Toyota Tacoma manuals

Toyota Tacoma (2015-2018) Service Manual: Horn System

Parts Location

PARTS LOCATION

ILLUSTRATION

Precaution

Precaution

PRECAUTION

1. IGNITION SWITCH EXPRESSIONS

(a) The type of ignition switch used on this model differs depending on the specifications of the vehicle. The expressions listed in the table below are used in this section.

Expression

Ignition Switch (Position)

Engine Switch (Condition)

Ignition Switch off

LOCK

Off (Lock)

Ignition Switch ACC

ACC

On (ACC)

Ignition Switch ON

ON

On (IG)

Engine Start

START

Start

System Diagram

SYSTEM DIAGRAM

Data List / Active Test

Data List / Active Test

DATA LIST / ACTIVE TEST

1. PERFORM ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(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

Vehicle Horn

Vehicle horns

ON/OFF

-

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

HORN SYSTEM

Symptom

Suspected Area

See page

Horn does not sound

HORN fuse

-

HORN relay

Horn button assembly

-

Steering pad switch assembly

Spiral cable with sensor sub-assembly

Driver side junction block

-

Harness or connector

-

Horn blows all the time

HORN relay

Horn button assembly

-

Steering pad switch assembly

Spiral cable with sensor sub-assembly

Driver side junction block

-

Main body ECU (Multiplex network body ECU)

-

Harness or connector

-

Horn Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HORN RELAY ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below ...

Low Pitched Horn
Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT LOW PITCHED HORN ASSEMBLY (a) Check the operation. (1) Apply battery voltage to the terminal 1 an ...

Other materials:

Front Occupant Classification Sensor LH Collision Detection (B1785)
DESCRIPTION DTC B1785 is set when the occupant detection ECU receives a collision detection signal, which is sent by the occupant classification sensor front LH when an accident occurs. DTC B1785 is also set when the front seat with adjuster frame assembly RH is subjected to a strong impact, ...

Horn Relay
On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HORN RELAY ASSEMBLY (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Connection ...

Reservoir Level Switch Disconnected (C1453,C1454)
DESCRIPTION The brake fluid level warning switch sends the appropriate signal to the skid control ECU (master cylinder solenoid) when the brake fluid level drops. DTC Code DTC Detection Condition Trouble Area C1453 With the ECU termina ...

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