Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Back Door Courtesy Switch Circuit
DESCRIPTION
The fold seat control ECU receives switch operation signals, the driving condition signal and back door courtesy light switch assembly signal and operates the rear power seat according to these signals.
WIRING DIAGRAM
PROCEDURE
| 1. | CHECK BACK DOOR LOCK ASSEMBLY (BACK DOOR COURTESY LIGHT SWITCH) |
(a) Check that the back door lock assembly (back door courtesy light switch) turns on and off according to the back door operation.
OK:
Back door lock assembly (back door courtesy light switch) turns on and off normally according to the back door operation.
| NG | .gif) | GO TO LIGHTING SYSTEM |
|
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| 2. | CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - FOLD SEAT CONTROL ECU AND BODY GROUND) |
(a) Disconnect the Z7 back door lock assembly connector.
(b) Disconnect the x3*1 or y3*2 fold seat control ECU 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 |
|---|---|---|
| Z7-8 (CTY) - x3-19 (BDCY) | Always | Below 1 Ω |
| Z7-7 (E) - Body ground | Always | Below 1 Ω |
| Z7-8 (CTY) or x3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
for Rear LH Seat
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Z7-8 (CTY) - y3-19 (BDCY) | Always | Below 1 Ω |
| Z7-7 (E) - Body ground | Always | Below 1 Ω |
| Z7-8 (CTY) or y3-19 (BDCY) - Body ground | Always | 10 kΩ or higher |
| OK | | GO TO PROBLEM SYMPTOMS TABLE |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Terminals Of Ecu
TERMINALS OF ECU CHECK FOLD SEAT CONTROL ECU RH (a) Disconnect the x3 and x4 fold seat control ECU RH connectors. (b) Measure the resistance and voltage according to the value(s) in the table below. ...
Fold Seat Switch Circuit
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 fol ...
Other materials:
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Can Communication System: Check Bus 2 Line for Short to GND
DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 18 (CA4H) of the network gateway ECU and terminal 4 (CG) of the DLC3, or terminal 17 (CA4L) of the network gateway ECU and terminal 4 (CG) of the DLC3. Symptom Trouble ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Back Door System (w/ Outside Door Control Switch): How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
The power back door system troubleshooting procedure is based on the premise that the smart access system (for Entry Function) is operating normally. Check the power back door system first before troubleshooting the power back door system.
Click here
Use the foll ...
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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