Proximity Sensor Need some advice

I have a 2005 Benz SLK350 (its a convertable)

And i am planning on adding a DEI proximity motion sensor into the factory alarm or additional alarm horn.

I purchased the PAC TR7 trigger, and the DEI 508D proximity module and programmed the PAC to Constant On from Pulse trigger. This part works great. However here is where i need some help:

I want the proximity sensor to turn on when i lock my car from the Benz Key remote, and Turn off the sensor, when i unlock from the remote. I was able to locate a trigger for this to work. There is a gas tank actuator that locks/unlocks with the alarm activating/deactivating.

The set up is 2 wires. #1 gets pulsed (+) when Lock is pressed on the key. #2 gets pulsed (+) when Unlock is pressed on the key. At rest they are both (-)

When i connected the PAC TR7 programmed for Pulse > Constant, to to #1 wire. I press Lock on the Key, and the motion sensor is on. But in order to deactivate i am forced to press the Lock again since it is only connected to #1 locking wire. If i connect both #1 & #2 wires (isolated from each other) to the (+) trigger on the PAC TR7, then i will be able to Activate the motion sensor along with the alarm, and deactivate the motion sensor when unlocked.

This is fine however is there a way i can connect the PAC TR7 and or other parts i may not have yet, so that the proximity sensor ONLY Turns on with the LOCK Button on the Key remote, and ONLY unlocks with the unlock button? So that in the case i hit Lock 2x it does not Activate then Deactivate the proximity sensor?

That is a good idea... How do i go about setting up a logic gate like that?

Thanks.

thanks a lot!

now i can continue this project...

regards,

Lenny

I double checked the PAC TR7 module, and it does not look like there is a way to get it to perform as a logic gate from 2 different triggers. it has a (-) trigger wire, and a (+), so the only way i got it to work was to connect both Unlock & Lock (+) triggers with Diodes to the (+) wire of the PAC module, which then would output 12v (+) to the proximity sensor.

I took a closer look at the cirucuit you designed above, excuse my lack of knowledge in the topic, but perhaps you can explain a bit further for me... Still learning here.

On Pin 4 - To relay toggle input... what is that supposed to connect to? Is this an output that would connect to the alarm? or a main trigger to enable the entire circuit? I take it this is the -input to your toggling relay- you wrote of in your comment with the circuit. If it is to activate the entire circuit, then i would connect my PAC module to it so that when i turn the car off, and remove the key, the PAC gives power to the logic circuit... correct?

Perhaps i explained my original post incorrectly. So here is a simplified version.... i hope:

Car already has the factory built in alarm from Mercedes.

Goal: attach proximity sensor with an addition siren, so that when i lock the car, proximity only turns on, and when i unlock the car proximity only turns off from the Mercedes Key remote.

Proximity alarm triggers: will connect to an additional siren, Not to the Benz alarm.

Triggers found: (+) pulse from Lock & (+) pulse from Unlock

So would the above circuit still work based on what i described?

Also, one other thing to note... The convertable roof opperates from the Key remote. Button sequence to open roof = 3 x unlock, button sequence to close roof = 3 x lock

I don't think this will play too much of an issue as the proximity sensor has a built in 30sec. timer before it is activated, and the roof opens and closes in 26sec.

Thanks for your help.

-Lenny