509u and 506t stopped working on 5901
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=127566
Printed Date: May 12, 2025 at 4:56 PM
Topic: 509u and 506t stopped working on 5901
Posted By: sam21em1
Subject: 509u and 506t stopped working on 5901
Date Posted: June 06, 2011 at 6:32 PM
Ok so for the first week or so both my glass break and ultrasonic sensors were working fine. Until last night and I noticed neither werent working anymore.
This is the way that my installer wired them, I may have a feeling it's wrong.
The glass break sensor has a 4 wire plug that plugs in into the mux port (of the 5901 brain) but it also has a 3 wire male plug that has a red,blue,and black wires. The 509U wiring is two male 3 wire plug on each end, one plugs into the sensor. The 5901 brain doesnt have an input for a 3 wire accessory plug. So the one end of the 3-wire was cut and spliced from the 509U and the 3-wire coming off the glass break was also cut and spliced. These two 3-wires are soldered to each other by color matching.
Does that sound right??
From what i noticed,when both of these sensors worked i could just sit in the backseat and wave my arm and i can see the 509u sensor light go on/off and when i tap the glass with my key the 506t unit light would go on/off and now neither does anymore
The light on both units will come on only if i unplug and plug their wire plugs
I've tried doing a reset by the ignition, no result
I've tried reverting all system settings back to default, no result
Just took a multimeter and yes the brain is giving off 12v from the mux port, I also took a reading at the plugs where it connects to the 509U and 506T units and they were both getting 12v from the red an blue wires.
Replies:
Posted By: sam21em1
Date Posted: June 06, 2011 at 6:38 PM
 This is the plug that plugs into the 509U unit (both red and blue wire got the same result)
 This is the plug that goes into the 506t unit (both red and blue wire got the same result)
 Red wire from mux port
Posted By: howie ll
Date Posted: June 07, 2011 at 2:04 AM
The black ground wire may only go to ground when the alarm is enabled, check that, also the green and blue should go to GROUND when the sensors are activated.
Last; you wired correctly but the joined blue and green wires should have had 1N4004 diodes in line with the bands towards the sensors.
All those salient points are in the install guide.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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