Lighting Control Panel Occ Sensor Relay Diagram

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Lexus NX manuals

Lexus NX: Taillight Relay Circuit

DESCRIPTION

Illumination of the taillights and license plate light is controlled by the main body ECU (multiplex network body ECU).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT RELAY)

(a) Using the Techstream, perform the Active Test.

Click here

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Taillight Relay

Taillight relay

ON or OFF

-

Body Electrical > Main Body > Active Test

Tester Display

Taillight Relay

Result

Proceed to

Taillights, license lights and side marker lights come on

A

Taillights, license lights and side marker lights do not come on

B
B

2.

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY)

(a) Disconnect the instrument panel junction block assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4F-1 - Body ground

Always

11 to 14 V

*a

Front view of wire harness connector

(to Instrument Panel Junction Block Assembly)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here

(b) Remove the instrument panel junction block assembly.

Click here

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

4A-37 - Battery negative (-) terminal

Battery voltage applied between terminals 4F-1 and A-14 (TRLY)

11 to 14 V

Battery voltage not applied between terminals 4F-1 and A-14 (TRLY)

Below 1 V

4A-38 - Battery negative (-) terminal

Battery voltage applied between terminals 4F-1 and A-14 (TRLY)

11 to 14 V

Battery voltage not applied between terminals 4F-1 and A-14 (TRLY)

Below 1 V

4B-24 - Battery negative (-) terminal

Battery voltage applied between terminals 4F-1 and A-14 (TRLY)

11 to 14 V

Battery voltage not applied between terminals 4F-1 and A-14 (TRLY)

Below 1 V

4B-25 - Battery negative (-) terminal

Battery voltage applied between terminals 4F-1 and A-14 (TRLY)

11 to 14 V

Battery voltage not applied between terminals 4F-1 and A-14 (TRLY)

Below 1 V

4B-25 - Battery negative (-) terminal

Battery voltage applied between terminals 4F-1 and A-14 (TRLY)

11 to 14 V

Battery voltage not applied between terminals 4F-1 and A-14 (TRLY)

Below 1 V

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