7
votes
Accepted
Car alarm install. Should I interrupt starter or ignition?
The average aftermarket car alarm uses cheap components and is not designed for high reliability and long life. This is not to criticize the particular model that you plan to install, but I'm speaking ...
- 8,518
6
votes
Why is a modem triggering car alarm?
The Volvo V70 factory alarm siren has a battery that would probably be bad by now. It's sealed in. When the voltage drops it will cause the alarm to go off for seemingly no reason. Check that first, ...
- 661
5
votes
Accepted
Honda Odyssey alarm goes off randomly
I have a workaround and its been in place about 6 weeks over 1 year now, so I feel confident to post it.
I left the vehicle with my prefered independent mechanic for two days. Regretfully the alarm ...
- 1,166
4
votes
Why is a modem triggering car alarm?
from wikipedia:
Certain car manufacturers use the 2.4 GHz frequency for their car
alarm internal movement sensors. These devices transmit on 2.45 GHz
(between channels 8 and 9) at a strength of ...
- 181
4
votes
Car alarm install. Should I interrupt starter or ignition?
Most modern immobilizer systems cut off
Ignition, Crank and fuel.
You could easily use it to cut off the start signal and something like the ASD relay control. That should disable both the fuel & ...
- 3,790
3
votes
Is there any reason that arming a car alarm honks or is it a holdover from the days when only luxury cars had alarms?
It has been my experience the reason why they honk is to tell you it's locked. Okay, that was anticlimactic, right? What I'm getting at is, if something on the vehicle is preventing the entire car ...
- 162k
3
votes
Car alarm install. Should I interrupt starter or ignition?
In the days of mechanical distributors and contact breakers, and before they became standard fitment, I was taught how to make an effective immobiliser.
The usual way was to put a hidden switch in ...
- 2,473
3
votes
Accepted
Alarming sound for indicator symbols on the instrument cluster on Hyundai i30
There can be multiple explanations for this:
1. Disabled the speaker through OBD port (some manufactures give you an option to disable this in the software using a laptop connected to your OBD port). ...
- 130
3
votes
Can the OBD port be used to disable the car alarm?
Maybe someones google skills are better than mine. I wasn't able to find custom firmware to flash the Smart Junction Box and disable the perimeter alarm. You would still need a J2534 device to ...
- 10.7k
3
votes
Accepted
Volvo S40: Identify cause of alarm triggering
I was mistaken when I said the module was in great shape. Although the battery had a good charge and the circuit board was intact, I later noticed that the connection between the two had a significant ...
- 3,012
3
votes
How to setup an emergency brake warning system?
Well, the thing is, you already have this two different ways in the car.
If the transmission is not in Park or Neutral, the ignition should not release the key.
If you open the door and the key is ...
- 12.2k
3
votes
Factory panic alarm going off after changing battery [97 Toyota Camry]
Same thing just happened to my 93 landcruiser...changed battery and alarm kept going off, it shuts off after a few cycles but the immobilizer would not allow the car to start. Tried everything, and ...
- 31
3
votes
2016 Toyota Camry Automatic Alarm Lock
According to the owner's manual I found online, once all doors and trunk are closed, then locked, the alarm automatically activates after 30 seconds.
There may not be an external indication of this, ...
- 12.2k
3
votes
Honda Odyssey alarm goes off randomly
We were dealing with a similar problem with a 2003 Odyssey. We watched the YouTube video and disconnected the hood switch connector, and the problem was improved for several months. Out of nowhere ...
- 31
2
votes
Honda Odyssey alarm goes off randomly
In my car, the reason for the alarm going off randomly was water leaking from the "body seam" on the roof, through the left front pillar, and zapping the computer.
- 21
2
votes
Wiring a switch in horn line for on/off operation
Some horns have one wire (supply) and the earth is completed by the fixing, others have two connections (supply and earth).
All you need is to put a single pole switch capable of 6 amps or so between ...
- 34.7k
2
votes
Adding a "door open" alarm when handbrake is on?
You'll need to add two relays in series - in an 'and' setup.
This means that both relays need to close their switches to allow the buzzer to work.
The handbrake switch should drive a double acting ...
- 21
2
votes
2011 Honda Civic: new battery, alarm will not stop
Your car is equipped with both an immobilizer and a theft deterrent alarm (the beep beep one). Just the theft alarm beeping WILL NOT prevent starting, only the immobilizer does that. (Assuming this is ...
- 3,790
2
votes
I took the battery off my car 2006 Honda CR-V
I assume an aftermarket car alarm system.
Factory-installed security systems generally behave better (with some exceptions and I am not aware if your Honda is among the bad exceptions).
It is pretty ...
- 2,385
2
votes
Honda Accord 97 won't start without fob button but I lost my fob
So I found a manual inside the car that has some information on how to disable it. Apparently the security system is from a company or brand called VPS.
The solution was to quickly turn the key in ...
- 131
1
vote
Issue with Tailgate Alarm on 2014 Ford Escape
On that MY Escape the BCM looks for a ground on terminal 47 of the C2280B connector. Normally with the liftgate closed it will be. With the liftgate open the circuit goes open (It may have ignition ...
- 10.7k
1
vote
Installing an external ignition kill switch on a 2015 VW Golf?
Why not a magnetic switch on the upper bonnet shroud below the windscreen?
Use a black thing that you just put a magnet on as you get up to the car and the magnet is easily removed as well...
For ...
- 34.7k
1
vote
Accepted
Electric welding on modern car, what to disconnect?
I usually disconnect both sides of the battery and also disconnect the alternator as well.
I also make sure that the welding earth is as close as possible to the weld area to minimize the return path....
- 34.7k
1
vote
Volvo S40: Identify cause of alarm triggering
Does the alarm trigger only when the vehicle is locked or also when driving? It doesn't seem clear from your question.
You need a good diagnostic scanner, a generic OBDII will not be good enough. You ...
- 2,785
1
vote
Accepted
How to setup an emergency brake warning system?
You're looking for two switches/circuits.
The "door is open" circuit, which closes/energizes when a front door is open. The main purpose of this circuit is to light the dome light.
The "Park/...
1
vote
How to setup an emergency brake warning system?
Why not use a small 12v buzzer, relay and a push type switch (push to close) fitted to the handbrake so that if the door is open the buzzer sounds : just have the relay "earth" through the door switch ...
- 34.7k
1
vote
Accepted
My '06 Nissan 350z (UK) alarm goes off when battery connected
This is what i did to resolve this:
1) Open the door, pop the bonnet, Disconnect the battery. Technically an optional step, but it's good for your hearing...
2) Use the cable emergency release under ...
- 31
1
vote
Add sensors to stock car alarm
If you said what make, model and year the car was it might help, if that model was available with motion, ultrasonic or tilt sensors it will be possible to retrofit them.
Retrofitting a factory ...
- 2,785
1
vote
Add sensors to stock car alarm
You can get extremely cheap and low-power motion sensors (PIR type). They consume current in the microamp-milliamp range (5V) when active, so it won't run down your battery.
When triggered by motion,...
- 111
Only top scored, non community-wiki answers of a minimum length are eligible