Toyota Tundra Service Manual: Horn System

Toyota Tundra Service Manual / Vehicle Interior / 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 the problem symptom. 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
	Integration relay (HORN relay)
	Spiral cable sub-assembly
	Horn button wire sub-assembly*1	-
	Cruise switch wire*2	-
	Steering pad switch assembly*3
	Horn button assembly
	Harness or connector	-

*1: w/o Steering Pad Switch Assembly, w/o Cruise Control System
*2: w/o Steering Pad Switch Assembly, w/ Cruise Control System
*3: w/ Steering Pad Switch Assembly

System Diagram

SYSTEM DIAGRAM

High Pitched Horn

Integration Relay

See More:

Toyota Tundra Service Manual > Can Communication System: Open in Bus 1 Main Bus Line
DESCRIPTION There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher. Symptom Trouble Area Resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ...

Toyota Tundra Service Manual: Horn System

High Pitched Horn

Integration Relay

See More:

Toyota Tundra Owners Manual

Toyota Tundra Service Manual