Inspection Procedure

Check voltage between terminals +B and GND of Seat Position Control ECU connector.
PREPARATION:

Remove Seat Position Control ECU with connectors still connected.

CHECK:

Measure voltage between terminals +B and GND of Seat Position Control ECU connector.

Fig 1: Measuring Voltage Between Terminals +B & GND Of Seat Position Control ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Voltage: 10-14 V

OK: Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).

NG: Go to next step.
Check continuity between terminals GND of Seat Position Control ECU connector and body ground.
CHECK:

Measure resistance between terminals GND of Seat Position Control ECU connector and body ground.

Fig 2: Measuring Resistance Between Terminals GND Of Seat Position Control ECU Connector & Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Resistance: Continuity (below 1 Ω)

NG: Repair or replace harness or connector.

OK: Go to next step.
Check POWER SEAT fuse.
NG: Check for short in all the harness and components connected to the POWER SEAT fuse, and repair them (See attached wiring diagram).

OK: Check and repair harness or connector between Seat Position Control ECU and battery.