Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012CT 200H L4-1.8L (2ZR-FXE) HYBRIDREPAIR AND DIAGNOSISBODY AND FRAMEROOF AND ASSOCIATED COMPONENTSSUNROOF / MOONROOFTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESSLIDING ROOF DOES NOT MOVE BY OPERATING SLIDING ROOF CONTROL SWITCH
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) Hybrid
Sliding Roof Does Not Move By Operating Sliding Roof Control Switch
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) HybridSECTION Sliding Roof Does Not Move By Operating Sliding Roof Control Switch
SLIDING ROOF / CONVERTIBLE: SLIDING ROOF SYSTEM: Sliding Roof does not Move by Operating Sliding Roof Control Switch
- Sliding Roof does not Move by Operating Sliding Roof Control Switch
DESCRIPTION
The sliding roof ECU (sliding roof drive gear assembly) receives slide and tilt signals when the sliding roof switch is operated and drives its built-in motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.
* When the sliding roof ECU (sliding roof drive gear assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear assembly) must be initialized Programming and Relearning.
* The sliding 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 the How to Proceed with Troubleshooting procedure How To Proceed With Troubleshooting.
PROCEDURE
1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power 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.
Sliding Roof (Sliding Roof ECU (Sliding Roof Drive Gear Assembly))
OK:
The Techstream display changes according to switch operation as shown in the table.
NG -- INSPECT SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - AUXILIARY BATTERY, BODY GROUND)
(a) Disconnect the T10 sliding roof ECU (sliding roof drive gear assembly) connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) Removal
3. INSPECT SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)
(a) Remove the sliding roof switch (map light assembly) Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY) Removal
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU - SLIDING ROOF SWITCH)
(a) Disconnect the T6 sliding roof switch (map light assembly) connector.
(b) Disconnect the T10 sliding roof ECU (sliding roof drive gear assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY) Removal
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.