DESCRIPTION
When the fold seat switch assembly is operated, a switch operation signal is sent to the fold seat control ECU. According to the signal received, the fold seat control ECU operates the fold motor to perform a fold or return operation of the rear seatback.
WIRING DIAGRAM
PROCEDURE
1. | CHECK FOLD SEAT CONTROL ECU |
(a) Check the fold seat control ECU. (1) Remove the fold seat control ECU with its connectors still connected.
(2) Measure the voltage according to the value(s) in the table below. Standard Voltage: for Rear RH Seat
|
|
OK | ![]() | GO TO PROBLEM SYMPTOMS TABLE |
|
2. | INSPECT FOLD SEAT SWITCH ASSEMBLY |
(a) Remove the fold seat switch assembly.
Click here
(b) Inspect the fold seat switch assembly.
Click here
NG | ![]() | REPLACE FOLD SEAT SWITCH ASSEMBLY |
|
3. | CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH ASSEMBLY - FOLD SEAT CONTROL ECU AND BODY GROUND) |
(a) Disconnect the R31 fold seat switch assembly connector.
(b) Disconnect the x3*1 or y3*2 fold seat control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for Rear RH Seat Tester Connection | Condition | Specified Condition |
---|---|---|
R31-6 (FOLD) - x3-26 (FOLD) | Always | Below 1 Ω |
R31-6 (FOLD) or x3-26 (FOLD) - Body ground | Always | 10 kΩ or higher |
R31-1 (RTRN) - x3-25 (RTRN) | Always | Below 1 Ω |
R31-1 (RTRN) or x3-25 (RTRN) - Body ground | Always | 10 kΩ or higher |
R31-7 (E) - Body ground | Always | Below 1 Ω |
Tester Connection | Condition | Specified Condition |
---|---|---|
R31-8 (FOLD) - y3-26 (FOLD) | Always | Below 1 Ω |
R31-8 (FOLD) or y3-26 (FOLD) - Body ground | Always | 10 kΩ or higher |
R31-3 (RTRN) - y3-25 (RTRN) | Always | Below 1 Ω |
R31-3 (RTRN) or y3-25 (RTRN) - Body ground | Always | 10 kΩ or higher |
R31-7 (E) - Body ground | Always | Below 1 Ω |
OK | ![]() | REPLACE FOLD SEAT CONTROL ECU |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Automatic Transaxle System: Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) When troubleshooting On-Board Diagnostic (OBD II) vehicles, an OBD II scan tool (complying with SAE J1978) must be connected to the vehicle. Various data output from the vehicle ECM can then be read. (b) OBD II regulations require that the vehicle on-board computer i ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Steering Gear: Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE STEERING RACK BOOT CLIP (for LH Side) (a) Using pliers, remove the steering rack boot clip. 2. REMOVE STEERING RACK BOOT CLIP (for RH Side) HINT: Perform the same procedure as for the LH side. 3. REMOVE NO. 2 STEERING RACK BOOT CLAMP (for LH Side) (a) Using a screw ...