Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Back Door Courtesy Switch Circuit
DESCRIPTION
The multiplex network door ECU receives the courtesy light switch signal from the back door lock assembly and transmits it to the main body ECU (multiplex network body ECU) via CAN communication.
WIRING DIAGRAM
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Back Door / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Back Door > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Courtesy SW | Latch courtesy switch signal | ON or OFF | ON: Back door open OFF: Back door closed | - |
| Tester Display |
|---|
| Courtesy SW |
OK:
Normal conditions listed above are displayed.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
| 2. | INSPECT BACK DOOR LOCK ASSEMBLY |
(a) Remove the back door lock assembly.
Click here .gif)
(b) Inspect the back door courtesy switch built in the back door lock assembly.
Click here
OK:
Back door lock assembly is normal.
| NG | | REPLACE BACK DOOR LOCK ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK ASSEMBLY - MULTIPLEX NETWORK DOOR ECU AND BODY GROUND) |
(a) Disconnect the Z16 multiplex network door ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Z7-8 - Z16-11 (FUL) | Always | Below 1 Ω |
| Z7-8 or Z16-11 (FUL) - Body ground | Always | 10 kΩ or higher |
| Z7-7 - Body ground | Always | Below 1 Ω |
| OK | | REPLACE MULTIPLEX NETWORK DOOR ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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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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