Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Folding Motor Circuit
DESCRIPTION
HINT:
- The rear power seat switch is a collective term for the rear power seat switch RH and the rear power seat switch LH.
- The rear seatback frame sub-assembly is a collective term for the rear seatback frame sub-assembly RH and the rear seatback frame sub-assembly LH.
The fold seat control ECU receives switch operation signals from the rear power seat switch and fold seat switch assembly operates the fold motor according to the received signal. While the fold motor is operating, its built-in Hall IC detects the position of the rear seatback and sends a fold motor position sensor signal to the fold seat control ECU. The fold seat control ECU uses the Hall IC to detect abnormalities, such as if the rear seatback is jammed.
WIRING DIAGRAM
PROCEDURE
| 1. | INSPECT REAR SEATBACK FRAME SUB-ASSEMBLY (FOLD MOTOR) |
(a) Remove the rear seatback frame sub-assembly.
-
for Rear LH Seat: Click here
.gif)
-
for Rear RH Seat: Click here
(b) Inspect the rear seatback frame sub-assembly (fold motor).
-
for Rear LH Seat: Click here
-
for Rear RH Seat: Click here
| NG | .gif) | REPLACE REAR SEATBACK FRAME SUB-ASSEMBLY |
|
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| 2. | CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - FOLD MOTOR) |
(a) Disconnect the x3*1 or y3*2 and x4*1 or y4*2 fold seat control ECU (rear RH seat) connectors.
- *1: for Rear RH Seat
- *2: for Rear LH Seat
(b) Disconnect the x2*1 or y1*2 fold motor connector.
- *1: for Rear RH Seat
- *2: for Rear LH Seat
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for Rear RH Seat
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| x3-11 (SV1) - x2-5 (HLV) | Always | Below 1 Ω |
| x3-11 (SV1) or x2-5 (HLV) - Body ground | Always | 10 kΩ or higher |
| x3-10 (SFLD) - x2-2 (HLS) | Always | Below 1 Ω |
| x3-10 (SFLD) or x2-2 (HLS) - Body ground | Always | 10 kΩ or higher |
| x3-8 (SG1) - x2-6 (HLG) | Always | Below 1 Ω |
| x3-8 (SG1) or x2-6 (HLG) - Body ground | Always | 10 kΩ or higher |
| x4-4 (FLD+) - x2-3 (FWD) | Always | Below 1 Ω |
| x4-4 (FLD+) or x2-3 (FWD) - Body ground | Always | 10 kΩ or higher |
| x4-8 (FLD-) - x2-4 (BACK) | Always | Below 1 Ω |
| x4-8 (FLD-) or x2-4 (BACK) - Body ground | Always | 10 kΩ or higher |
for Rear LH Seat
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| y3-11 (SV1) - y1-5 (HLV) | Always | Below 1 Ω |
| y3-11 (SV1) or y1-5 (HLV) - Body ground | Always | 10 kΩ or higher |
| y3-10 (SFLD) - y1-2 (HLS) | Always | Below 1 Ω |
| y3-10 (SFLD) or y1-2 (HLS) - Body ground | Always | 10 kΩ or higher |
| y3-8 (SG1) - y1-6 (HLG) | Always | Below 1 Ω |
| y3-8 (SG1) or y1-6 (HLG) - Body ground | Always | 10 kΩ or higher |
| y4-4 (FLD+) - y1-3 (FWD) | Always | Below 1 Ω |
| y4-4 (FLD+) or y1-3 (FWD) - Body ground | Always | 10 kΩ or higher |
| y4-8 (FLD-) - y1-4 (BACK) | Always | Below 1 Ω |
| y4-8 (FLD-) or y1-4 (BACK) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK REAR SEATBACK FRAME SUB-ASSEMBLY (POSITION SENSOR) |
(a) Temporarily replace the rear seatback frame sub-assembly with a new or known good one.
-
for Rear LH Seat: Click here
-
for Rear RH Seat: Click here
(b) Check the operation of the rear power seat.
Click here
| OK | | END (REAR SEATBACK FRAME SUB-ASSEMBLY WAS DEFECTIVE) |
| NG | | REPLACE FOLD SEAT CONTROL ECU |
Power Source Circuit
DESCRIPTION Power is supplied to the fold seat control ECU through the ECU-DCC NO. 2, P/SEAT R/R*1, P/SEAT R/L*2 and ECU-IG1 NO. 4 fuses.
*1: for Rear Right Seat
*2: for Rear Left Seat
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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