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).
Body Control Module (BCM) DTC Chart
DTC | Description | Actions |
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B1323:23 | Horn Switch: Signal Stuck Low | GO to Pinpoint Test B |
Symptom Chart(s)
Symptom 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).
Symptom Chart
Condition | Possible Sources | Actions |
---|---|---|
The horn is inoperative | Refer to the pinpoint test | GO to Pinpoint Test A |
The horn is always on | Refer to the pinpoint test | GO to Pinpoint Test B |
Pinpoint Tests
Diagnostic Overview
The Horn Is Inoperative
Refer to Wiring Diagrams Cell 44 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Horn - System Operation and Component Description (413-06 Horn, Description and Operation).
Possible Causes
Visual Inspection and Diagnostic Pre-checks
A1 CHECK THE BCM (BODY CONTROL MODULE) HORN OUTPUT USING THE HORN OUTPUT (HORN) PID (PARAMETER IDENTIFICATION) | ||||||||||
Does the horn sound when commanded on?
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A2 CHECK FOR VOLTAGE AT THE HORN USING THE HORN OUTPUT (HORN) PID (PARAMETER IDENTIFICATION) | ||||||||||
Is the voltage greater than 11 volts?
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A3 CHECK THE HORN GROUND CIRCUIT FOR AN OPEN | ||||||||||
Is the resistance less than 3 ohms?
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A4 CHECK THE BATTERY VOLTAGE SUPPLY TO THE BCM (BODY CONTROL MODULE) | ||||||||||
Is the voltage greater than 11 volts?
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A5 CHECK THE HORN VOLTAGE SUPPLY CIRCUIT FOR AN OPEN | ||||||||||
Is the resistance less than 3 ohms?
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A6 CHECK THE HORN VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND | ||||||||||
Is the resistance greater than 10000 ohms?
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A7 CHECK FOR HORN SWITCH INPUT | ||||||||||
Is the resistance less than 3 ohms?
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A8 CHECK HORN OPERATION WITH HORN SWITCH CIRCUITS ISOLATED | ||||||||||
NOTE: Test is carried out with jumper at female (harness) side of connector.
Does the horn sound?
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A9 CHECK THE HORN SWITCH CIRCUIT FOR AN OPEN | ||||||||||
Is the resistance less than 3 ohms?
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A10 CHECK THE HORN SWITCH GROUND CIRCUIT FOR AN OPEN | ||||||||||
Is the resistance less than 3 ohms?
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A11 CHECK THE HORN SWITCH GROUND CIRCUIT | ||||||||||
Is the resistance less than 3 ohms?
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A12 CHECK THE HORN SWITCH CIRCUIT AT THE STEERING WHEEL HARNESS | ||||||||||
Is the resistance less than 3 ohms?
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A13 CHECK THE HORN SWITCH GROUND CIRCUIT AT THE STEERING WHEEL HARNESS | ||||||||||
Is the resistance less than 3 ohms?
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A14 CONFIRM THE BCM (BODY CONTROL MODULE) FAULT | ||||||||||
Is the concern still present?
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Diagnostic Overview
The Horn Is Always On
Refer to Wiring Diagrams Cell 44 for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Horn - System Operation and Component Description (413-06 Horn, Description and Operation).
DTC Chart
DTC | Description | Fault Trigger Condition |
---|---|---|
B1323:23 | Horn Switch: Signal Stuck Low | A fault is indicated when the BCM detects the horn switch pressed or a short to ground exists on the horn switch signal circuit for greater than 120 seconds. This DTC also sets if the horn switch is pressed during the BCM self test. |
Possible Causes
B1 ISOLATE THE HORN SWITCH AND CIRCUITS | ||||
Does the horn continue to sound?
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B2 ISOLATE THE BCM (BODY CONTROL MODULE) | ||||
Does the horn continue to sound?
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B3 ISOLATE THE HORN SWITCH | ||||
Does the horn continue to sound?
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B4 CHECK THE HORN SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND | ||||
Does the horn continue to sound?
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B5 CHECK THE CLOCKSPRING FOR A SHORT TO GROUND | ||||
Does the horn continue to sound?
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B6 CONFIRM THE BCM (BODY CONTROL MODULE) FAULT | ||||
Is the concern still present?
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Special Tool(s) / General Equipment
Surface GaugeCheck
Ride Height Measurement - Front
NOTE: Make sure that the vehicle is positioned on a flat, level surface and the tires are inflated to the correct pressure. Vehicle should have a full tank of fuel.
Ride height = 2-3