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Test H: Horn Sounds Continuously

WARNING: This page is about a different car, the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, and 2001 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Horn switch is integral to driver's air bag module on steering wheel.
  1. Turn ignition switch to LOCK position. Disconnect Central Security Module (CSM) harness connector C256. CSM is located behind left side of instrument panel. If horn turns off, go to next step. If horn does not turn off, repair short to voltage in Yellow/Light Green wire between CSM and horn. See WIRING DIAGRAMS .
  2. Measure resistance between ground and CSM harness connector terminal No. 10 (Dark Blue wire). If resistance is 10 k/ohms or less, go to next step. If resistance is more than 10 k/ohms, go to step  5.
  3. Deactivate air bag system. See AIR BAG SAFETY PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. Connect CSM harness connector C256. Disconnect lower clockspring harness connector. If horn turns off, go to next step. If horn does not turn off, repair short to ground in Dark Blue wire between CSM and clockspring. See WIRING DIAGRAMS .
  4. Connect lower clockspring harness connector. Disconnect upper clockspring harness connector. If horn turns off, replace horn switch. See REMOVAL & INSTALLATION in appropriate AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS. If horn does not turn off, replace clockspring. See CLOCKSPRING  under REMOVAL & INSTALLATION.
  5. Disconnect all CSM harness connectors. Inspect harness connectors for corrosion and pushed out pins. Connect all CSM harness connectors, ensuring they are connected correctly. Operate system and verify if problem still exists. If problem still exists, replace CSM. See CENTRAL SECURITY MODULE  under REMOVAL & INSTALLATION. If problem does not exist, system is operating correctly at this time. Clear DTCs and perform CSM self-test.
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