Hi all,

Been doing some research as I want to add a glass break sensor to the car. Did not want to fork out $600+ to have an aftermarket system with glass break sensor fitted to both cars. I came upon a US Ford Explorer forum where a guy posted the following. Does anyone know if it is doable on our cars and/or knows the ignition and door pin circuit of the alarm:



I chose the glass break sensor to keep my horn alerts down to real theft attempts, and not thunder or exhausts. The sensor I used a a DEI(directed)506t, but any of them on ebay should work, as long as thier output is at least 100mA.
The sensor is a negative trigger input, so a Bosch relay was used, purchased from autozone.
The sensor is wired into the door pin circuit of the alarm at the harness in the drivers kick panel, its dark blue with a light green stripe.
The wiring goes like this - connect the (-) output of the glass break sensor to Pin 86 of a Bosch style relay. Connect Pin 85 and Pin 30 to constant power. Connect Pin 87 to the wire listed above.
Connect the 12vdc wire of the sensor directly to constant power, connect the ground of the sensor to an ignition wire, i forget what color it was. When the ignition is off it will rest at ground and provide ground to the sensor, enabling it. When started or on, sensor will not reach ground, disabling it.


Cheers,
Vlad

Anything possible, sounds legit :) But it would take a little know how and a circuit diagram, to make it all work.

There should only be 3 wires on the glass break sensor. Red goes to constant power, black to earth and the negative trigger wire to the door circuit wire. That is all that is required. Just remember to mount the sensor near the centre of the interior so the sensitivity is equal throughout the car.

There should only be 3 wires on the glass break sensor. Red goes to constant power, black to earth and the negative trigger wire to the door circuit wire. That is all that is required. Just remember to mount the sensor near the centre of the interior so the sensitivity is equal throughout the car.
Hey tee jay 2, thanks for that. Do you know which wire is ther door trigger wire?

Cheers,

Being doing some searching. Found the following:

One source says that the door trigger wire is the Red/White on medium sized plug in the BEM under the dash to the right of the steering column.

Another source says it is the Yellow (pin 8) of 19 pin plug below the ETACS unit which is behind the fuse box.

Can anyone confirm which one to use?

Cheers,
Vlad

It is the red with the white trace at the BEM.

Cheers for that. Will attempt to do that when I have some spare time. We had 3 cars broken into at work last month. They smashed the windows and climbed in without setting off the alarm. Today, when one of our staff walked out to the car park, a dodgy looking kid did a quick about-turn, hopped into a waiting car and zoomed off. Got their number plate and have reported to the police.

Lets hope the cops follow it up. When you install the glass break sensor, the best way to test them is to rattle your keys on the winscreen. It simulates glass breaking. Good Luck.

Just a follow up. Installed the unit. Was pretty simple in the end. I found which wire from which harness to crimp onto via the pin assignment table from the service manual. The hard part was initially trying to unhook the harnesses. Just could not leverage enough. In the end I had a closer look at behind the BEM via a mirror and noticed that I could slide off the BEM using a flat-head screw driver.

My next challenge is to fit the other one to wife's 07 Outlander.

BTW, cheers to Tee Jay 2. You were right on the money with the red/white cable. Pin 35 of harness B122 (the left most harness when viewed from behind the BEM.

Wish I had seen this sooner to help, I have that sensor install in my car and have since I bought it! Along with a few others.

Mike

Another update: Will fit a normally closed relay (utilising the acc wire) to turn the unit on/off when key is out/in. I was driving yesterday and had the doors locked. Did a loud sneeze and the doors unlocked.

ANother update: Have fitted a relay that has an NC terminal (bought from Aztronics in town. I rang Jaycar at Gepps Cross asking if they have relays with NC terminals and they said no. However when I went there to get some spade connectors, what do I find? relays with NC and NO terminals for half the price of Aztronics).

Anyhow, I have discovered that I've added a neat feature to the car. I normally drive with the doors unlocked. Now when turn the key to off, the doors unlock. Cool. Just need a way to lock them when the car starts moving.

Nice work. It would be good if you can do a technical DIY write up on this for any other members benefit.
I'd be interested in an auto lock/auto unlock feature too.

Nice work. It would be good if you can do a technical DIY write up on this for any other members benefit.
I'd be interested in an auto lock/auto unlock feature too.

DIY for the glass break sensor or the auto lock/unlock?

Pretty sure if you design it so the doors automatically lock when the car is in motion, they must also automatically unlock if you have an accident serious enough to deploy the airbags. Otherwise in the case of an accident you are trapped in the car.

From memory, cars fitted with airbags must auto unlock if deployed in an accident.

DIY for the glass break sensor or the auto lock/unlock?

auto unlock on turn of key

auto unlock on turn of key

Bill, that is an after effect of the DEI-506T. When the key is turned from Acc to Off, the relay loses power and so the NC terminal of the relay closes and thus provides power to the DEI-506T. The unit must be designed so that upon powering on, it triggers the doors to unlock. I remember seeing the LED on the DEI-506T light up for a second everytime I power it on.

From memory, cars fitted with airbags must auto unlock if deployed in an accident.

Not entirely. But 3rd Gen cars with BEM do have this feature.