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Rest H: Up/Down Lumbar Support Inoperative

  1. Using test light connected to ground, backprobe lumbar adjuster switch harness connector terminal "B" (Green/White wire). See Figure . Press and hold lumbar adjuster switch to up position. If test light illuminates, go to next step. If test light does not illuminate, replace lumbar adjuster switch. See POWER SEAT SWITCHES  under REMOVAL & INSTALLATION. Recheck system operation.
  2. Using test light connected to ground, backprobe lumbar adjuster switch harness connector terminal "A" (Pink/Black wire). See Figure . Press and hold lumbar adjuster switch to down position. If test light illuminates, go to next step. If test light does not illuminate, replace lumbar adjuster switch. See POWER SEAT SWITCHES  under REMOVAL & INSTALLATION. Recheck system operation.
  3. Using test light connected to ground, backprobe lumbar adjuster up/down relay harness connector terminal "B" (Tan wire). Press and hold lumbar switch adjuster switch to up position. If test light illuminates, go to next step. If test light does not illuminate, go to step  5 .
  4. Using test light connected to ground, backprobe lumbar adjuster up/down relay harness connector terminal "E" (Orange wire). See Fig 1 . Press and hold lumbar adjuster switch to down position. If test light illuminates, go to next step. If test light does not illuminate, go to step  6 .
  5. Using test light connected to ground, backprobe lumbar adjuster up/down relay harness connector terminal "A" (Red wire). See Fig 1 . Press and hold lumbar adjuster switch to down position. If test light illuminates, go to next step. If test light does not illuminate, replace up/down lumbar support motor. See POWER LUMBAR ASSEMBLY  under REMOVAL & INSTALLATION. Recheck system operation.
  6. Using test light connected to ground, backprobe up/down lumbar support motor harness connector terminal "B" (Tan/White wire). See Fig 1 . Press and hold lumbar adjuster switch to down position. If test light illuminates, system is okay at this time. If test light does not illuminate, replace up/down lumbar support motor.
Fig 1: Identifying Lumbar Up/Down Adjuster Relay Connector Terminals
G99H02291Courtesy of GENERAL MOTORS CORP.
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