DESCRIPTION
If the power back door system cannot be operated using any switch, the multiplex network door ECU may not have been initialized, or there may be a malfunction in the power back door sensor assembly circuit, CAN communication system, back door closer, meter/gauge system, multiplex network door ECU power source circuit, or multiplex network door ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
PROCEDURE
1. | CHECK CUSTOMIZE SETTING |
(a) Read the customize setting "Unlock Key Twice" according to the display on the GTS.
Click here
Result | Proceed to |
---|---|
The customize setting is "OFF" | A |
The customize setting is "ON" | B |
B | ![]() | PERFORM CUSTOMIZE SETTING |
|
2. | CHECK CUSTOMIZE SETTING |
(a) Read the customize setting "Unlock 2 Operation" according to the display on the GTS.
Click here
Result | Proceed to |
---|---|
The customize setting is "OFF" | A |
The customize setting is "ON" | B |
B | ![]() | PERFORM CUSTOMIZE SETTING |
|
3. | CHECK COMBINATION METER ASSEMBLY |
(a) Check that the shift position indicator operates correctly and the speedometer indicates 0 km/h (0 mph) when the vehicle is stopped with the engine was running.
OK:
Combination meter operates normally
NG | ![]() | GO TO METER / GAUGE SYSTEM |
|
4. | CHECK FOR DTC |
(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 / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Back Door > Trouble CodesOK:
DTC is not output
NG | ![]() | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
5. | CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
Z16-20 (ECUB) - Body ground | Always | 11 to 14 V |
Z17-1 (B) - Body ground | Always | 11 to 14 V |
Z16-18 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
Engine switch off | Below 1 V |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. | READ VALUE USING TECHSTREAM (PBD MAIN SW) |
(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 |
---|---|---|---|---|
PBD Main SW | Power back door ON/OFF signal | OFF or ON | Customize setting displayed | - |
Tester Display |
---|
PBD Main SW |
OK:
The display is as specified in the normal condition column.
NG | ![]() | GO TO METER / GAUGE SYSTEM |
|
7. | READ VALUE USING TECHSTREAM (PBD TOUCH SENSOR) |
(a) Enter the following menus: Body Electrical / Back Door / Data List.
(b) 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 |
---|---|---|---|---|
PBD Touch Sensor (Right) | Power back door sensor assembly RH signal | OFF, ON or Open | OFF: Power back door sensor assembly RH not pressed ON: Power back door sensor assembly RH pressed Open: Power back door sensor assembly RH circuit open | - |
PBD Touch Sensor (Left) | Power back door sensor assembly LH signal | OFF, ON or Open | OFF: Power back door sensor assembly LH not pressed ON: Power back door sensor assembly LH pressed Open: Power back door sensor assembly LH circuit open | - |
Tester Display |
---|
PBD Touch Sensor (Right) |
PBD Touch Sensor (Left) |
Result | Proceed to |
---|---|
The values of Data List items "PBD Touch Sensor (Right)" and "PBD Touch Sensor (Left)" change to "ON" or "OFF" in accordance with the operation of the sensors. | A |
The value of Data List item "PBD Touch Sensor (Right)" does not change to "ON" or "OFF" in accordance with the operation of the power back door sensor assembly RH. | B |
The value of Data List item "PBD Touch Sensor (Left)" does not change to "ON" or "OFF" in accordance with the operation of the power back door sensor assembly LH. | C |
A | ![]() | REPLACE MULTIPLEX NETWORK DOOR ECU |
C | ![]() | GO TO STEP 10 |
|
8. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY RH |
(a) Remove the power back door sensor assembly RH.
Click here
(b) Inspect the power back door sensor assembly RH.
Click here
NG | ![]() | REPLACE POWER BACK DOOR SENSOR ASSEMBLY RH |
|
9. | CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY RH - MULTIPLEX NETWORK DOOR ECU) |
(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 |
---|---|---|
Z14-1 (OSR) - Z16-6 (OSR) | Always | Below 1 Ω |
Z14-2 (OSRE) - Z16-24 (OSE) | Always | Below 1 Ω |
Z14-1 (OSR) or Z16-6 (OSR) - Body ground | Always | 10 kΩ or higher |
Z14-2 (OSRE) or Z16-24 (OSE) - Body ground | Always | 10 kΩ or higher |
OK | ![]() | REPLACE MULTIPLEX NETWORK DOOR ECU |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
10. | INSPECT POWER BACK DOOR SENSOR ASSEMBLY LH |
(a) Remove the power back door sensor assembly LH.
Click here
(b) Inspect the power back door sensor assembly LH.
Click here
NG | ![]() | REPLACE POWER BACK DOOR SENSOR ASSEMBLY LH |
|
11. | CHECK HARNESS AND CONNECTOR (POWER BACK DOOR SENSOR ASSEMBLY LH - MULTIPLEX NETWORK DOOR ECU) |
(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 |
---|---|---|
Z3-1 (OSL) - Z16-26 (OSL) | Always | Below 1 Ω |
Z3-2 (OSLE) - Z16-24 (OSE) | Always | Below 1 Ω |
Z3-1 (OSL) or Z16-26 (OSL) - Body ground | Always | 10 kΩ or higher |
Z3-2 (OSLE) or Z16-24 (OSE) - Body ground | Always | 10 kΩ or higher |
OK | ![]() | REPLACE MULTIPLEX NETWORK DOOR ECU |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Power Window Control System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are l ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Navigation System: Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows the values or states of ...