The dealer can hook up his diagnostic tool and retrieve the fault code.
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SECTION 413-06: Horn
2003 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION
Horn
Horn components include the following items:
- clockspring
- horn relay
- horns
- steering wheel pad horn switch
Horn switches
The horn switch is incorporated into the driver side air bag module in the steering wheel. The switch is powered through the clockspring and grounded through the steering column. For removal and installation of the horn switch, refer to Section 501-20B .
Horn relay
The horn relay is incorperated into the central junction box (CJB). The central junction box is located behind the passenger lower kick panel.
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Symptom Chart
Symptom Chart
Condition
Possible Sources
Action
- Central junction box (CJB).
- CJB fuse 26 (20A).
- Circuitry.
- Horn switch.
- Horn.
- Clockspring.
- Powertrain control module (PCM).
- The horn sounds continuously
- Central junction box (CJB).
- Circuitry.
- Horn switch.
- Horn.
- Vehicle security module.
- Tire pressure monitor (TPM) module.
- Clockspring
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