Driver Side ECU Power Source Circuit: Procedure

1. Disconnect the front power seat switch LH (position control ECU) connectors.
   Fig 1: Identifying Front Power Seat Switch LH Connector Terminals

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2. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   U6-5 (+B) - Body ground	Always	10 to 14 V
   U7-4 (IG) - Body ground	Engine switch on (IG)	10 to 14 V
   U7-8 (SYSB) - Body ground	Always	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying Front Power Seat Switch LH Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   U6-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE