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Test F: Power Lumbar Inoperative

CAUTION: A Side Air Bag Simulator (418-133), must be connected, to side air bag floor connector before diagnosing or repairing power seats.
  1. On models equipped with side air bags, deactivate system before diagnosing. See appropriate AIR BAG RESTRAINT SYSTEMS article. Ensure to disconnect any auxiliary power supplies. Press inoperative seat's lumbar seat control switch to INFLATE position. If lumbar compressor runs, go to step  7 . If lumbar compressor does not run, go to next step.
  2. Operate power seat controls on seat with inoperative power lumbar system. If power seat operates, go to next step. If driver's power seat does not operate, go to TEST A: DRIVER'S POWER SEAT INOPERATIVE  . If passenger's power seat does not operate, go to TEST B: PASSENGER'S POWER SEAT INOPERATIVE  .
  3. Disconnect inoperative seat's lumbar seat control switch 2-pin connector. Measure voltage between lumbar seat control switch connector Dark Green wire terminal (Black/White wire terminal on passenger's seat) and ground. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in appropriate wire. See WIRING DIAGRAMS  .
  4. Disconnect lumbar motor 2-pin connector. Measure resistance between lumbar motor connector Black wire terminal and ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire.
  5. Connect lumbar seat control switch connector. Press and hold inoperative seat's lumbar seat control switch in INFLATE position. Measure voltage between lumbar motor Red wire terminal and ground. If voltage is more than 10 volts, replace lumbar motor. See LUMBAR MOTOR  under REMOVAL & INSTALLATION. If voltage is 10 volts or less, go to next step.
  6. Disconnect inoperative seat's lumbar seat control switch. Measure resistance of Red wire between lumbar seat control switch connector and lumbar motor connector. If resistance is less than 5 ohms, replace lumbar seat control switch. See LUMBAR SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If resistance is 5 ohms or less, repair open in Red wire. See WIRING DIAGRAMS  .
  7. Press lumbar seat control switch to INFLATE position and observe seat back lumbar adjusting pad. If lumbar adjusting pad inflates, go to step  11 . If lumbar adjusting pad does not inflate, go to next step.
  8. Visually inspect lumbar adjusting pad. If lumbar adjusting pad is damaged, replace lumbar adjusting pad. See LUMBAR ADJUSTING PAD  under REMOVAL & INSTALLATION. If lumbar adjusting pad is not damaged, go to next step.
  9. Disconnect lumbar adjusting hose from the lumbar motor. Press lumbar seat control switch to INFLATE position while feeling for air at motor hose connection. If air is felt at lumbar motor hose connection, go to next step. If air is not felt at lumbar motor hose connection, replace lumbar motor. See LUMBAR MOTOR  under REMOVAL & INSTALLATION.
  10. Connect hose to lumbar motor. Disconnect lumbar adjusting hose from lumbar seat control switch. Press lumbar seat control switch to INFLATE position. If air can be felt at lumbar adjusting hose, go to next step. If air can not be felt at lumbar adjusting hose, replace lumbar adjusting hose.
  11. Reconnect hose at lumbar seat control switch. Disconnect lumbar adjusting hose at lumbar adjusting pad. Install in-line pressure gauge on lumbar adjusting hose. Press and hold lumbar seat control switch at INFLATE position until gauge reads 5 psi (34.47 kPa). Wait 3 hours, then read gauge. If pressure reading is 4.7 psi (32.41 kPa) or more, system is operating correctly. If pressure reading is less than 4.7 psi (32.41 kPa), go to next step.
  12. Remove in-line pressure gauge. Use hand pump and inflate lumbar adjusting pad to 5 psi (34.47 kPa). Wait 3 hours, then read gauge. If pressure reading is 4.7 psi (34.47 kPa) or more, replace lumbar seat control switch. See LUMBAR SEAT CONTROL SWITCH  under REMOVAL & INSTALLATION. If pressure reading is less than 4.7 psi (34.47 kPa), replace lumbar adjusting pad. See LUMBAR ADJUSTING PAD  under REMOVAL & INSTALLATION.
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