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

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.

(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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

REPLACE RUNNING LIGHT RELAY

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE DRIVER SIDE JUNCTION BLOCK

ACC Signal Circuit

DESCRIPTION This circuit detects whether the ignition switch is ACC or off, and sends this information to the main body ECU (multiplex network body ECU). WIRING DIAGRAM CAUTION / NOTICE / HINT ...

Headlight Dimmer Switch Circuit

DESCRIPTION The main body ECU (multiplex network body ECU) receives the following switch information: Light control switch position is off (DRL OFF), tail, head or AUTO (DRL). Dimmer ...

Other materials:

Rear Left Sensor Malfunction (C1AE6)
DESCRIPTION The No. 1 ultrasonic sensor (rear corner sensor LH) is installed on the rear bumper. The ECU detects obstacles based on signals received from the No. 1 ultrasonic sensor (rear corner sensor LH). If the No. 1 ultrasonic sensor (rear corner sensor LH) has an open circuit or other ma ...

Inspection
INSPECTION PROCEDURE 1. INSPECT REAR NO. 2 POWER WINDOW REGULATOR SWITCH ASSEMBLY *a Component without harness connected (Rear No. 2 Power Window Regulator Switch Assembly) *b Pull (Close) *c Push (Open) ...

Removal
REMOVAL CAUTION / NOTICE / HINT Text in Illustration *a Object Exceeding Weight Limit of Transmission Jack Be sure to perform this procedure with several people as the rear differential carrier assembly is very heavy. Be sure to follow the procedure ...