Ford Fiesta: Horn / Horn - System Operation and Component Description. Description and Operation

Ford Fiesta 2014 - 2019 Service Manual / Instrumentation and Warning Systems / Horn / Horn - System Operation and Component Description. Description and Operation

System Operation

System Diagram

Item	Description
1	Horn
2	Driver Airbag
3	Horn Switch
4	Clockspring
5	BCM

Horn Operation

The horn switch consists of a set of contacts separated by springs. One side is connected to ground and the other side is connected to the horn signal circuit. When the driver airbag is pressed, it pushes down on the switch, collapsing the springs and allowing the contacts to touch. When the contacts touch, it closes the circuit through the clockspring to the BCM , and provides a ground signal to the BCM . The BCM then provides voltage to the horn, enabling the horn to sound.

Horn - Component Location. Description and Operation

Horn. Diagnosis and Testing

DTC Chart(s) DTC Chart: Horn Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation)...

Other information:

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Special Tool(s) / General Equipment 205-343 (T95P-3514-A) Installer, Constant Velocity Joint Boot ClampTKIT-1995-FTKIT-1995-FM/FLMTKIT-1995-LM/M 205-D064 (D84L-1123-A) Puller, Bearing Flat Headed Screw Driver Hydraulic Press Materials Name Specification Motorcraft® Constant Velocity Joint GreaseXG-5 WSS-M1C258-A1 ..

Wheels and Tires. Diagnosis and Testing

Preliminary Inspection

Verify the customer concern by carrying out a road test on a smooth road. If any vibrations are apparent, Refer to the Symptom Chart: NVH.
To maximize tire performance, inspect for signs of incorrect inflation and uneven wear, which may indicate a need for balancing, rotation or front suspension alignment.
Correct tire pressure and driving techniques have an important influence on tire life. Heavy cornering, excessively rapid acceleration and unnecessary sharp braking increase tire wear.

Correct tire pressure and driving techniques have an important influence on tire life. Heavy cornering, exce