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Park/Neutral Position Switch Circuit Test

NOTE: If driver's power seat ECU senses that the transmission is not in Park, it prevents seat from being moved to memorized position.
  1. If shift indicator light for Park position does not come on when transmission is in Park, repair indicator light before continuing. At driver's seat, remove bolts for front vertical adjuster. Lift front end of seat cushion slightly for access to driver's power seat ECU (do not lift too far; harness clamp may come loose).
  2. Remove driver's power seat ECU, but leave electrical connectors attached. Measure voltage between chassis ground and terminal No. 15 of driver's power seat ECU connector "A". See Figure.
  3. With transmission in Park, battery voltage should be present. With transmission in any other position, no voltage should be present. If voltage is not as specified, repair circuit between driver's power seat ECU and park/neutral position switch. If voltage is okay, go to next item listed under TROUBLE SHOOTING.
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