LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2005 >> 300 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 421 (Body Diagnostic Procedures - Introduction) >> System Description And Functional Operation >> Front Control Module >> Relay Controls >> Horn Relay

Horn Relay

WARNING: This page is about a different car, the 2004 Dodge Grand Caravan, 2004 Dodge Caravan, and 2004 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.

The horn relay operates through a direct wire input to the FCM from the horn switch (FCM pin 17), or a PCI Bus message from the BCM. The relay responds to the horn switch, remote door lock and VTA alarm functions. The horn relay is powered through low side control on pin 10 of the FCM. Under normal operating conditions, if the horn is pressed for longer than 30 seconds, the FCM will automatically deactivate the horn to prevent damage to it. The FCM will reactivate control of the relay after a 25 second cool-down period. This circuit is electronically controlled and continuously monitored for malfunctions.

scientia non olet · About LEMON Manuals