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.

OK:

Voltage: 10-14 V
1. OK: Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).
  
  Fig 1: Checking Voltage Between Terminals +B And GND Of Seat Position Control ECU Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. 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.

OK:

Resistance: Continuity (below 1 Ω)

Fig 2: Checking Continuity Between Terminals GND Of Seat Position Control ECU Connector And Body Ground
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
Check POWER SEAT fuse.
1. NG: Check for short in all the harness and components connected to the POWER SEAT fuse, and repair them (See WIRING DIAGRAM ).
2. OK: Check and repair harness or connector between Seat Position Control ECU and battery.