1999 Lincoln Town Car horn

1999 LINCOLN TOWN CAR
104,000 MILES • 0.5L • V8 • 2WD • AUTOMATIC
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CHILLIES2
  • MEMBER
  • 1 POST
After having our car engine cleaned the horn started blowing continuously. After that our horn will not work at all.Had fuses checked, any suggestions would truly be appreciated
Jun 23, 2015 at 11:33 AM
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JDL
  • ✓Experienced Mechanic
  • 16,098 POSTS
I can suggest things to check, but, you have to do the testing? Did you check for voltage at the fuse with key on?
If you use a jumper wire between terminals 30 and 87 at the relay, the horn should sound, does it? If it does, the problem is on the control side of relay, 86 is voltage, 85 is ground. For testing, you could use a redundant ground coming off terminal 85 wiring, if you can get at it? If the horn sounds, the problem is either the wiring circuit or one of those modules in the wiring diagram.
Can you check for applicable trouble codes, to see if it might point to one of those modules as a problem?
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Jun 24, 2015 at 12:32 AM
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