For 1990-2009 cars

1. Perform the Diagnostic System Check - Vehicle.
2. Remove the S51 driver's or S175 passenger's seat adjuster switch and test for serviceability. If the switch fails any tests, replace the switch.
3. Test the Y64 Driver's or the Y81 passenger's horizontal motor assembly fore and aft circuits with a test lamp and operate the appropriate part of the driver's seat adjuster switch.

⇒ | If the test lamp does not illuminate, repair or replace the appropriate circuit.

⇒ | If the test lamp illuminates, replace the appropriate seat motor.