I recently had my catalytic converter stolen from my 2005 Prius. To protect my 05 and my 04 and 08, I installed cat shields and the Directed Electronics 507M Tilt Sensor to work with the factory alarm system. I dug around and there was fragmented information. As a service back to the community, I have compiled all the information in the attached document.
Did you use t tap connector? And to confirm, I only need to connect those 3 wires to "1H pin10, 1J pin 4, 1D pin 21" right?
Can you tell me where I went wrong? I connected the 3 wires as you showed in the diagram, but the alarm doesn't activate when the sensor is tilted. I made sure the alarm is working, by manually unlocking the car and opening the door. I didn't find a ground terminal in the sensor to connect it to the ground, could that be it? Or I have a bad sensor?
Hello Mark, On your relay wiring diagram it looks like both +12v constant and the tilt sensor red wire are attaching to pin 85. Is this correct? Thanks for your effort on this. Mike
i think i have that tilt sensor installed by a audio shop i will take a pic when I remove the trim pieces when my new ones come
Have you tested your tilt sensor on the bench to ascertain if it is faulty or not ? I am in the process of connecting a tilt sensor on my prius gen 2 but I am using a different product but it similarly negatively triggered input. I am planning to use an on/off switch to enable the sensor and a relay that will trigger the alarm i.e. the door switch. I am using a relay to reduce burning out the sensor and it does not have enough amperage to trigger the alarm.
Not sure how to test the sensor on the bench, but I connected the sensor, put flat on the dash while the window was rolled down, locked the car and put the fob in a metal container, waited about 30 sec for the alarm system to engage, then tilted the sensor with hand with no luck! I made sure the alarm is working by opening the door. I also bought another 506m sensor from another seller and tested using the same way above with no luck. If your sensor worked well, please let me know the model number and how did you connect it.
The picture attached is how I tested my sensor on the bench . I will post later how I used a relay to trigger the alarm on my prius . I used a relay because the resistance of the sensor that I got is not enough to trigger the factory installed alarm. I think the 507m can trigger it but it will burn out later due to the resistance load.
Mike - were you able to confirm that the +12V constant and the tilt sensor red wire are both connected to pin 85? The rest of the instructions are clear - just I have the same question as you do.
Thank you so much for collating this - made installation a breeze for me in my 2008 Prius. After my third Cat theft, I hope this will work as a further deterrent (I also have a shield etc). I've tested it with a normal hydraulic jack and it triggers the alarm at normal jacking speeds - for those worried that this won't trigger if jacked slowly, the thieves all use hydraulic jacks and they all jack it to height in less than 30 seconds. At least for my 3 data points anyway My only issue is that the sensor always seems to trigger about 40-60 seconds after I switch the car off, and so I always have to turn the car off and on again after this, which arms it properly. This isn't too much of an issue, but is problematic/embarrassing if I (or my wife!) lock the car before this and walk away as the alarm goes off (or if the alarm hasn't armed yet it stops the alarm from arming, as it shows an open door). My question to you, Mark010101, does your setup exhibit the same behaviour, or have I done something wrong?
It looks like I may have solved it - cutting the white wire loop on the 507m adds a 2 minute delay before arming. In the default setting, it arms after 10 seconds of having power (car off) - I think this was not enough time for it get a good baseline, hence the trigger. Not sure though, and I'll update if this didn't actually fix it.
Mike, I know this is a two year old thread, but have been reading through. I got hit by the cat thieves again last week, third time in three years, “shield” didn’t slow them down. So digging through how to add tilt and/or motion detect. Something I just noticed in the full car schematic that might have been contributing to the burned up tilt sensors is the driver’s door switch pulls down a connection to ground not only from the Body ECU, but also from the Brake vacuum pump. Ever noticed that it primes when the driver gets in? Maybe this is the burn up issue and a simpler fix would be to use the passenger door switch instead, which is 1D Pin 24 instead of 1D Pin 21?
