Lexus NX: Daytime Running Light Relay Circuit

DESCRIPTION

The illumination of the daytime running light (clearance light assembly) or clearance light is controlled by the headlight light control ECU sub-assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT)

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

Click here

Body Electrical > Main Body > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Daytime Running Light

Illuminates daytime running lights

ON or OFF

-

Body Electrical > Main Body > Active Test

Tester Display

Daytime Running Light

Result

Proceed to

The Active Test is performed normally

A

The Active Test is not performed normally for the right side light only

B

The Active Test is not performed normally for the left side light only

C

A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

GO TO STEP 5

B

2.

INSPECT NO. 1 DAYTIME RUNNING LIGHT RELAY (DRL RH)

(a) Remove the No. 1 daytime running light relay from the No. 2 engine room relay block.

(b) Inspect the No. 1 daytime running light relay.

Click here

NG

REPLACE NO. 1 DAYTIME RUNNING LIGHT RELAY (DRL RH)

OK

3.

CHECK HARNESS AND CONNECTOR (NO. 1 DAYTIME RUNNING LIGHT RELAY [DRL RH] - BATTERY)

(a) Remove the No. 1 daytime running light relay from the No. 2 engine room relay block.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

No. 1 daytime running light relay terminal 5 - Body ground

Power switch off

11 to 14 V

No. 1 daytime running light relay terminal 1 - Body ground

*a

Front view of wire harness connector

(to No. 1 Daytime Running Light Relay [DRL RH])

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (NO. 1 DAYTIME RUNNING LIGHT RELAY [DRL RH] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

(a) Remove the No. 1 daytime running light relay from the No. 2 engine room relay block.

(b) Remove the instrument panel junction block assembly.

(c) Disconnect the I47 instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 2 - I47-22 (DRL)

Always

Below 1 Ω

Relay terminal 2 or I47-22 (DRL) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT NO. 2 DAYTIME RUNNING LIGHT RELAY (DRL LH)

(a) Remove the No. 2 daytime running light relay from the No. 2 engine room relay block.

(b) Inspect the No. 1 daytime running light relay.

Click here

NG

REPLACE NO. 2 DAYTIME RUNNING LIGHT RELAY (DRL LH)

OK

6.

CHECK HARNESS AND CONNECTOR (NO. 2 DAYTIME RUNNING LIGHT RELAY [DRL LH] - BATTERY)

(a) Remove the No. 2 daytime running light relay from the No. 2 engine room relay block.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

No. 2 daytime running light relay terminal 5 - Body ground

Power switch off

11 to 14 V

No. 2 daytime running light relay terminal 1 - Body ground

*a

Front view of wire harness connector

(to No. 2 Daytime Running Light Relay [DRL LH])

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (NO. 2 DAYTIME RUNNING LIGHT RELAY [DRL LH] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])

(a) Remove the No. 2 daytime running light relay from the No. 2 engine room relay block.

(b) Remove the instrument panel junction block assembly.

(c) Disconnect the 4B instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Relay terminal 2 - 4B-51

Always

Below 1 Ω

Relay terminal 2 or 4B-51 - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

8.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the driver side junction block assembly.

Click here

(b) Remove the main body ECU from the driver side junction block assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-25 (DRLE) - 4B-51

Always

Below 1 Ω

OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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