Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Daytime Running Light Relay Circuit

Toyota Tacoma 2015-2018 Service Manual / Lighting / Lighting System / Daytime Running Light Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the daytime running lights.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1
    • *1: w/ Smart Key System

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (DAYTIME RUNNING LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Main Body

Tester Display

Test Part

Control Range

Diagnostic Note

Daytime Running Light

Daytime running lights

ON/OFF

-

OK:

Daytime running lights illuminate.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT RUNNING LIGHT RELAY (DRL)

(a) Remove the running light relay.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Battery voltage not applied to terminals 1 and 2

10 kΩ or higher

3 - 5

Battery voltage applied to terminals 1 and 2

Below 1 Ω

NG

REPLACE RUNNING LIGHT RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (BATTERY - RUNNING LIGHT RELAY)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

Relay terminal 1 - Body ground

Always

11 to 14 V

Relay terminal 3 - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - DRIVER SIDE JUNCTION BLOCK AND BODY GROUND)

(a) Disconnect the 1F driver side junction block connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Running light relay terminal 2 - 1F-30

Always

Below 1 Ω

1F-30 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1F-30 - MB-25 (DRL)

Always

Below 1 Ω

1F-30 - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Component without harness connected

(Driver Side Junction Block)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE DRIVER SIDE JUNCTION BLOCK

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