Possible Causes
WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
HORN RELAY
BODY CONTROL MODULE INTERNAL MALFUNCTION
OPEN HORN SWITCH
HORN/RADIO CONTROL MUX CIRCUIT OPEN
CLOCKSPRING
HORN/RADIO CONTROL MUX CIRCUIT OPEN
BODY CONTROL MODULE INTERNAL MALFUNCTION
OPEN FUSE #8
JUNCTION BLOCK - OPEN FUSED B(+) CIRCUIT
JUNCTION BLOCK - OPEN HORN RELAY CONTROL CIRCUIT
BODY CONTROL MODULE INTERNAL MALFUNCTION
HORN RELAY
JUNCTION BLOCK - OPEN HORN RELAY OUTPUT CIRCUIT
OPEN HORN RELAY OUTPUT CIRCUIT
OPEN GROUND CIRCUIT
OPEN HORN