Hi. I am trying to install the directed electronics inc. 504k shock sensor into my 2003 Jeep Grand Cherokee Laredo. I would like to tie into the factory alarm system. The vehicle is two wheel drive and has the inline six cylinder engine. It is supposed to be a very simple four wire installation, but I am getting hung up on the connection for the door lock trigger/signal switch.
From the 504k shock sensor, I currently have the black hooked up to ground, the red hooked up to a constant hot,the green(warning switch) is capped off, and the yellow connected to a key ignition power source. The blue wire from the 504k sensor is the one I am having issues with.
I just acquired the vehicle and was hoping it would have the push button door switches that send out the signal for the open door trigger. Instead, it appears that the trigger/switch/sensor for the factory alarm is connected to the door latch. I had been warned that some vehicles were set up this way.
Before finding this site I attempted to tap into the wires coming out of the door to try to find the change in voltage with the door open and closed but I had no luck. I tried the front driver's door and the rear drivers door. Both had a tan/red wire that is supposed to be the "door ajar" switch. Oddly enough, the only voltage I was able to get was at the front driver's door tan/red wire, but the voltage with the door open was only 6 volts. When I connected the blue wire from the shock sensor to the tan/red wire from the door wiring the shock sensor would activate and the interior lighting of the vehicle would turn on, but there was no horn or flashing lights alarm response.
I decided to get online to see if I could find what I am missing in regards to the jeep door lock wiring and alarm triggering system. I found this article for the 2002 grand cherokee door wiring:
https://www.the12volt.com/installbay/forum_posts.asp?tid=12919
I also found this link for the 2004 grand cherokee door wiring:
https://www.the12volt.com/installbay/forum_posts.asp?tid=86799
I noticed that both articles state that there are four separate door trigger wires per vehicle, one wire per door. The first article says to use the yellow wire at the under dash light for the door trigger. Both articles say that on the 4.0L engine you can use any wire with a tan stripe at the coil pack when connecting to an alarm system.
I am hoping the yellow wire at the under dash light for the door trigger will give me the result I am looking for. I will be making another attempt tomorrow.
I apologize ahead of time if this has been covered already or if I am posting in the wrong place. I tried to research the articles and search the forums before posting, but the issues I found were a little different. Please let me know if you have any experience and/or advice installing these shock sensors on these year models of wj jeep grand cherokees.