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Home >> Ford >> 2003 >> Thunderbird >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Information, Gauges & Warning Devices >> Diagnosis And Testing >> Horn >> Symptom Chart

Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
No communication with the front electronic module (FEM)
  • Central junction box (CJB) fuses:
    • 20 (10A).
    • 30 (5A).
    • 33 (10A).
  • Battery junction box (BJB) fuse 20 (30A).
  • Circuitry.
  • J1850 standard corporate protocol (SCP) communication network.
  • FEM.
 REFER to MODULE COMMUNICATIONS NETWORK to continue module communication diagnosis.
No communication with the instrument cluster module
  • Central junction box (CJB) fuses:
    • 4 (5A).
    • 13 (5A).
    • 17 (5A).
    • 20 (10A).
  • Circuitry.
  • J1850 standard corporate protocol (SCP) communication network.
  • Instrument cluster.
 Go To PINPOINT TEST F .
The horn is inoperative
  • Auxiliary junction box fuse 4 (15A).
  • Circuitry.
  • Horn relay.
  • Horn switch.
  • Horn.
  • Clockspring.
  • Front Electronic Module (FEM).
  • Instrument cluster.
 Go To PINPOINT TEST AE .
The horn is always on
  • Instrument cluster.
  • Horn relay.
  • Circuitry.
  • Clockspring.
  • Horn switch.
  • Front Electronic Module (FEM).
 Go To PINPOINT TEST AF .
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