I am installing a remote start in my 2012 3.8. I am almost done. Lock, unlock, and trunk release buttons on the compustar remote work as they should. When you press the remote start button, the parking lights flash once, the ignition turns on, but it does not crank or start. I get a parking light flash pattern of 3 flashes, then a pause, then 5 flashes. This indicates a "foot brake on" error. I wired the relay for the brake switch just as it is in the diagram. 12V positive to pins 85 and 30, brake negative output from remote start module to pin 86, and both the brake positive input from the remote start module and brake 12V positive wire from the brake switch joined together at pin 87. I can't figure it out.
Long update but trying to include as many details as possible. I have made some progress with diagnosing this foot brake on error. I discovered that there is 9 volts flowing through the ground wire of the remote start module. This 9 volts of current is flowing through the ground wire of the remote start module even when the ground wire is disconnected from the grounding point. This main harness also includes two 12V+ wires, an ignition wire, and parking light wire.
Also, the same amount of voltage that is flowing through the ground wire is also flowing the brake+ input wire, even when it is disconnected from the brake wire switch. So to sum it up, the ground wire and brake + input wires from the remote start module both have 9 volts flowimg through them, even when disconnected. The brake + input wire should only have voltage flowing through it when the brake pedal is pressed down. The way this wire works is it connects to the vehicles brake switch wire that shows 12V when the brake pedal is pressed down. When the brake pedal is pressed down, the 12V is then sent through this brake + input wire, telling the remote start module that the foot brake is pressed down. This is what allows for the take over process when you get in your car after remote starting it, where you press on the brake and the remote start module shuts down and the engine keeps running as if you started it with the key, then you can put it in gear and drive. As a result of the brake + input wire always having voltage flowing through it, even when disconnected, it is communicating to the remote start module that the foot brake is on, creating this error. The voltage flowing through the brake + input wire even when disconnected, only happens when the main harness for the remote start, which includes the ground wire, is plugged into the remote start. When I unplug the main harness from the remote start module, which includes the ground wire, there is no longer voltage flowing through the brake + input wire. As soon as I plug in that main harness that includes the ground wire, there is voltage flowing through the brake + input wire again, as well as the ground wire, so the voltage running through the ground wire is transferring over to the connector that has the brake + input wire. So clearly my main focus should be determining how / why voltage is flowing through the ground wire, and seeing if it is something that I can fix. Also, there is 7 ohms of resistance in the ground wire.
What should be the next series of testing I do with my multimeter? Or, is it more than likely an internal fault of the remote start module? What are some of the possible causes of 9 volts flowing through the ground wire? I ordered a new remote start module (same model) which will be arriving tomorrow (12/7). Im going to see if the new module fixes it, then that would confirm the current remote start module has an internal fault.
Thanks in advance for any guidance and/or any additional testing I can do to narrow it down.
