Toyota Tacoma (2015-2018) Service Manual: Turn Signal Switch Circuit

Toyota Tacoma (2015-2018) Service Manual / Lighting / Lighting System / Turn Signal Switch Circuit

DESCRIPTION

The combination meter assembly receives the turn signal switch information and controls the turn signal lights.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (TURN SIGNAL SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) According to the display on the Techstream, read the Data List.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Turn Signal Switch (Right)	Turn signal switch (right) signal / ON or OFF	ON: Turn signal switch (right) on OFF: Turn signal switch (right) off	-
Turn Signal Switch (Left)	Turn signal switch (left) signal / ON or OFF	ON: Turn signal switch (left) on OFF: Turn signal switch (left) off	-
Turn Switch Signal (Full Turn)	Turn signal switch (full turn) signal / ON or OFF	ON: Turn signal switch (left or right) on OFF: Turn signal switch (left and right) off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Turn Signal Switch (Right)

Turn signal switch (right) signal / ON or OFF

ON: Turn signal switch (right) on

OFF: Turn signal switch (right) off

Turn Signal Switch (Left)

Turn signal switch (left) signal / ON or OFF

ON: Turn signal switch (left) on

OFF: Turn signal switch (left) off

Turn Switch Signal (Full Turn)

Turn signal switch (full turn) signal / ON or OFF

ON: Turn signal switch (left or right) on

OFF: Turn signal switch (left and right) off

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

(a) Remove the C11 headlight dimmer switch assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
12 (TR) - 15 (EL)	Turn signal switch in neutral position	10 kΩ or higher
11 (TL) - 15 (EL)	Turn signal switch in neutral position	10 kΩ or higher
13 (CR) - 15 (EL)	Turn signal switch in neutral position	10 kΩ or higher
12 (TR) - 15 (EL)	Turn signal switch in right turn position	Below 1 Ω
13 (CR) - 15 (EL)	Turn signal switch in full right turn position	Below 1 Ω
11 (TL) - 15 (EL)	Turn signal switch in left turn position	Below 1 Ω
13 (CR) - 15 (EL)	Turn signal switch in full left turn position	Below 1 Ω

Text in Illustration

*1	Component without harness connected (Headlight Dimmer Switch Assembly)

REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - COMBINATION METERASSEMBLY AND BODY GROUND)

(a) Disconnect the C9 combination meter assembly connector.

(b) Disconnect the C11 headlight dimmer switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C11-12 (TR) - C9-8 (ER)	Always	Below 1 Ω
C11-11 (TL) - C9-7 (EL)	Always	Below 1 Ω
C11-13 (CR) - C9-9 (SW)	Always	Below 1 Ω
C11-12 (TR) - Body ground	Always	10 kΩ or higher
C11-11 (TL) - Body ground	Always	10 kΩ or higher
C11-13 (CR) - Body ground	Always	10 kΩ or higher
C11-15 (EL) - Body ground	Always	Below 1 Ω

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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