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

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Vehicle Exterior / Sliding Roof / Convertible / Sliding Roof System / Terminals Of Ecu

TERMINALS OF ECU

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

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

If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the U2 sliding roof ECU (sliding roof drive gear sub-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 motor open

Engine switch on (IG), OPEN switch on

Below 1 V

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

L - W-B

Sliding roof motor open

Engine switch on (IG), OPEN switch off

11 to 14 V

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

R - W-B

Sliding roof motor close

Engine switch on (IG), CLOSE switch on

Below 1 V

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

R - W-B

Sliding roof motor close

Engine switch on (IG), CLOSE switch off

11 to 14 V

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

W - W-B

Sliding roof motor up

Engine switch on (IG), UP switch on

Below 1 V

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

W - W-B

Sliding roof motor up

Engine switch on (IG), UP switch off

11 to 14 V

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

R - W-B

Sliding roof motor down

Engine switch on (IG), DOWN switch on

Below 1 V

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

R - W-B

Sliding roof motor down

Engine switch on (IG), DOWN switch off

11 to 14 V

If the result is not as specified, the sliding roof ECU (sliding roof drive gear sub-assembly) may be malfunctioning.

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click here

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    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of ...

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