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

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

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