alarm, false signals from spliced sensors

OK, I have read up on here and my alarms website that installing more than 1 sensor while splicing them together may and will result in getting false signals from the alarm.

What is happening is...

My alarm was randomly going off for no reason. I thought my Shock Sensor was malfunctioning, so I had them install a radar sensor as well. Now the alarm goes off 3 times more often and all the time!

I then found out that the two sensors will send false signals to one another triggering the alarm. I ran a test an unplugged my Radar Sensor and so far my alarm has not gone off (2 hours so far).

I have not yet tested my shock sensor to see if it is working since the sensitivity was also turned down. Regardless I know I need to install Diodes in my alarm sensors wiring. Now my questions is:


Which wires do I install diodes on? Do these sensors receive false signals from the positive or negative wire. My Radar Sensor has 3 wires, what do I do then? I just want to make sure my alarm is working properly since I have had to take ti in 3 times since the install and they still dont have it right.

If I need to supply pictures or anything else I can. Thanx for all the help guys!


BTW: I did search and most of the threads were not relating to my Q's or were locked and I could not post.

OK, I have been searching more and obviously I need to isolate my sensors from one another. But I am also an alarm noob big time and I am confused.

Should I install both pos+ and neg- diodes? Is only one needed? Where do I place them and in which direction is the flow on my sensors? I have being a noob! :(

Ok. Some sensors have 3 wires and others have 4. The 4 wire sensors are dual stage, meaning that 1 wire is for a pre warn and the other is for full alarm. All sensors will have a red and black wire. Those are for your power and ground. On the 3 wire sensors, you will have a blue wire. Thats the full alarm. On 4 wire sensors, there will be that wire (blue) and another color usually white (which is your warn away). The only wire(s) that need to be dioder isolated are the tigger wires. For instane, If you are running 4 sensors to 1 sensor input on an alarm, each sensor's trigger wires would need to have its own diode. Understand?

Oh and you want each band facing the sensor. This is only true for negative wires. For positive wires, it would be the other way. ALL trigger wires are negative though.

I beleive mine is a 3 wire (wish it had a warning wire). So I only need to place a diode on the signal wire with the diode band facing the sensor, not facing the alarm ECU (brain)?

That is correct. You use 1 diode for each sensor's trigger wire if you have more than 1 sensor. Im going to have 2 shock sensors and a tilt sensor. Since I only have 1 sensor input, I will need 3 diodes. I think the reason why you are having false alarms is because you have the radar sensor adjusted too sensitive. I have heard that you really dont need to use diodes as long as the alarm brain has only 1 sensor input. In this case, the brain cant tell which sensor is actually triggering the alarm. In my case, no matter if its the shock sensor or the tilt sensor setting off the alarm, when I go to check what actually set off my alarm (door being opened, trunk being opened, or shock sensor going off) It will show that my shock sensor input was actually what triggered my alarm. So I would know that is was either one of my shock sensors OR my tilt sensor. But I would play it safe and use diodes, since they are a few cents and very easy to install.

Any one thought of simply correctly adjusting each sensor first?

howie does have a point...

Does your garage have metal reinforcement or cladding roof etc. or beams? That's your answer, do it outside, also remember with prox detectors there is a 3-5 sec gap between sensing and acting also about 20sec settle time, so take your time when adjusting. Diodes are totally unneccessary.

Also with radar sensors you can't leave beverages in the vehicle cup holders in a cup or bottle. The liquid inside picks up slight vibration from the ground or wind and causes the liquid inside the container to shift and cause false alarms as well. I am not sure if that is a problem but I figured to give you a heads up on that if you did not hear that before.

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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya