2004 dodge ram pu

2004 Dodge Ram PU with OEM alarm system.

Compustar 2WFM-S-PRO remote starter

Problem: Resistor values that are stated for the truck do not work. I've used 2005 resistor values that will lock the doors and arm the OEM alarm but will not unlock and disarm the OEM system. I used 335 ohm and this will unlock the doors but will not disarm the OEM alarm system. I tested the VIOLET/LIGHT BLUE wire with the DMM to test what the resistance on the wire is while turning the key in the driver's door and got 335 ohms when unlock, but this only unlocks the door.
I need to know if anyone here knows how to test for the OEM alarm disarm ?

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

according to directechs, its 820 to lock, 330 to unlock. Dont now what you had, but figured it was worth a shot. Also, have you tried the universal door lock module (456LW I believe). I had a similar problem with a newer dodge van, and went through an entire resistor pack with no luck... the module worked great.
HTH

kenny

-------------
Kenny
Owner / Technician
KKD Garage LLC
Albany, NY 12205

the Door Locks are a 1-Wire System, the LOCK requires a (-)Negative thrua 820 Ohm Resistor and UNLOCK requires a (-)Negative thru a 330 Ohm Resistor, For the 2004 model year vehicle, to ARM/LOCK will reuire a (-)Negative thru a 2000 Ohm Resistor and to DISARM/UNLOCK requires a (-)Negative thru a 480 Ohm Resistor. A Single Pulse thru the 480 will DISARM without Unlocking. Double Pulse to UNLOCKFor the 2005 model year vehicle, to ARM/LOCK will require a (-)Negative thru a 644 Ohm Resistor and to DISARM/UNLOCK requires a (-)Negative thru a 1565 Ohm Resistor. A Single Pulse thru the 1565 will DISARM without Unlocking. Double Pulse to UNLOCK

All those values are from Directechs and we tried all the values and NONE of them worked. Anyone else ??

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

I think you have the lock and unlock wire.  If you got a 330 ohm resistance then thats the actual lock/unlock wire.  Look for another wire..my other programs give the same result as in arm and disarming the system.

I know it's not the lock & unlock because the OEM alarm arms with the Compustar lock output. I just need to know how to test for DISARM seeing that the wire that I tested VIOLET/LIGHT BLUE did not give me a proper resistance when disarmed.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Here's what Astro has. PURPLE / Lt.Blue    lock/arm (NEG)- 1.8K    unlock/disarm   (NEG)- 450k  dbl pulse.

-------------

KarTuneMan wrote:

---

Here's what Astro has. PURPLE / Lt.Blue    lock/arm (NEG)- 1.8K    unlock/disarm   (NEG)- 450k dbl pulse.

---

Is this for the 04 or 05 truck ?

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

04...... Thet show 04, and 05 as the same!

-------------

Hmm Jeff, it's been a while since I've done one of those with a factory alarm, but I don't remember having to do anything special.

Like you said, since you're getting it to arm, you must already have the right wire in the truck.

--If you're not using relays, but instead are just using the outputs from the Compustar, you'll want to select a resistor that's a little smaller than the 480 that's listed.......try something in the 300-350 range.

--If the Compustar has flip-flop reversing-polarity lock outputs, and you're not using relays, don't forget to use diodes to block out the positive pulses from the Compustar.

--Look to see if the truck's domelight comes on when you're trying to unlock. The first pulse not only disarms the alarm, but turns on the domelight. If you get the domelight to come on, the resistor value must be correct.....maybe your unit's double pulse is too fast or too slow.

--Can your Compustar be programmed to pulse the ignition wire with unlock? As a last resort, you could do that, and just use the PURPLE / green regular unlock wire.

--Using the wrong resistor won't break anything. I would feel free to experiment with other-size resistors and see what you get.

I've done alot of these trucks here too ( I install for the local dealership that's 1 block away ). This truck is different than all the others as far as resistance values and I've heard that Dodge does this once in a while. The UNLOCK resistance on the VIOLET/LIGHT BLUE wire doesn't turn the dome light on meaning that it doesn't disarm the OEM security. While testing the VIOLET/LIGHT BLUE wire I have the resistors attached to the door lock wire and I physically ground it to the side of the parking brake frame cause it's close enough & all I want to do is to see if the resistance to ground is right & nothing I've used has disarmed the OEM alarm.

I do not want to use a module to control the door locks & alarm system because I've had several different modules on several different car give me grief with the databus. Learn from your mistakes and don't make the same mistake twice........ ( but in my case I think I did it 4 times

As far as the IGNITION pulse, I'm not sure if this will diarm the OEM alarm system, I haven't tried it but I'll ask the customer to do that and see if it does. If it does, then I can set up a relay to do that.

Kartuneman, I'll try those values too and see what I get.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

460 OHMS RESISTOR WILL DISARMS THE ALARM AND UNLOCK THE DOORS WITH A DOUBLE PULSE.

The resistance is only 20ohms different but its worth a shot.

Info is from audiovox.

-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Maybe ...2 wires system disarm?

the 456L  is not a data module, but a resistance learning module... it may be worth a shot... i've had success with them when hunting and pecking for resistor values was eating up too much time....

-------------
Kevin Gerry
Certified Electronics Technician
MECP First Class Installer

Owner/Installer
Classic Car Audio
since 1979

Reading into the Astrochart. On this truck the second igniton, is triggered with "ground while running" Slow down there... I know it's NOT ground, simply the timing of the energizing of this ign. wire. You might consider this as a try as well. I DO NOT know why it is said to be done this way. When I use Astro products, (which is all I use)  I don't ask ANY questions about their suggestions.  Use your "passkey" or ground while running, output to trigger a relay for this ign. wire!

I will send Patrick @ Astro an email and ask if this set up has ANYTHING at all, to do with O.E. security!

-------------

So this is what I ended up doing with this truck. I hooked up the ARM/LOCK with a 820 ohms resistor and the UNLOCK with the 335 ohm resistor but this did not disarm the OEM alarm system. Sooooo, what I did was wire in my OEM alarm disarm wire from the Compustar system and diode isolated this wire and attached it to the bypass module and status output wire. When unlocking the truck the disarm pulse triggers the bypass module and disarms the OEM alarm system while unlocking the doors.

What a pain.....

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Also, pulsing the IGNITION doesn't disarm the OEM alarm system for anyone that wants to know. The Compustar system have this option to pulse the IGN and/or ACC and this did not work.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

So, everyone have to compromise the security of the vehicle to get RS to work?

-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

No compromise here. When unlocking the doors the OEM security is disabled through the Sentry key and when remote starting the vehicle I have the system set up to UNLOCK before remote start and LOCK after remote start. So the system is active when remote started because of the LOCKING/ARMING after remote start

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

gotcha

-------------
Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).