DESCRIPTION
The fold seat control ECU receives switch operation signals, the back door courtesy light switch assembly signal*1, rear door courtesy light switch assembly signal*2 and driving condition signal and operates the rear power seat according these signals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. | CHECK FOLD SEAT CONTROL ECU (PARK/NEUTRAL POSITION SWITCH SIGNAL) |
*A | for Rear RH Seat |
*B | for Rear LH Seat |
*a | Component with harness connected (Fold Seat Control ECU) |
(a) Remove the fold seat control ECU with its connectors still connected.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for Rear RH Seat Tester Connection | Condition | Specified Condition |
---|---|---|
x3-17 (P) - Body ground |
| 11 to 14 V → Below 1 V |
Engine switch off | 11 to 14 V |
Tester Connection | Condition | Specified Condition |
---|---|---|
y3-17 (P) - Body ground |
| 11 to 14 V → Below 1 V |
Engine switch off | 11 to 14 V |
OK | ![]() | GO TO PROBLEM SYMPTOMS TABLE |
|
2. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) |
(a) Disconnect the x3*1 or y3*2 fold seat control ECU connector.
(b) Disconnect the J9 main body ECU (multiplex network body 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 |
---|---|---|
x3-17 (P) - J9-16 (SFTP) | Always | Below 1 Ω |
x3-17 (P) or J9-16 (SFTP) - Body ground | Always | 10 kΩ or higher |
for Rear LH Seat
Tester Connection | Condition | Specified Condition |
---|---|---|
y3-17 (P) - J9-16 (SFTP) | Always | Below 1 Ω |
y3-17 (P) or J9-16 (SFTP) - Body ground | Always | 10 kΩ or higher |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. | CHECK FOLD SEAT CONTROL ECU |
(a) Replace the fold seat control ECU with a new or known good one.
(b) Check the operation of the rear power seat.
Click here
OK:
The rear power seat operates normally.
OK | ![]() | END (FOLD SEAT CONTROL ECU WAS DEFECTIVE) |
NG | ![]() | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Audio And Visual System (for 8 Inch Display): Does not Play even after Bluetooth Audio Mode is Selected
CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System. Click here HINT: Even if the portable player can play audio cont ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Seat Switch(for Rear Side): Components
COMPONENTS ILLUSTRATION *A for 60/40 Split Seat Type RH Side - - *1 POWER SEAT SWITCH ASSEMBLY *2 REAR POWER SEAT SWITCH RH *3 RECLINING REMOTE CONTROL BEZEL RH - - ILLUSTRATION *A for 60/40 Split Seat Type LH Side - - *1 POWER SEAT SWITCH ASSEMBLY ...