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Seatback Inoperative

  1. This procedure assumes that power seat switch is in good working order. Test power seat switch. See POWER SEAT SWITCH  under COMPONENT TESTS. If power seat switch tests okay, go to next step.
  2. Operate back rest forward or backward using control button. If back rest moves forward and backward, go to next step. If back rest does not move forward and backward, go to step  4 .
  3. System is operating properly at this time. Check for poor connections or loose terminals. Repair as necessary.
  4. Remove seat from vehicle. See POWER SEAT  under REMOVAL & INSTALLATION. Connect adapter cables and breakout box to seat. See Fig 1 . Use DVOM to measure voltage between ground and Gray 14-pin connector terminal No. 1 (forward) or No. 2 (backward). Operate back rest switch forward or backward. DVOM should indicate battery voltage when the respective button is pressed. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step  10 .
  5. Disconnect drive cable from back rest motor. See SEAT MOTORS  under REMOVAL & INSTALLATION. Operate back rest switch forward or backward. If motor operates, go to next step. If motor does not operate, go to step  11 .
  6. Disconnect drive cable from drive gear. Reinstall drive cable on motor. Operate back rest adjustment switch forward or backward. Check drive cable operation. If drive cable turns, go to next step. If drive cable does not turn, go to step  12 .
  7. Check drive cable length. Measure distance between sheath sleeve and cable end. Wire should stick out at least 0.4" (10 mm). If measurement is as specified, go to next step. If measurement is not as specified, go to step  12 .
  8. Access and open drive gear assembly by removing 4 screws on drive gear housing. Check worm gear and drive. If worm and drive gears are okay, go to next step. If worm and/or drive gears are damaged, go to step  13 .
  9. Check for poor connections or loose terminals. Repair as necessary.
  10. Replace power seat control module. See SEAT CONTROL MODULE  under REMOVAL & INSTALLATION.
  11. Replace back rest motor. See SEAT MOTORS  under REMOVAL & INSTALLATION.
  12. Replace back rest adjustment cable. See SEAT MOTORS  under REMOVAL & INSTALLATION.
  13. Replace back rest drive gear assembly. See SEAT MOTORS  under REMOVAL & INSTALLATION.
Fig 1: Identifying Adapter Cables
G99F50976Courtesy of VOLVO CARS OF NORTH AMERICA.
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