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Home >> Chrysler >> 2005 >> 300 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Body Control Modules) >> System Tests >> Vehicle Theft Security System (VTSS) >> Horn Relay Open
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Horn Relay Open

WARNING: This page is about a different car, the 2002 Dodge Grand Caravan, 2002 Dodge Caravan, 2002 Chrysler Voyager, and 2002 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: After making any repairs, perform VTSS VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition on. Using scan tool, erase Front Control Module (FCM) DTCs. Turn ignition off. Wait approximately 10 seconds. Turn ignition on. Recheck for FCM DTCs. If HORN RELAY OPEN resets, go to next step. If HORN RELAY OPEN does not reset, system is okay at this time. Check for intermittent poor connections or faulty circuits. See ANTI-THEFT and HORN in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  2. Turn ignition off. Locate and disconnect FCM. See FRONT CONTROL MODULE  under REMOVAL & INSTALLATION. Using DVOM, measure voltage between ground and FCM connector terminal No. 10. See Figure. If voltage is 10 volts or less, go to next step. If voltage is greater than 10 volts, replace FCM.
  3. Remove horn relay from Intelligent Power Module (IPM). See Figure. Using DVOM, measure resistance between FCM connector terminal No. 10 and horn relay cavity terminal No. 85. If resistance is 5 ohms or less, replace horn relay. If resistance is greater than 5 ohms, replace IPM.
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