here you go
for the ECM, sorry i left that part out
The Dodge Journey trailer wiring diagram outlines the electrical connections necessary for towing a trailer, including the configuration of wires for lights, brakes, and turn signals. Typically, it includes a 4-pin or 7-pin connector wiring scheme, detailing the color codes for each function (such as brown for tail lights, yellow for left turn signals, and green for right turn signals). For specific diagrams, it's best to consult the vehicle's owner manual or a repair guide, as they provide the most accurate and detailed information for your model year.
you do not need the extra 7 pin if your not running electri brakes
You need a 7 pin circular to 4 pin flat adapter. www.trailvoy.com
sfn
You need to specify what type of connector. Most likely, you'll be using a seven blade connector, although six pin, five pin, and four pin connectors are also a possibility. The latter two would only be used if your trailer was not equipped with trailer brakes.
The hitch on my 2002 comes with a 4 pin flat plug. But it really depends on the trailer plug. There are adapters for the 5 pin round plugs but you need a brake controller if your trailer has brakes.
www.wimtv.be/techniforum/files/crt2574_deh-3300r.pdf page 51 shows pin out diagram.
To test a trailer harness with a multimeter, first ensure the vehicle is connected to the trailer and that the vehicle's lights are on. Set the multimeter to measure DC voltage and probe the appropriate pins on the trailer connector based on the wiring diagram for the harness. Activate the turn signals, brakes, and running lights one at a time to check for the correct voltage at each pin. If the readings match the expected values, the harness is functioning properly; if not, there may be a fault in the harness or vehicle wiring.
To hook up trailer lights on a 2003 GMC Sonoma, first locate the trailer wiring harness connector, usually found near the rear of the truck, often under the bumper. Use a wiring adapter that matches your trailer's plug type (typically 4-pin or 7-pin) and connect it to the harness. Secure the connections and test the lights to ensure they are functioning properly. If needed, consult your vehicle's manual for specific wiring diagrams or troubleshooting tips.
If it is the factory radio, then the pin-outs diagram should be stamped into the metal on the radio it-self.
try the12volt.com i know for a fact thay have one Try http://www.ahdol.com/ for the diagram.