04 1500 single cab door locks not working

[Bobby L]

I've searched the forum but I didn't see my condition so here goes.
Suddenly, the key fob only unlocked/locked the passenger door (single cab, two doors).
Two days later, the fob also stopped working on the passenger door too (2 key fobs tried, same results)
And, the driver's and passenger's door lock switches both do not function, not even a 'click'.
The two window switches on both sides still operate the windows.
When pressing the fob twice, for lock/unlock, the front side lights will blink once / twice but no horn chirp?
When pressing the panic button on the fob, it starts the horn going off at 1 scond intervals. Pressing the panic button again stops the horn.
I've replaced the driver's side main switch - no improvement.
I've used a spare battery to try and overide the driver's door switch at the door edge by touching the neg/pos leads to the neg/pos wires close to the switch - I couldn't activate the door lock switch in the door with this method??
I'm now going to pull the boot back in the door jam and inspect the wiring harness.
Does anyone have any other techniques to try? Much appreciated!

 

[Bobby L]

The wiring harness is ok. I disconnected the two battery terminals and touched and held them together for 10 seconds. I pushed in the trip meter knob and turned the key on/off - still not working

 

[Bobby L]

all fuses are good

 

[Bobby L]

no codes

 

[Bobby L]

the 'Door Ajar' light on the dash lights up when either door is opened while running

 

[Jigs-n-Fixtures]

Check the convolute tube which houses the wiring. The rear doors quit working on my 2008, and the problem was the wiring in the convolute tube had broken. Not terrible to replace. There are at least a few videos on YouTube on how to do it.

But mine being a Mega Cab made it harder to find a replacement harness. I ended up getting a harness for the crew cab and splicing in the part of the new harness which went back to teh first splice in teh stock harnesss. Worked fine. Except, me being color blind I screwed up the window wiring on the right rear door, so now the window goes in the opposite direction from the button. Not sure if I will take the door apart, to fix it or not. Got other more pressing projects.

 

[Fast69Mopar]

the 'Door Ajar' light on the dash lights up when either door is opened while running

Have you had an opportunity to download the 2004 DR Service Manual found in this forum? If for some reason you cannot locate the factory service manual here in the forum I have a PDF copy of it where you can look at the wiring diagram and the connector pinout of each door lock actuator and their respective wiring.

You said there were not any DTC's (codes) that were set. Which module were you looking for codes in? Any door lock or body related DTC's will be set in the FCM/IPM (Front Control Module/Integrated Power Module) which is attached to the side of the PDC (Power DIstribution Center) under the hood. You need a scan tool to see if there are any DTC's set in the FCM.

If you look at the wiring diagram for the 2004 DR power door locks you will see that the door lock actuators are not controlled directly by the switch. The passenger door lock switch power comes from Fuse 28 in the PDC. When you press the lock/unlock buttons on the door lock switch the signal is sent to the instrument cluster where the cluster uses a door lock driver to operate the door lock actuators.