I doubt very much the alleged aftermarket alarm blew your BCM.Hey everyone! I joined the BCM Club in early June in Sacramento, Ca! I have a different story then what I have read here. I took the car in to the dealership to update the computer since it was acting up on me. Rep told me that "my after market alarm would damage the electrical system!" Excuse me? I never put one in and by the way I bought the car here! Then he proceeded with the conversation as I was not telling the truth! So here's what I learned and this bothered me! Dealerships place the after market alarms to avoid theft from the lots. THEN, they try to up sell them and make money off it! LOL So this after market system that I never put in the car blew up my BCM...thankfully I have the extended warranty and I will fight the $100 deductible HARD since I was not even close do my doing! In the mean time I have been disconnecting my battery.. 2 of 10 times I have issues with starting up the car. Put in a claim at Honda this morning and hoping that will add more of us to the pile. Crossing my fingers for 8 August like the rest of us fools! =(
The service rep you had the discussion with is probably just clueless that that particular dealer uses them as anti-theft devices. It is certainly nothing to get into an argument about (never argue with an ignorant person, especially an opinionated one, there is no percentage in it).
Also, service reps that write your paperwork are to be ignored on any technical discussion about your vehicle. There job is customer interaction and proper work order writeup, checking for open recalls and TSBs, and tracking your vehicle while it is for service and notifying you when your vehicle is ready. Any actual technical discussion should be conducted with an actual certified Honda service tech. Personally, I have never had an issue with having a service tech join a discussion between me and the service rep who writes the work order.
By the way, these systems are very common with dealerships around here. Most people just opt to have them disabled at time of sale. My dealer gives a 70% discount on the alarm at time of sale if the buyer wishes to keep it enabled, so I opt for them to stay enabled. Never had an issue with it, and it is a much better theft deterrent system than the vehicles OEM system.
Honestly, if you are going to use a dealership for your service... A) make sure it is one that is reputable and that you are comfortable with. B) ALWAYS report your service experience via the surveys Honda sends most owners when they have their vehicle serviced at a dealership. C) there is no reason to get into debates or conflict with a service rep, ever (learn to properly manage your interactions with service reps.. both good ones and bad ones... it is in your best interests to do so).