Ford Fiesta: 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.
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:
DTC Charts
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).
BCM
DTC Chart
DTC
Description
Action
B1182:00
Tire Pressure Monitor..
Special Tool(s) /
General Equipment
Resistance Spotwelding Equipment
Scraper for Straight Edges
Air Body Saw
MIG/MAG Welding Equipment
Spot Weld Drill Bit
Materials
Name
Specification
Seam SealerTA-2-B, 3M™ 08308, LORD Fusor® 803DTM
-
Flexible Foam Repair3M™ 08463, LORD Fusor® 121
-
Remova..
Categories
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
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