Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Rear Power Window LH does not Operate with Rear Power Window Switch LH
DESCRIPTION
When the engine switch is on (IG), the power window regulator motor assembly (for rear LH door) is operated by the rear power window regulator switch assembly (for LH door). The power window regulator motor assembly (for rear LH door) has motor, regulator, and ECU functions.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
The power window control system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.
Click here
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-
If the power window regulator motor assembly (for rear LH door) has been replaced with a new one, initialize the power window control system.
Click here
- Check that the window lock switch is off before performing the following procedure.
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (MAIN BODY) |
(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 |
|---|---|---|---|---|
| Communication RL-Door Motor | Connection status between power window regulator motor assembly (for rear LH door) and main body ECU (multiplex network body ECU) | STOP or OK | STOP: Communication stopped OK: Normal communication | - |
| Tester Display |
|---|
| Communication RL-Door Motor |
OK:
OK is displayed for each Data List item above.
| NG | .gif) | GO TO LIN COMMUNICATION SYSTEM (Proceed to How to Proceed with Troubleshooting) |
|
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| 2. | READ VALUE USING TECHSTREAM (RL-DOOR MOTOR) |
(a) Enter the following menus: Body Electrical / RL-Door Motor / Data List.
(b) Read the Data List according to the display on the Techstream.
Body Electrical > RL-Door Motor > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| RL Door P/W Up SW | Rear LH door power window manual up switch signal | OFF or ON | OFF: Rear LH door power window manual up switch not being operated ON: Rear LH door power window manual up switch being operated | - |
| RL Door P/W Down SW | Rear LH door power window manual down switch signal | OFF or ON | OFF: Rear LH door power window manual down switch not being operated ON: Rear LH door power window manual down switch being operated | - |
| Tester Display |
|---|
| RL Door P/W Up SW |
| RL Door P/W Down SW |
OK:
On the Techstream screen, ON or OFF is displayed accordingly.
| NG | | GO TO STEP 4 |
|
| 3. | PERFORM ACTIVE TEST USING TECHSTREAM (RL-DOOR MOTOR) |
(a) Enter the following menus: Body Electrical / RL-Door Motor / Active Test.
(b) Perform the Active Test according to the display on the Techstream.
CAUTION:
Be careful to avoid injuries as this test causes vehicle parts to move. During the Active Test, the jam protection function will not operate.
Body Electrical > RL-Door Motor > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| Power Window | Power window | OFF / DOWN / UP | - |
| Tester Display |
|---|
| Power Window |
OK:
Rear LH door power window operates normally.
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR REAR LH DOOR) |
| 4. | INSPECT REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR LH DOOR) |
(a) Remove the rear power window regulator switch assembly (for LH door).
Click here
(b) Inspect the rear power window regulator switch assembly (for LH door).
Click here
| NG | | REPLACE REAR POWER WINDOW REGULATOR SWITCH ASSEMBLY (FOR LH DOOR) |
|
| 5. | CHECK HARNESS AND CONNECTOR (REAR POWER WINDOW REGULATOR SWITCH (FOR LH DOOR) - POWER WINDOW REGULATOR MOTOR (FOR REAR LH DOOR) AND BODY GROUND) |
(a) Disconnect the P1 power window regulator motor assembly (for rear LH door) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Q2-2 (UP) - P1-10 (UP1) | Always | Below 1 Ω |
| Q2-2 (UP) or P1-10 (UP1) - Body ground | Always | 10 kΩ or higher |
| Q2-10 (DOWN) - P1-7 (DWN1) | Always | Below 1 Ω |
| Q2-10 (DOWN) or P1-7 (DWN1) - Body ground | Always | 10 kΩ or higher |
| Q2-5 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE POWER WINDOW REGULATOR MOTOR ASSEMBLY (FOR REAR LH DOOR) |
| 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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