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Home >> Ford >> 2005 >> Expedition 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 467 (Horn System) >> Diagnosis And Testing >> Horn >> Symptom Table >> Notes

Symptom Table: Notes

WARNING: This page is about a different car, the 2006 Lincoln Navigator and 2006 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM TABLE

Condition Possible Sources Action
  • The horn is inoperative
  • Fuse
  • Circuitry
  • Horn
  • Clockspring
  • Horn switch (part of the driver air bag module)
  • Central junction box (CJB)
  • Powertrain control module (PCM)
  • The horn is always on
  • Circuitry
  • Central junction box (CJB)
  • Clockspring
  • Horn switch (part of the driver air bag module)
  • Vehicle security module
  • High horn effort
  • Steering wheel components
  • Horn switch (part of the driver air bag module)