Front Power Seat does not Operate with Front Power Seat Switch [11/2018 - ]: Procedure

1. Check that each function of the power seat operates normally by using the front power seat switch LH.

   Refer to OPERATION CHECK [11/2018 - 12/2021] , or refer to OPERATION CHECK [12/2021 - ]

   Result

   Result	Proceed to
   All power seat functions do not operate	A
   One or more power seat functions do not operate	B

Result: 

B 

GO TO OTHER DIAGNOSIS PROCEDURE (One or more Power Seat Motors do not Operate). Refer to  One or more Power Seat Motors do not Operate [11/2018 - ]  

Result: 

A 

See step  2

1. Disconnect the position control ECU assembly connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Position Control ECU Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   T7-3 (+B) - Body ground	Power switch off	11 to 14 V
   T8-15 (SYSB) - Body ground	Power switch off	11 to 14 V
   T8-1 (IG) - Body ground	Power switch on (IG)	11 to 14 V
   T8-1 (IG) - Body ground	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Remove the front power seat switch LH.

   Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

2. Inspect the front power seat switch LH.

   Refer to INSPECTION [11/2018 - 12/2021] , or refer to INSPECTION [12/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT POWER SEAT SWITCH LH. Refer to  REMOVAL [11/2018 - 02/2019]  , or refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

OK 

See step  4

1. Disconnect the T14 front power seat switch LH connector.
2. Disconnect the T8 position control ECU assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T14-20 (E) - T8-12 (SGND)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2018 - 02/2019]  , or refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR