Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Panoramic Moon Roof System does not Operate
DESCRIPTION
The sliding roof ECU (sliding roof drive gear assembly) and roof sunshade ECU (sliding roof drive gear assembly) receive each other's position information from the main body ECU (multiplex network body ECU) via LIN communication.
The sliding roof ECU (sliding roof drive gear assembly) and roof sunshade ECU (sliding roof drive gear assembly) receive signals from each switch, and operate their built-in motors.
For the linked functions of the sliding roof and roof sunshade refer to Operation Check.
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WIRING DIAGRAM
Refer to SYSTEM DIAGRAM.
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CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
The sliding roof auto operation function can be customized. Make sure that the function is set to ON.
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If the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear assembly) or roof sunshade ECU (sliding roof drive gear assembly) must be initialized.
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The panoramic moon roof system uses the CAN and LIN communication systems. First, confirm that there are no malfunctions in the CAN and LIN communication systems. Refer to How to Proceed with Troubleshooting.
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If a sliding roof ECU (sliding roof drive gear assembly) DTC is output,perform troubleshooting for the DTC first.
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PROCEDURE
| 1. | CHECK FOR DTC (MAIN BODY) |
(a) Clear the DTCs.
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(b) Check for DTCs.
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OK:
DTCs B1273 and B2329 are not output.
| NG | .gif) | GO TO LIN COMMUNICATION SYSTEM (Proceed to How to Proceed with Troubleshooting) |
|
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| 2. | CHECK FOR DTC (SLIDING ROOF AND SLIDING SUNSHADE) |
(a) Clear the DTCs.
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(b) Check for DTCs.
Click here
OK:
DTCs B2341 and B2344 are not output.
| NG | | GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
| 3. | CHECK POWER WINDOW CONTROL SYSTEM |
(a) Check the power window control system operates normally.
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OK:
The power window control system operates normally.
| NG | | GO TO POWER WINDOW CONTROL SYSTEM |
|
| 4. | READ VALUE USING TECHSTREAM (SLIDING ROOF) |
(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 / Sliding Roof / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Sliding Roof > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Vent Switch | Sliding roof tilt switch signal | OFF or ON | OFF: Sliding roof switch not pressed ON: Sliding roof switch pressed | - |
| Roof Open Switch | Sliding roof open switch signal | OFF or ON | OFF: Sliding roof switch not slid backward ON: Sliding roof switch slid backward | - |
| Roof Close Switch | Sliding roof close switch signal | OFF or ON | OFF: Sliding roof switch not slid forward ON: Sliding roof switch slid forward | - |
| Shade Close Switch | Roof sunshade close switch signal | OFF or ON | OFF: Roof sunshade switch not slid forward ON: Roof sunshade switch slid forward | - |
| Shade Open Switch | Roof sunshade open switch signal | OFF or ON | OFF: Roof sunshade switch not slid backward ON: Roof sunshade switch slid backward | - |
| Tester Display |
|---|
| Vent Switch |
| Roof Open Switch |
| Roof Close Switch |
| Shade Close Switch |
| Shade Open Switch |
OK:
The Techstream display changes according to switch operation as shown in the table.
| NG | | GO TO STEP 8 |
|
| 5. | READ VALUE USING TECHSTREAM (SLIDING SUNSHADE) |
(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 / Sliding Sunshade / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Sliding Sunshade > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Vent Switch | Sliding roof tilt switch signal | OFF or ON | OFF: Sliding roof switch not pressed ON: Sliding roof switch pressed | - |
| Roof Open Switch | Sliding roof open switch signal | OFF or ON | OFF: Sliding roof switch not slid backward ON: Sliding roof switch slid backward | - |
| Roof Close Switch | Sliding roof close switch signal | OFF or ON | OFF: Sliding roof switch not slid forward ON: Sliding roof switch slid forward | - |
| Shade Close Switch | Roof sunshade close switch signal | OFF or ON | OFF: Roof sunshade switch not slid forward ON: Roof sunshade switch slid forward | - |
| Shade Open Switch | Roof sunshade open switch signal | OFF or ON | OFF: Roof sunshade switch not slid backward ON: Roof sunshade switch slid backward | - |
| Tester Display |
|---|
| Vent Switch |
| Roof Open Switch |
| Roof Close Switch |
| Shade Close Switch |
| Shade Open Switch |
OK:
The Techstream display changes according to switch operation as shown in the table.
| OK | | USE SIMULATION METHOD TO CHECK |
|
| 6. | INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly.
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(b) Inspect the map light assembly.
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| NG | | REPLACE MAP LIGHT ASSEMBLY |
|
| 7. | CHECK HARNESS AND CONNECTOR (ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) - MAP LIGHT ASSEMBLY AND BODY GROUND) |
(a) Disconnect the w1 roof sunshade ECU (sliding roof drive gear assembly) connector.
(b) Disconnect the U2 sliding roof ECU (Sliding roof drive gear assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| w1-10 (OPN) - U11-11 (OPN) | Always | Below 1 Ω |
| w1-10 (OPN) or U11-11 (OPN) - Body ground | Always | 10 kΩ or higher |
| w1-8 (CLS) - U11-12 (CLS) | Always | Below 1 Ω |
| w1-8 (CLS) or U11-12 (CLS) - Body ground | Always | 10 kΩ or higher |
| w1-4 (VENT) - U11-7 (B) | Always | Below 1 Ω |
| w1-4 (VENT) or U11-7 (B) - Body ground | Always | 10 kΩ or higher |
| w1-5 (OPN) - U11-23 (UP) | Always | Below 1 Ω |
| w1-5 (OPN) or U11-23 (UP) - Body ground | Always | 10 kΩ or higher |
| w1-9 (CLS) - U11-24 (DOWN) | Always | Below 1 Ω |
| w1-9 (CLS) or U11-24 (DOWN) - Body ground | Always | 10 kΩ or higher |
| w1-2 (E) - Body ground | Always | Below 1 Ω |
| U11-19 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. | INSPECT MAP LIGHT ASSEMBLY |
(a) Remove the map light assembly.
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(b) Inspect the map light assembly.
Click here
| NG | | REPLACE MAP LIGHT ASSEMBLY |
|
| 9. | CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) - MAP LIGHT ASSEMBLY AND BODY GROUND) |
(a) Disconnect the w1 roof sunshade ECU (sliding roof drive gear assembly) connector.
(b) Disconnect the U2 sliding roof ECU (sliding roof drive gear assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| U2-10 (OPN) - U11-11 (OPN) | Always | Below 1 Ω |
| U2-10 (OPN) or U11-11 (OPN) - Body ground | Always | 10 kΩ or higher |
| U2-8 (CLS) - U11-12 (CLS) | Always | Below 1 Ω |
| U2-8 (CLS) or U11-12 (CLS) - Body ground | Always | 10 kΩ or higher |
| U2-4 (TILT) - U11-7 (B) | Always | Below 1 Ω |
| U2-4 (TILT) or U11-7 (B) - Body ground | Always | 10 kΩ or higher |
| U2-5 (OPN) - U11-23 (UP) | Always | Below 1 Ω |
| U2-5 (OPN) or U11-23 (UP) - Body ground | Always | 10 kΩ or higher |
| U2-9 (CLS) - U11-24 (DOWN) | Always | Below 1 Ω |
| U2-9 (CLS) or U11-24 (DOWN) - Body ground | Always | 10 kΩ or higher |
| U2-2 (E) - Body ground | Always | Below 1 Ω |
| U11-19 (GND) - Body ground | Always | Below 1 Ω |
| OK | | REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) |
| 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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