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Car: 2005 Chrysler 300C
Join Date: Feb 2005
Location: Coatesville, PA, U.S.A.
Thanked 195 Times in 179 Posts
Because the horn sounds when you press the lock or panic buttons the trouble is not the horn relay, power to the relay, or power from the relay to the horns. Something is having a problem between the horn button in the steering wheel (certainly not the most sensitive to start with!) and the front control (FCM) module.
Are any of these diagnostic trouble codes in the EVIC: B2336, B2337, or B2338?
If you would like I can scan the HORN section of the service amnual and e-mail it to you. It's like (12) pages and has step-by-step instructions, including schematics and diagrams.
2005 300C BRILLIANT BLACK, DRL, Mesh Grill/Vents, Chrome Pillars & Fender Trim, MDS Indicator, Quad Brake Lights, Tinted Windows, De-Molded, K&N Aircharger, 180 T-Stat, Flashing Sidemarkers, Predator Cust. Perf. 93 CAI Tune
1997 MUSTANG COBRA 'VERT, TRIPLE BLACK, Vortech S/C'd., ECT Mod., 4.10 Rear, 18" Saleen Wheels
1950 FORD TUDOR FLATHEAD V8 - Sold 6/27/14 after 16 years of fun.