Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Sliding Roof does not Move by Operating Sliding Roof Control Switch

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Exterior / Sliding Roof / Convertible / Sliding Roof System / Sliding Roof does not Move by Operating Sliding Roof Control Switch

DESCRIPTION

The sliding roof ECU (sliding roof drive gear sub-assembly) receives slide and tilt signals and operates its built-in motor when the sliding roof switch (map light assembly) is operated.

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the sliding roof ECU (sliding roof drive gear sub-assembly) is removed and reinstalled or replaced, the sliding roof ECU (sliding roof drive gear sub-assembly) must be initialized.

    Click here

  • The sliding roof system uses the LIN communication system. First, confirm that there are no malfunctions in the LIN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • If a sliding roof ECU (sliding roof drive gear sub-assembly) DTC is output, first perform troubleshooting for the sliding roof ECU (sliding roof drive gear sub-assembly) DTC.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(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

Open Switch

OPEN switch signal

OFF or ON

OFF: OPEN switch not pressed

ON: OPEN switch pressed

-

Close Switch

CLOSE switch signal

OFF or ON

OFF: CLOSE switch not pressed

ON: CLOSE switch pressed

-

Up Switch

UP switch signal

OFF or ON

OFF: UP switch not pressed

ON: UP switch pressed

-

Down Switch

DOWN switch signal

OFF or ON

OFF: DOWN switch not pressed

ON: DOWN switch pressed

-
Body Electrical > Sliding Roof > Data List

Tester Display

Open Switch

Close Switch

Up Switch

Down Switch

OK:

The Techstream display changes according to the operation of each switch as shown in the table.

NG

GO TO STEP 5

OK

2.

CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - BATTERY AND BODY GROUND)

(a) Disconnect the U2 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

*a

Front view of wire harness connector

(to Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly))

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

U2-1 (B) - Body ground

Always

11 to 14 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U2-2 (E) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - IG POWER SUPPLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

U2-6 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

*a

Front view of wire harness connector

(to Sliding Roof ECU (Sliding Roof Drive Gear Sub-assembly))
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)

(a) Remove the sliding roof switch (map light assembly).

Click here

(b) Inspect the sliding roof switch (map light assembly).

Click here

OK

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

NG

REPLACE SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)

5.

INSPECT SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)

(a) Remove the sliding roof switch (map light assembly).

Click here

(b) Inspect the sliding roof switch (map light assembly).

Click here

NG

REPLACE SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY)

OK

6.

CHECK HARNESS AND CONNECTOR (SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY) - SLIDING ROOF SWITCH (MAP LIGHT ASSEMBLY) AND BODY GROUND)

(a) Disconnect the U11 sliding roof switch (map light assembly) connector.

(b) Disconnect the U2 sliding roof ECU (sliding roof drive gear sub-assembly) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

U2-8 (CLS) - U11-12 (CLS)

Always

Below 1 Ω

U2-8 (CLS) or U11-12 (CLS) - Body ground

Always

10 kΩ or higher

U2-10 (OPN) - U11-11 (OPN)

Always

Below 1 Ω

U2-10 (OPN) or U11-11 (OPN) - 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

U2-5 (OPN) - U11-23 (UP)

Always

Below 1 Ω

U2-5 (OPN) or U11-23 (UP) - Body ground

Always

10 kΩ or higher

U11-19 (GND) - Body ground

Always

Below 1 Ω

U2-2 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Remote Control System does not Operate
    DESCRIPTION The main body ECU (multiplex network body ECU) receives remote control signals from the driver door key cylinder or electrical key transmitter sub-assembly. Then, the main body ECU (multip ...

    Window / Glass
    ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Wireless Door Lock Control System: Wireless Door Lock Tuner Circuit Malfunction (B1242)
    DESCRIPTION The electrical key and tire pressure monitoring system receiver assembly is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assem ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Electric Parking Brake System: Test Mode Procedure
    TEST MODE PROCEDURE REAR BRAKE PAD REPLACEMENT MODE *1 Rear Disc Brake Piston *2 Nut *a The nut moves inward in pad replacement mode HINT: When replacing the rear disc brake pad and rear disc, since the nut inside the rear disc brake cylinder assembly is in an advanced position, ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2026 Copyright www.lexusrx.net
    0.0124