One problem related to horn assembly has been reported for the 2004 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mercury Grand Marquis based on all problems reported for the 2004 Grand Marquis.
The contact owns a 2004 Mercury Grand Marquis. While driving 50 mph, the contact smelled a burning odor and noticed smoke coming from the lighting control module. He pulled the vehicle over and opened the hood. The horn began to sound, so he disconnected the battery. The fire department arrived and a report was filed. The contact was informed that the failure was due to an electrical issue. The vehicle was towed to a repair shop and the lighting control module box was repaired. The dealer stated that they were unaware of the failure. The failure and current mileages were 79,000.