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 seat memory switch. See Fig 2. If the results are OK, go to the next step. If the results are not good, replace the seat memory switch.
Check the seat memory switch and seat position control ECU wiring harnesses. See Fig 3. If the continuity is OK, check and replace the position control ECU assembly. See POSITION CONTROL ECU ASSEMBLY under REMOVAL & INSTALLATION. If the continuity is not good, check and replace the harness and connector.

Fig 1: Memory Switch Circuit Wiring Diagram

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Fig 2: Inspecting Seat Memory Switch Continuity

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