DTC B2651: Reclining Sensor Malfunction [12/2019 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Driver Seat > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Check for DTCs.

   Body Electrical > Driver Seat > Trouble Codes 

   OK

   DTC B2651 is not output.

   Result

   Result	Proceed to
   DTC B2651 is not output	A
   DTC B2651 output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

B 

See step  3

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Driver Seat > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Seat Reclining	Seat reclining operation	OFF/Rear/Front	-

   Body Electrical > Driver Seat > Active Test 

   Tester Display
   Seat Reclining

   OK

   Reclining motor operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  4

1. Disconnect the g5 reclining motor (separate type front seatback spring assembly) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   g5-2 - g5-3	Reclining switch on	4.8 to 5.1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  5

1. Reconnect the g5 reclining motor (separate type front seatback spring assembly) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Reclining Motor (Separate Type Front Seatback Spring Assembly))

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   g5-2 - Body ground	Reclining motor operating	4.5 to 4.8 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - 10/2021]  , or refer to  DISASSEMBLY [10/2021 - 11/2023]  , or refer to  DISASSEMBLY [11/2023 - ] 

1. Disconnect the e25 position control ECU assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   e25-11 (SSRR) - g5-2	Always	Below 1 Ω
   e25-11 (SSRR) or g5-2 - Body ground	Always	10 kΩ or higher
   e25-12 (SGND) - g5-3	Always	Below 1 Ω
   e25-12 (SGND) or g5-3 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE RECLINING MOTOR (SEPARATE TYPE FRONT SEATBACK SPRING ASSEMBLY). Refer to  DISASSEMBLY [12/2019 - 10/2021]  , or refer to  DISASSEMBLY [10/2021 - 11/2023]  , or refer to  DISASSEMBLY [11/2023 - ] 

Result: 

OK 

See step  8

1. Disconnect the e23 and e24 position control ECU assembly connectors.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   e23-10 (RCL+) - g5-4	Always	Below 1 Ω
   e23-10 (RCL+) or g5-4 - Body ground	Always	10 kΩ or higher
   e24-6 (RCL-) - g5-1	Always	Below 1 Ω
   e24-6 (RCL-) or g5-1 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR