Red wire between lumbar seat control switch harness connector and lumbar support compressor harness connector. If resistance is 5 ohms or less, replace lumbar seat control switch. If resistance is greater than 5 ohms, repair open in Red wire.
  8. Operate lumbar seat control switch to inflate position while observing seat back. If seat back bladder does not inflate, go to next step. If seat back bladder inflates, go to step  12 .
  9. Visually inspect lumbar support bladder. If bladder is okay, go to next step. If bladder is damaged, replace bladder.
  10. Disconnect inflate hose from lumbar support compressor. Operate lumbar seat control switch to inflate position. If air is felt from inflate port on lumbar support compressor, go to next step. If air is not felt from inflate port on lumbar support compressor, replace lumbar support compressor.
  11. Connect inflate hose to lumbar support compressor. Disconnect lumbar support bladder hose at lumbar seat control switch. Operate lumbar seat control switch to inflate position. If air is felt from inflate port at lumbar seat control switch, go to next step. If air is not felt from inflate port at lumbar seat control switch, replace inflate hose or lumbar switch as necessary.
  12. Connect lumbar support bladder hose at lumbar seat control switch (if disconnected). Disconnect inflate hose at lumbar support bladder. Connect a pressure gauge to disconnect hose. Operate lumbar seat control switch to inflate position until pressure gauge reads 5 psi (0.35 kg/cm2 ). System should hold pressure for at least 3 hours. If pressure reading is greater than 4.7 psi (0.32 kg/cm2 ) after 3 hours, go to next step. If pressure reading is 4.7 psi (0.32 kg/cm2 ) or less after 3 hours, replace leaking switch, compressor or hose as necessary.
  13. Using a hand pump, inflate lumbar support bladder to 5 psi (0.35 kg/cm2 ). Bladder should hold pressure for at least 3 hours. If pressure reading is greater than 4.7 psi (0.32 kg/cm2 ) after 3 hours, system is okay at this time. If pressure reading is 4.7 psi (0.32 kg/cm2 ) or less after 3 hours, replace lumbar support bladder.
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