Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Turn Signal Light Circuit

DESCRIPTION

The combination meter assembly controls the illumination and turning off of the rear turn signal lights.

WIRING DIAGRAM

PROCEDURE

1.

CHECK OPERATION (REAR TURN SIGNAL LIGHTS)

(a) Check the operation of the rear turn signal lights.

Result

Proceed to

LH side rear turn signal light does not illuminate

A

RH side rear turn signal light does not illuminate

B

B

GO TO STEP 5

A

2.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - REAR LIGHT ASSEMBLY LH)

(a) Disconnect the S31 rear combination light assembly LH connector.

(b) Disconnect the Z21 rear light assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S31-5 (TRN1) - Z21-4 (TRN4)

Always

Below 1 Ω

S31-5 (TRN1) or Z21-4 (TRN4) - Body ground

Always

10 kΩ or higher

S31-6 (TRN2) - Z21-5 (TRN3)

Always

Below 1 Ω

S31-6 (TRN2) or Z21-5 (TRN3) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK REAR COMBINATION LIGHT ASSEMBLY LH

(a) Interchange the rear combination light assembly LH with RH and connect the connectors.

w/ Rear No. 2 Seat: Click here

w/o Rear No. 2 Seat: Click here

NEXT

4.

CHECK OPERATION (REAR TURN SIGNAL LIGHTS)

(a) Check that the rear turn signal light of the rear combination light assembly LH illuminates.

OK:

The rear turn signal light of the rear combination light assembly LH illuminates.

OK

REPLACE REAR LIGHT ASSEMBLY LH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY LH

5.

CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - REAR LIGHT ASSEMBLY RH)

(a) Disconnect the S33 rear combination light assembly RH connector.

(b) Disconnect the Z20 rear light assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

S33-5 (TRN1) - Z20-4 (TRN4)

Always

Below 1 Ω

S33-5 (TRN1) or Z20-4 (TRN4) - Body ground

Always

10 kΩ or higher

S33-6 (TRN2) - Z20-5 (TRN3)

Always

Below 1 Ω

S33-6 (TRN2) or Z20-5 (TRN3) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CHECK REAR COMBINATION LIGHT ASSEMBLY RH

(a) Interchange the rear combination light assembly RH with LH and connect the connectors.

w/ Rear No. 2 Seat: Click here

w/o Rear No. 2 Seat: Click here

NEXT

7.

CHECK OPERATION (REAR TURN SIGNAL LIGHTS)

(a) Check that the rear turn signal light of the rear combination light assembly RH illuminates.

OK:

The rear turn signal light of the rear combination light assembly RH illuminates.

OK

REPLACE REAR LIGHT ASSEMBLY RH

NG

REPLACE REAR COMBINATION LIGHT ASSEMBLY RH

    Daytime Running Light Relay Circuit
    DESCRIPTION The main body ECU (multiplex network body ECU) controls the daytime running lights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system ...

    Hazard Warning Switch Circuit
    DESCRIPTION The combination meter assembly receives the hazard warning signal switch on signal and controls the operation of the hazard warning lights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Wireless Door Lock Control System: Parts Location
    PARTS LOCATION ILLUSTRATION *A for LED Type Turn Signal Light - - *1 HEADLIGHT ASSEMBLY RH - TURN SIGNAL LIGHT *2 HEADLIGHT ASSEMBLY LH - TURN SIGNAL LIGHT *3 SIDE TURN SIGNAL LIGHT ASSEMBLY RH *4 SIDE TURN SIGNAL LIGHT ASSEMBLY LH *5 REAR LIGHT ASSEMBLY RH - TURN ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Smart Access System With Push-button Start (for Start Function): Power Source Mode does not Change to ON (ACC)
    DESCRIPTION If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode. Related Data List and Active Test Items Problem Symptom Data List and Active Test Po ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0138