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Ecu Power Source Circuit Test

NOTE: Use this procedure to check for problems in circuit between DOME fuse and power seat ECU.
  1. 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). Remove driver's power seat ECU, but leave electrical connectors attached.
  2. Measure voltage between the following terminals of driver's power seat ECU connector. If battery voltage is present, check next item listed under TROUBLE SHOOTING.
  3. If battery voltage is not present, disconnect connector "B". Measure resistance between terminal No. 18 and ground. If resistance is one ohm or more, repair open circuit. If resistance is less than one ohm, check DOME fuse.
  4. If DOME fuse is blown, repair short to ground in circuit between DOME fuse and driver's power seat ECU, or between driver's power seat ECU and position sensors. If fuse is okay, repair circuit between battery and driver's power seat ECU.
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