08 dodge wont unlock

alright everybody i installed an aftermaket k.e. kit with a  keypad on the door on an 08 dodge 2500. the problem im having is that after so long it will only lock but not unlock unless i use the factory fob. ive seen posted a few others having the same prob but havent seen the fix.. any help appriciated.

what kind of keyless unit is it...does it have both +/- door lock outputs...? What do you mean "after so long it will only lock but no unlock..."? On some units that have +/- outs...you either need to add some diodes...or in some cases,relays...! If you unplug one ...lets say lock...does the unlock work...then try other side...But if you can get more specific...Like what unit you installed ...and does the un-lock ever work...Those are resistant base door locks right...?

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

alright for more specifics it is a marksman m2a im using a relay module so that it only puts negative pulses and i have resistors on the lines tied in between the switch and the i/p..... yes while the whole system is up you can lock and unlock all day long but if you let it set for more than an hour the unlock doest work but you can use the lock all you want and it will lock.. its like the body module is going to sleep

Sounds to me like you've taken your power supply from a "sleeper circuit" run your power supply from the battery, then try again.

my b+ wire is on the blue/red on the ignition column.if it was a sleeper the lock wouldnt even work.

Johnson, you might be wrong, certain circuits stay live for about 10 mins then dump, I've had 05 BMWs where the igniton live goes dead. Thus you've got power to lock, wait 10mins or whatever, then you've lost power. The only way to find out is to make a  temp. join to the battery.

Have you put your meter on the unlock wire when it is not unlocking...? Maybe start there and make sure your getting a good signal...

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

ive tested the system at even half an hour after the door is closed and it still works. it just when i let it sit for an hour or more that i have a problem.

Please satisfy my curiosity and run the power supply and ground to your vehicle battery, either that or use the vehicle every 20 minutes.

johnson73801 wrote:

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my b+ wire is on the blue/red on the ignition column.if it was a sleeper the lock wouldnt even work.

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This is NOT recomended for several reasons... the first and most important is it's fuse protection... 20 amps only.

Do as Howie suggested.

According to Directechs, the blue/red is fused at 2 amps. Not a good idea to use it. That is not what is causing your problem here though.

Try this...
Roll down drivers window, close all doors and lock the truck. Wait at least an hour, then reach in through the window and hit unlock on the drivers door switch. Does the truck unlock? My guess is it won't. The truck probably shuts down that circuit so a thief can not reach in through the window with a coat hanger and hit the unlock. You need to wake up the circuit when you pulse unlock.

I have never done this truck. I have been out of the industry for a couple years. My best guess is you will need to pulse either the drivers door pin when unlocking, or possibly the ignition wire. You will probably need to turn on double pulse unlock too.

Sounds like you may have a base model Ram. Does it have the OEM alarm? If not, I would probably just hook up the Factory Alarm Disarm output of the keyless unit to the drivers door trigger wire. If it doesn't have a FAD, then I would have the unlock output trigger 2 relays. One relay to pulse the unlock wire, the other to pulse the drivers door pin wire. If you have the OEM alarm, then things get more complicated.

alright i have made connections to the battery on this thing and still the same result... lock only with no unlock. ive also tried to trick the instrument cluster by pulsing the door ajar circuit and it unlocked but had no lock and it made the switch on the door only unlock the doors but in the incorrect position.

I would physically check the unlock resistor. They're prone to breaking when stressed since they're designed for mounting in a PC board and not with fairly heavy wires pulling on them.

I get around this by using part of a plastic cable tie alongside the connection for reinforcement when I tape it.

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C Renner's Auto Electronix
My service is cheap, quick, and good - pick any two

This wont help yoor problem...Just a comment about the resistors...I will use the insulation i have stripped from the wires while prepping the alarm...I then slide them on each leg of the resistor for protection...Just something i thought i would share...

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M.E.C.P & First-Class
Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

ok ive figured out the fix for this problem.......its just one relay and 5 wires.. b+ on 87 and 86 (-) trigger to 85  cut door unlock wire  and put vehicle side to 87a and motor side to 30.. this goes around the cluster for operation of the instrument cluster.