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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Horn System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Horn >> Pinpoint Tests >> Pinpoint Test B: The Horn Sounds Continuously

Pinpoint Test B: The Horn Sounds Continuously

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE VEHICLE SECURITY MODULE FOR AN INTERNAL SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Vehicle Security Module C2113a.
    • Does the horn sound? 
    • Yes  : GO to B2.
    • No  : GO to  B6.
  2. B2 CHECK HORN CIRCUIT 
    • Key in OFF position.
    • Disconnect: CJB C270h.
    • Does the horn sound continuously? 
    • Yes  : REPAIR circuit 6 (YE/LG). TEST the system for normal operation.
    • No  : GO to B3.
  3. B3 CHECK THE CJB 
    • Connect: CJB C270h.
    • Disconnect: CJB C270a.
    • Does the horn sound continuously? 
    • Yes  : INSTALL a new CJB. TEST the system for normal operation.
    • No  : GO to B4.
  4. B4 CHECK HORN SWITCH CIRCUITRY 
    • Connect: CJB C270a.
    • Disconnect: Clockspring C218a.
    • Does the horn sound continuously? 
    • Yes  : REPAIR circuit 1 (DB). TEST the system for normal operation.
    • No  : GO to B5.
  5. B5 CHECK THE CLOCKSPRING 
    • Remove the driver air bag. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Connect: Clockspring C218a.
    • Connect the restraint system diagnostic tools to the clockspring.
      WARNING: Make sure there is no one inside the vehicle and there is nothing blocking or set in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury.

      Connect the battery.

    • Does the horn sound continuously? 
  6. B6 CHECK FOR CORRECT VEHICLE SECURITY MODULE OPERATION 
    • Disconnect all the vehicle security module connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect any disconnected connectors making sure they are seated correctly.
    • Make sure all other system connectors are fully seated.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    • Yes  : INSTALL a new vehicle security module. REFER to MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test.
    • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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