False Alarms; Diode wiring 2 sensors to one input

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=4937
Printed Date: May 28, 2024 at 3:42 PM

Topic: False Alarms; Diode wiring 2 sensors to one input

Posted By: thefranchise
Subject: False Alarms; Diode wiring 2 sensors to one input
Date Posted: October 29, 2002 at 4:26 PM

I have a aladdin 2k installed on my 2000 Eclipse

Sensors are the dual stage shock sensor and I added on a CS dual stage microwave sensor.

i applied diodes as one should on each stage line before they join.

what i am seeing is a sporatic stage 2 false alarm now and then; never stage 1. (oddly enough i notice them more when the car is parked on a hill for some odd reasons)

i also notice that almost exactly 10 mins everytime i arm the car i decides to go off with a false alarm.

could the diode size matter here? what else can be checked.

Replies:

Posted By: kickyride
Date Posted: October 29, 2002 at 5:15 PM

Diode size should around 1-2 amps though it's not really a big deal. Are the sensors near each other? If so, I've seen microwave sensors false when other electronics are too close. Make sure you have a diode for each sensor and each zone (should total to 4 with all of the cathodes facing the alarm). I'm not familiar with aladdin alarms but you may also check to make sure that the alarm's +12 volts and ground outputs for the sensors are beefy enough to handle 2 sensors. After all this, if you still have falsing problems, disconnect each sensor one at a time and see which sensor is causing the problem. That could help indicate if there may be other interference or spikes causing the condition. Other than that, post what kind of car you have and that may help with the 10 minute problem. Hope this helps.

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Mike
Sales/Tech Support - KICKYRIDEoCOM mobile electronics
MECP 1st class-Security Specialist

Posted By: thefranchise
Date Posted: October 29, 2002 at 10:21 PM

I have a 2000 Mitsubishi Eclipse

I have replaced the microwave sensor once already with no luck.

i have the microwave sensor pretty far from anything electrical that i can tell; its in the center arm rest. i've played with various settings but no luck

Posted By: thefranchise
Date Posted: October 30, 2002 at 11:25 PM

btt

Posted By: Velocity Motors
Date Posted: October 31, 2002 at 5:34 AM

Is the perimeter sensor a (-) or a (+) trigger device ?

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: thefranchise
Date Posted: October 31, 2002 at 7:46 PM

i believe its a negative trigger.

Posted By: Velocity Motors
Date Posted: November 01, 2002 at 5:33 AM

That's what I thought.... make sure you have the cathode facing the sensor, not the alarm. When you deal with a (-) trigger the anode side faces the alarm and the cathode faces the device.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: kickyride
Date Posted: November 01, 2002 at 10:00 PM

Ahhhhh......Jeff is correct. Guess I should have thought before I typed :] Thanks for the correction!

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Mike
Sales/Tech Support - KICKYRIDEoCOM mobile electronics
MECP 1st class-Security Specialist

Posted By: Velocity Motors
Date Posted: November 01, 2002 at 10:09 PM

Not a problem.... I too have fallen into this trap but experience has taught me a lesson posted_image

.

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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA