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Home >> Mercury >> 2003 >> Mountaineer 4.0 K, RWD >> Repair and Diagnosis >> Electrical >> Gauges >> Information Center - Information, Gauges And Warning Devices >> Diagnosis And Testing >> Horn >> Symptom Chart

Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
The horn is inoperative
  • Battery junction box (BJB) fuse 28 (20A).
  • Central junction box (CJB) fuse(s):
    • 6 (10A).
    • 18 (10A).
  • Circuitry.
  • Clockspring.
  • Horn switches.
  • Horns.
  • Horn relay.
  • Powertrain control module (PCM).
 Go To PINPOINT TEST AH .
The horn is always on
  • Circuitry.
  • Clockspring.
  • Horn switches.
  • Horn relay.
  • Vehicle security module.
  • Tire pressure monitor module.
 Go To PINPOINT TEST AI .
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