2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Test A: Power Seat Inoperative

  1. If power seats diagnostic system check has been performed, go to next step. If power seats diagnostic system check has not been performed, go to POWER SEATS SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Operate power seat to full range of adjustments to verify existence of problem. If power seat is not operating properly, go to next step. If power seat operates normally, problem is intermittent. See DIAGNOSING INTERMITTENTS  .
  3. If all power seat adjusters are inoperative, go to next step. If any seat adjuster motor is operative, go to step  7 .
  4. Disconnect power seat switch harness connector. Using test light connected to ground, probe power seat switch harness connector terminal "H" (Orange wire). See Fig 1 . See WIRING DIAGRAMS  . If test light illuminates, go to next step. If test light does not illuminate, repair open circuit or short to ground in Orange wire between power seat switch harness connector terminal "H" and right instrument panel junction box harness connector.
    Fig 1: Identifying Power Seat Switch Connector Terminals
    G99J02292Courtesy of GENERAL MOTORS CORP.
  5. Connect test light between power seat switch harness connector terminals "H" (Orange wire) and "E" (Black wire). See Fig 1 . If test light does not illuminate, go to next step. If test light illuminates, go to step  7 .
  6. Check ground circuit for an open or high resistance between the power seat adjuster switch harness connector terminal "E" (Black wire) and ground terminals (located at left or right pillar post). Repair or replace as necessary. Operate power seat to verify repairs.
  7. Disconnect inoperative power seat adjuster motor harness connector. Connect test light between power seat adjuster motor harness connector terminals "A" and "B". Operate power seat switch in all directions for inoperative power seat adjuster motor(s). If test light does not illuminate, go to next step. If test light does illuminate, replace inoperative power seat adjuster motor(s). See POWER SEAT ADJUSTER MOTOR(S)  under REMOVAL & INSTALLATION.
  8. Check for open circuit or short to ground between power seat adjuster motor(s) harness connector and appropriate power seat switch harness connector terminals. If open or short circuits are not present, go to next step. If open or short circuits are present, repair or replace as necessary. Operate power seat to verify repairs.
  9. Replace power seat switch. See POWER SEAT SWITCH  under REMOVAL & INSTALLATION. Operate power seat to verify repairs.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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