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Ignition Switch Circuit Test

NOTE: If power seat ECU senses that ignition is not turned on, it prevents seats from being operated.
  1. At driver's seat, remove bolts for front vertical adjuster. Lift front end of seat cushion slightly for access to power seat ECU. Remove power seat ECU, but leave wiring harness connectors attached. Measure voltage between ground and power seat ECU connector "B", terminal No. 20 (Black/Red wire). See Figure.
  2. With ignition on, battery voltage should exist. With ignition off, voltage should not exist. If voltage is as specified, see next test listed in SYSTEM TESTS INDEX  table. If voltage is not as specified, check ECU-IG (15-amp) fuse. If ECU-IG fuse is faulty, check for short to ground in Black/Red wire and replace fuse. If ECU-IG fuse is okay, repair open ignition switch circuit between power seat ECU and battery.
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