Driver Side ECU Power Source Circuit: Procedure

1. Clear DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs B2271, B2272 and B2274.

   Result

   Result	Proceed to
   No DTC is output	A
   Any of DTCs is output	B

B → See step   5 

A: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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	11 to 14 V
   U7-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   U7-8 (SYSB) - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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 (Position Control ECU) Connector

   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 

OK → See step   4