Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: All Doors LOCK/UNLOCK Functions do not Operate Via Door Control Switch
DESCRIPTION
The main body ECU (multiplex network body ECU) receives switch signals from the power window regulator switch assembly on the front passenger door and activates the door lock motor on each door according to these signals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
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PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (Door Lock SW-Lock, Door Lock SW-Unlock) |
(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 / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Door Lock SW-Lock | Power window regulator switch assembly lock signal | OFF or ON | OFF: Lock side of power window regulator switch assembly not pushed ON: Lock side of power window regulator switch assembly pushed | - |
| Door Lock SW-Unlock | Power window regulator switch assembly unlock signal | OFF or ON | OFF: Unlock side of power window regulator switch assembly not pushed ON: Unlock side of power window regulator switch assembly pushed | - |
| Tester Display |
|---|
| Door Lock SW-Lock |
| Door Lock SW-Unlock |
OK:
The Techstream indicates ON or OFF according to the switch operation shown in the table.
| OK | .gif) | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
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| 2. | INSPECT POWER WINDOW REGULATOR SWITCH ASSEMBLY |
(a) Remove the power window regulator switch assembly.
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(b) Inspect the power window regulator switch assembly.
Click here
| NG | | REPLACE POWER WINDOW REGULATOR SWITCH ASSEMBLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR SWITCH ASSEMBLY -INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 2A and 2B instrument panel junction block assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| M6-7 (UL) - 2A-39 | Always | Below 1 Ω |
| M6-12 (L) - 2B-16 | Always | Below 1 Ω |
| M6-5 (GND) - Body ground | Always | Below 1 Ω |
| 2A-39 or M6-7 (UL) - Body ground | Always | 10 kΩ or higher |
| 2B-16 or M6-12 (L) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
(b) Remove the main body ECU (multiplex network body ECU).
| *a | Component without harness connected (Instrument Panel Junction Block Assembly) | - | - |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| MB-22 (UL1) - 2A-39 | Always | Below 1 Ω |
| MB-20 (L1) - 2B-16 | Always | Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
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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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