I'm SO frustrated! Chrysler 1998 Town and Country LX 3.8L Gas only engine. Avital 4105L remote starter (1 way with keyless entry).
The lock/unlock system is a "1 wire type". For anyone who doesn't know, this means that on the NORMAL door lock/unlock switch in the car (assuming no remote start module has been installed yet), the door lock switch connects the SAME wire from the BCM to ground whether you are locking or UNlocking the door. The only difference is how much resistance there is in the connection. The switch has TWO different resistors in it. The BCM wire has a 5v signal at rest. When you LOCK the doors with the switch, you connect that signal wire to ground through a 1500 OHM resistor. When you UNlock the doors with the switch, you connect the SAME signal wire to ground through a 250 OHM resistor. Then, the BCM tells the PCM to ground the relay for either the lock or unlock function, depending on how much voltage drop the BCM sees when you flip the switch (more drop with locking than unlocking, because the resistance is higher through the LOCK resistor). When connecting the remote start module, the module is NOW taking the place of the door switch.
However,, you have to trick the BCM into thinking that it is the regular switch because the remote start module is
not designed with these different resistors in the ground path. The module is designed as if the car uses
different wires for lock and unlock, NOT the same wire through different resistances. Therefore, I wired in a 1500 OHM resistor between the lock/unlock harness at the remote start module (herein referred to as the "rsm") lock pin and the BCM 5v signal wire. I also wired in a 250 OHM resistor between the RSM unlock pin and the BCM 5v signal wire. The door LOCK function works perfectly. The UNlock function NEVER works! Please offer any thoughts or advice on how to troubleshoot or fix this issue. It is a BIG deal, b/c it means I'll have to carry both the factory and the RS key fobs at all times which is, let's face it, a pain in the ass!
Second problem: I am 100% positive I installed all the wires in the correct places. I tested them with a meter, I checked bulldog security,
and I have all the factory wiring diagrams right out of the factory service manual which I studied intently. However, the rsm will crank but
will not start the engine. I tried turning off the virtual tach feature and increasing crank time to 2 seconds but NOTHING is working. I have sunk over 20 hours into this installation already. PLEASE! Someone give me some troubleshooting tips to fix this SOB. There is a device called an auto-shutdown relay involved here which I think may have something to do with why it's not starting but I'm really not sure. Thanks so much to anyone who can help.