Toyota 4Runner: Horn System

Toyota 4Runner Service Manual / Vehicle Exterior / Horn / Horn System

Parts Location

PARTS LOCATION

ILLUSTRATION

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
	Low pitched horn assembly
	High pitched horn assembly
	Engine room relay block (No. 1 integration relay)
	Steering pad (Horn button assembly)
	Steering pad switch assembly*	-
	Spiral cable sub-assembly
	Harness or connector	-

*: w/ Steering Pad Switch Assembly

System Diagram

SYSTEM DIAGRAM

Horn

Components COMPONENTS ILLUSTRATION Inspection INSPECTION PROCEDURE 1. INSPECT HIGH PITCHED HORN ASSEMBLY (a) Apply battery voltage and check the operation of the horn according to the ...

Integration Relay

On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. REMOVE NO. 1 RELAY BLOCK COVER (a) Remove the No. 1 relay block cover. 2. INSPECT NO. 1 INTEGRATION RELAY (a) Using a screwd ...

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Playing MP3 and WMA discs
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LIN Communication Master Malfunction (B2287,B278C)
DESCRIPTION DTC B2287 is stored when there is an open or short circuit or an ECU communication malfunction between the power management control ECU and certification ECU. DTC B278C is stored when LIN communication between the certification ...