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??

 

Sounds right to me? Did you keep testing the unit with out resetting the ignition?

 

Yup.. the aux port has 4 wires (as in the old shock sensor port). Red, Black, Blue, Green. Red and Black are power and ground, and the Blue and Green are two separate channels (zones). Most of the shock sensors or other sensors had the Blue and Green wires tagged together to just one of the blue or green wires heading back to the brain (typically the blue IIRC), and the green wire from the brain was just left loose and you'd tape it off. The green was used as an input for another sensor (such as prox or glass break) where you'd tie both the blue and green from the glass break or prox sensor to the free green wire in the 4-pin harness that's plugged into the brain.

I hope that makes sense

 

How do you reset the ignition? If you mean just turn the key into on and then off and then take the key out with the door open then yes

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

 

The alarm is bypassing the shock sensor port. Try this. Turn the ignition on and off and arm the car. This will reset the alarm. Also make sure the ignition wire is also tag into the car.

If that does not work I would meter the shock sensor port and make sure its getting power.

 

Ive tried the reset procedure and still nothin. The alarm also has a 520t back up battery, would that matter?

 

No, the back up battery will not matter. You need to get a meter and see if the port is giving power on the red wire. If not you might and seems like you have a bad brain. If its the first gen with the anttena that has the seprate valet button and led plug. Take it back and hopefully the person who sold it to you can swap it out.

 

Its not the older gen,the valet button,led,and antenna are all one unit

Ill take a multimeter to the mux port though

 

the sensor port does not allow enough current to run both sensors. try wiring in a relay to feed power to the sensors. there is a DEI tech doc about this somewhere, i'll see if i can track it down.

 

If you can that'd be great!


UPDATE

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.

 

[IMG][/IMG]This is the plug that plugs into the 509U unit (both red and blue wire got the same result)

[IMG][/IMG]This is the plug that goes into the 506t unit (both red and blue wire got the same result)

[IMG][/IMG]Red wire from mux port

 

i kid you not, this is straight from the training seminar from DEI.

 

I used his same setup without issues. Atleast we know the port is getting power. Also check the ground to the sensors. It should show contunity to the ground on the h1 harness. Also try to power the sensors by themselves. Also if you use just one sensor does the port work?

 

Using one sensor still doesnt work

How do I check for continuity on the ground(s)?

 

Put your meter on continuity. Ground the meter to chassie ground. Touch the ground on the alarm brain ground input. THe metter should ring. Touch the shock sensor ground output. The metter should ring.