2005 Dodge Caravan, Door Lock 2 Wires To Each Door

2005 Dodge Grand Caravan with factory RKE (not working) and factory security system (not working remote)

I am trying to install an EasyGuard EC206-B 2 Way car Alarm

My difficulty is that there are four wires coming from the BCM, 2 going to the Left door and two going to the Right door. The voltage pulse is 12v whenever the locks are triggered for lock or unlock. So it seems to be a reverse polarity system. Tan/White for Lock and Tan/Light Green for UnLock on the Left door and Tan/Brown for Unlock on the Right Front Door and Tan/Gray For Lock on the Right Front Door.


The alarm controller only has one wire for lock and one wire for unlock.


Am I supposed to Jumper the Lock wire from the two front doors together? And do the same with Unlock wires?

Just not sure how to go about this. Any advice appreciated.

Ground to the Orange and Orange/Black.
Power to Yellow and Yellow/Black.
Lock wires from both doors to White.
Unlock wires from both doors to White/Black

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Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

Spoken like a true professional :-)
You make it seem so easy. Thank you !!!

i am an idiot wrote:

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Ground to the Orange and Orange/Black.
Power to Yellow and Yellow/Black.
Lock wires from both doors to White.
Unlock wires from both doors to White/Black

---

Hello IAAI (or anyone else who might respond),
On this 2005 Dodge Grand Caravan.....

According to the User Guide that came with the alarm, the above instructions are for Aftermarket Actuators


However, when I measured the signal going to the door locks I got 12+ for unlock and 12- for lock.
I was thinking (possibly wrong) that this meant it was a reverse polarity system and would be wired accordingly?


I do not doubt the advice given, just curious as to how the aftermarket actuator pulses differ from the reverse polarity setup?

Thanks

i am an idiot wrote:

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Ground to the Orange and Orange/Black.
Power to Yellow and Yellow/Black.
Lock wires from both doors to White.
Unlock wires from both doors to White/Black

---

According to the installation instructions, this is the Positive/Negative Connection method, which seems like the correct method for this 2005 Dodge Caravan. But for some reason it isn't working.
When I measure the output in the OEM wiring I get 12v pulses but the alarm is only delivering 2volts. Odd. More checking needed.

Hello!

I am installing an alarm system in my vehicle. it is a Dodge / Chrysler vehicle.
It uses a 12v(+) signal for Unlock and a 12v(-) signal for lock (I guess this is a reverse polarity system?)
There are 4 wires going to each door lock motor assembly.
1). Ground Wire
2). PCI Bus Wire
3). Wire to side A of Door Lock Motor
4). Wire to side B of Door Lock Motor

I don't "think" there's a negative or positive wire per se...I "think" it just carries the 12v pulse from the BCM across the two wires in a reversed polarity depending on whether you push the Lock or Unlock buttons.
So, for example to Lock the door, the pulse travels one direction and when an Unlock is sent, it goes the other way...or reverses.
Like having a DC motor connected to a 12v DC battery....and switching the wires to the opposite terminals.

Anyway, it works great...UNTIL I plug the BCM connector back into the BCM at which point fuses are blown upon locking / unlocking (not sure which blows the fuse) and the locks no longer work.

So there is definitely a cross polarity issue going on. Problem is, I don't know how to correct it since if I put blocking diodes inline on the alarm wires, it blocks either the inbound signal when using the remote or it blocks the outgoing signal.
So it seems it needs a blocking diode, but you can't use one as it will block either the BCM function or the installed alarm remote function (my choice which).

The alarm has jumpers that allow you to select negative trigger door locks or Positive trigger...but neither works.

I can supply wiring diagrams and wire color codes, specific year and model of vehicle if all that would help.

Thanks for any replies (hoping).

Unless I'm having a unique issue with my vehicle, I surprised this hasn't been an issue for other installers?
Installing a reverse current/voltage door locking system that can work in unison with the factory locking system is a bit more complex than just connecting alarm wires (I think).

With reverse current locking systems (as with many Dodge / Chrysler vehicles it gets more complicated.
I'm mapping out the components and their connections and the switching needed but it's complicated.

I'll post the mapping when I figure out exactly what works. There may be some diodes involved but I'm not sure yet.

The alarm connection advice given in this section does not work on my 2005 Dodge Grand Caravan.
Door Locks - Dodge Caravan 2001 - 2005 Type H Relay Wiring Diagram

I carefully connected the Purple/Dark Green wire in C3 of the BCM (Pin 21) to the Unlock wire of the alarm through a 2K resistor.

The result is completely inoperable door locks with no response whatsoever from the door lock or unlock switch.

Upon disconnecting this connection, the door locks operate normally once again.
If I disconnect the BCM connector (C3) from the BCM with the alarm wires connected, they work.
The entire problem is that they cannot both work (OEM Door locks AND Aftermarket Alarm Door Locks) TOGETHER.

I think I'm going to have to use KiCAD to map out the entire schematic of the entire factory Door Locking System, the BCM internal Door Lock Schematic and the entire Aftermarket Alarm System Door Lock Schematics to finally resolve this correctly.


This does not work with my 2005 Dodge Caravan

Wire relays to pulse a stronger ground through the resistors.

https://jdmfsm.info/Auto/--General--/Autoelectric%20schemas/Alarm%20cables/DOWNLOADS/14301_CARAVAN_CHRYSLER%20MINI%20VAN%2001%20-%20UP%20%201%20WIRE%20ALERT%20SHELBY%20UNITS.pdf