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Ecu Power Source Circuit Test

  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.
  2. Measure voltage (backprobe) between power seat ECU connector "B", terminals No. 9 and 11. See Figure. If battery voltage is present, return to TROUBLE SHOOTING . If battery voltage is not present, go to next step.
  3. Measure resistance (backprobe) between power seat ECU connector "B", terminal No. 11 and ground. If resistance is one ohm or more, repair open ground circuit. If resistance is less than one ohm, go to next step.
  4. Check ECU-B fuse. If ECU-B fuse is blown, locate and repair short to ground in circuit between ECU-B fuse and power seat ECU. If fuse is okay, repair open circuit between battery and power seat ECU. See WIRING DIAGRAMS .
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