Ford Taurus Service Manual: Horn

SPECIFICATIONS

Torque Specifications

Ford Taurus. Instrumentation and Warning Systems

DESCRIPTION AND OPERATION

Horn

Component Location

Ford Taurus. Instrumentation and Warning Systems

Overview

The horn emits an audible tone when the driver air bag module is pressed. The horn output is controlled by a relay, which is integral to the BCM.

System Operation

System Diagram

Ford Taurus. Instrumentation and Warning Systems

Horn Operation

The horn switch consists of 2 sets of contacts separated by springs. The lower set is connected to ground and the upper set is connected to the horn signal circuit.

When the driver air bag module is pressed, it pushes down on the upper set of contacts, collapsing the springs and allowing the contacts to touch. When the contacts touch, it completes the circuit and provides the ground signal which is routed through the clockspring, the SCCM and then to the horn relay, which is integral to the BCM.

The BCM supplies the control and switched (load) voltage to the horn relay. When energized, the horn relay provides voltage to the horn, enabling the horn to sound.

DIAGNOSIS AND TESTING

Horn

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Ford Taurus. Instrumentation and Warning Systems

Pinpoint Tests

Pinpoint Test A: The Horn Is Inoperative

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Normal Operation and Fault Conditions

REFER to Horn.

Possible Sources

Fuse
Wiring, terminals or connectors
Steering wheel harness
Horn
Clockspring
Horn switch (part of the steering wheel)
BCM
SCCM

Visual Inspection and Diagnostic Pre-checks

Inspect the BCM fuse 22 (20A).

PINPOINT TEST A: THE HORN IS INOPERATIVE

Ford Taurus. Instrumentation and Warning Systems

Pinpoint Test B: The Horn Is Always On

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Normal Operation and Fault Conditions

REFER to Horn.

Possible Sources

Wiring, terminals or connectors
Steering wheel harness
Clockspring
Horn switch (part of the steering wheel)
BCM
SCCM

PINPOINT TEST B: THE HORN IS ALWAYS ON

Ford Taurus. Instrumentation and Warning Systems

REMOVAL AND INSTALLATION

Horn

Ford Taurus. Instrumentation and Warning Systems

Removal and Installation

With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100-02.

NOTE: The horn and bracket are installed as an assembly.
Remove the bolt and the horn.
- Disconnect the electrical connector.
- To install, tighten to 12 Nm (106 lb-in).

To install, reverse the removal procedure.

General Procedures, Removal and Installation

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Appendices
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