Toyota Tundra Service Manual: Turn Signal Switch Circuit

Toyota Tundra Service Manual / Vehicle Interior / 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

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Using the Techstream, read the Data List.

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Combination Meter

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Turn Signal Switch (Right)

Turn signal switch (right) signal / OFF or ON

OFF: Turn signal switch (right) off

ON: Turn signal switch (right) on

Turn Signal Switch (Left)

Turn signal switch (left) signal / OFF or ON

OFF: Turn signal switch (left) off

ON: Turn signal switch (left) on

Turn Switch Signal (Full Turn)

Turn signal switch signal / OFF or ON

OFF: Turn signal switch off

OFF: Turn signal switch on (Full Turn)

Displays for both right and left turns.

OK:

Normal condition listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY

(a) Remove the headlight dimmer switch assembly.

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(b) Inspect the headlight dimmer switch assembly.

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REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY

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

(a) Disconnect the J10 headlight dimmer switch assembly connector.

(b) Disconnect the J28 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J10-14 (CR) - J28-28 (SW)	Always	Below 1 Ω
J10-13 (TR) - J28-17 (ER)	Always	Below 1 Ω
J10-15 (TL) - J28-16 (EL)	Always	Below 1 Ω
J10-12 (EL) - Body ground	Always	Below 1 Ω
J10-14 (CR) or J28-28 (SW) - Body ground	Always	10 kΩ or higher
J10-13 (TR) or J28-17 (ER) - Body ground	Always	10 kΩ or higher
J10-15 (TL) or J28-16 (EL) - Body ground	Always	10 kΩ or higher

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Terminals Of Ecu

Lost Communication With Image Processing Module "A" (U023A)

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