The 99 Accord ex security system ( which is stock ) is botched up. It is going off while exposed to heavy vibrations at a truck depo. Rather than tracing down the fault my impulse is to disable the system. So, the question is does the honda security system have a dedicated fuse?

Has any one had this fault?

Also are the wire schematics in either Chilton or Haynes manuals useful?

 

I'm not sure if you can disable just the factory alarm with a dedicated fuse. From the installation instructions, there is a sensitivity **** you can turn down on the control unit. Based on the installation instructions, the control unit is installed under the driver dash lower cover.

From what you describe, that doesn't sound like a malfunction, but due to the sensitivity setting.

Here is a link to the Honda installation instructions:

http://www.hondaautomotivepart....html

I don't believe the Chilton or Haynes manual would be helpful in this case.

 

Unfortunately, the installation instructions are actually different from the system that comes in with the EX models. There's no fuse... no sensitivity adjustment (no shock trigger)...

As many times as people have asked about this, no one has been able to find an answer that we are aware of. Chilton's and Haynes' wiring diagrams are not helpful in this situation.

 

According ( ha ha ) to the owners manual to set the stock alarm off it is necessary to open the door without using the key or the remote key-less entry. No mention is made of shock sensitivity. In other words it should be possible to throw a brick through your cars window and the alarm wouldn't do a thing. But as soon as you reach through the window and open the door then the alarm aught to go off.

An easy test would be to leave your windows down, lock the door, wait a minute, and then reach through the open window and pull the lock button up and enter the vehicle normally. If I understand correctly that would trigger the Alarm. Point being to prevent someone using a slim-jim to enter a car with this system.

Thinking about the system this way yields the following thoughts:

1 Honda probably wire the ignition circuit through the security module, and use a number of ohm values to prevent theft.

2 IF the problem is only occurring in one place there may be a factor causing the fault in that one place. The fault occur-es at a truck depot. Truck depots have a lot of cb radio traffic, gps, cell phone use, etc. It would seem that an interesting question is if the system can be tricked into panic mode by stray radio emissions.

3 If it is a design fault Honda know about it and have a fix. (New programming or hard-wear)

4 If it is a fault not due to design it will become more frequent as time passes. IF it is due to corrosion or fatigue of a wire / connector in the system.

Whad'ya tink?

 

Stock EX alarm doesn't have a shock sensor, thus no mention of shock sensitivity in the owner's manual.

The stock alarm is, unfortunately, no more than a keyless entry system that's connected to the horn. Nothing more.

Although you are not the first to have a problem with the car alarm randomly going off, you are one of the few. I would say that it's not a design flaw, and is most likely a problem with wires.