Inspection Procedure

WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

For circuit wiring diagram, see Fig 1.

Inspect the power seat control switch. See Fig 2. If the continuity is OK, go to the next step. If the continuity is not good, replace the seat control switch. See POWER SEAT SWITCH under REMOVAL & INSTALLATION.
Check the power seat control switch and the seat position control ECU. See Fig 3. If the continuity is OK, check and replace the seat position control ECU. See POSITION CONTROL ECU ASSEMBLY under REMOVAL & INSTALLATION. If the continuity is not good, repair or replace the harness or connector.

Fig 1: Power Seat Control Switch Circuit Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Inspecting Power Seat Control Switch Continuity

Fig 3: Inspecting Control Switch & Control ECU Wiring Harness Continuity