Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK SLIDING ROOF ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

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

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

U2-1 (B) - U2-2 (E)

P - W-B

Battery power supply

Always

11 to 14 V

U2-6 (IG) - U2-2 (E)

B - W-B

IG power supply

Engine switch off

Below 1 V

U2-6 (IG) - U2-2 (E)

B - W-B

IG power supply

Engine switch on (IG)

11 to 14 V

U2-2 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the U2 sliding roof ECU (sliding roof drive gear assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

U2-10 (OPN) - U2-2 (E)

L - W-B

Sliding roof open switch input signal

Engine switch on (IG), sliding roof open switch on

Below 1 V

U2-10 (OPN) - U2-2 (E)

L - W-B

Sliding roof open switch input signal

Engine switch on (IG), sliding roof open switch off

11 to 14 V

U2-8 (CLS) - U2-2 (E)

P - W-B

Sliding roof close switch input signal

Engine switch on (IG), sliding roof close switch on

Below 1 V

U2-8 (CLS) - U2-2 (E)

P - W-B

Sliding roof close switch input signal

Engine switch on (IG), sliding roof close switch off

11 to 14 V

U2-4 (TILT) - U2-2 (E)

G - W-B

Sliding roof tilt switch input signal

Engine switch on (IG), sliding roof tilt switch on

Below 1 V

U2-4 (TILT) - U2-2 (E)

G - W-B

Sliding roof tilt switch input signal

Engine switch on (IG), sliding roof tilt switch off

11 to 14 V

U2-9 (CLS) - U2-2 (E)

R - W-B

Roof sunshade close switch input signal

Engine switch on (IG), roof sunshade close switch on

Below 1 V

U2-9 (CLS) - U2-2 (E)

R - W-B

Roof sunshade close switch input signal

Engine switch on (IG), roof sunshade close switch off

11 to 14 V

U2-5 (OPN) - U2-2 (E)

W - W-B

Roof sunshade open switch input signal

Engine switch on (IG), roof sunshade open switch on

Below 1 V

U2-5 (OPN) - U2-2 (E)

W - W-B

Roof sunshade open switch input signal

Engine switch on (IG), roof sunshade open switch off

11 to 14 V

CHECK ROOF SUNSHADE ECU (SLIDING ROOF DRIVE GEAR ASSEMBLY)

(a) Disconnect the w1 roof sunshade ECU (sliding roof drive gear assembly) connector.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

w1-1 (+B) - w1-2 (E)

R - B

Battery power supply

Always

11 to 14 V

w1-6 (IG) - w1-2 (E)

V - B

IG power supply

Engine switch off

Below 1 V

w1-6 (IG) - w1-2 (E)

V - B

IG power supply

Engine switch on (IG)

11 to 14 V

w1-2 (E) - Body ground

B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the w1 roof sunshade ECU (sliding roof drive gear assembly) connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

w1-10 (OPN) - w1-2 (E)

G - B

Sliding roof open switch input signal

Engine switch on (IG), sliding roof open switch on

Below 1 V

w1-10 (OPN) - w1-2 (E)

G - B

Sliding roof open switch input signal

Engine switch on (IG), sliding roof open switch off

11 to 14 V

w1-8 (CLS) - w1-2 (E)

L - B

Sliding roof close switch input signal

Engine switch on (IG), sliding roof close switch on

Below 1 V

w1-8 (CLS) - w1-2 (E)

L- B

Sliding roof close switch input signal

Engine switch on (IG), sliding roof close switch off

11 to 14 V

w1-4 (VENT) - w1-2 (E)

Y - B

Sliding roof tilt switch input signal

Engine switch on (IG), sliding roof tilt switch on

Below 1 V

w1-4 (VENT) - w1-2 (E)

Y - B

Sliding roof tilt switch input signal

Engine switch on (IG), sliding roof tilt switch off

11 to 14 V

w1-9 (CLS) - w1-2 (E)

GR - B

Roof sunshade close switch input signal

Engine switch on (IG), roof sunshade close switch on

Below 1 V

w1-9 (CLS) - w1-2 (E)

GR - B

Roof sunshade close switch input signal

Engine switch on (IG), roof sunshade close switch off

11 to 14 V

w1-5 (OPN) - w1-2 (E)

BR - B

Roof sunshade open switch input signal

Engine switch on (IG), roof sunshade open switch on

Below 1 V

w1-5 (OPN) - w1-2 (E)

BR - B

Roof sunshade open switch input signal

Engine switch on (IG), roof sunshade open switch off

11 to 14 V

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

Click here

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) Panoramic moon roof system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3). When the system seems to be malfuncti ...

    Dtc Check / Clear
    DTC CHECK / CLEAR CHECK 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 / Sliding Roof or Sli ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Can Communication System: Open in One Side of Bus 4 Branch Line
    DESCRIPTION If an ECU or sensor is not displayed on the CAN Bus Check screen of the Techstream and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus lines are normal (there is no open, short, short to +B or short to GND in the main bus lines), there may be a ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > How To Troubleshoot Ecu Controlled Systems: Electronic Circuit Inspection Procedure
    ELECTRONIC CIRCUIT INSPECTION PROCEDURE BASIC INSPECTION (a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements are standard values measured at an ambient temperature of 20°C (68°F). Resistance measurements may be inaccurate if measured at high t ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.0089