Are the windows still stuck down? I wonder if the PCM is not powering up the ECM.

 

Yea they are still stuck. The service shop foreman just told me that the PCM (mounted on the firewall) is only for transmission control. So the even though their WiTech says "PCM" it actually means ECM.

 

Update:

Windows: I spent over an hour searching for the circuit breaker mentioned in the service manual - I am still not confident one exists in this model truck. Anyway, I finally got another switch to test and see if that's what it was - but the test switch didn't work. I checked the voltage at the pink/yellow pin/wire on the back on the power harness against the black pin/wire and it was 12 volts. So if there is voltage there, and the switch is not broken, then all 4 motors are dead.. unlikely. Then I realize the pin may be not contacting the switch correctly, so I just pinched the pin itself (the pink/yellow one) and sure enough, that was all it was.

The ECM: After rereading the service manual and talking to the folks at AutoEnginuity I figured out my ECM is, in fact, offline.

Initially I could not figure out what the controller on the firewall was called, and what it did, but I just hadn't read the service manual thoroughly enough -- it's the TCM, so the shop foreman at the dealer was correct. This means that any mention of a PCM (say, in the warranty book, right beneath the separate line that mentions TCM) is actually referring to the ECM. The confusion came from the TCM section of the service manual that mentions that the TCM may be integrated in the PCM, but that's not for the 6.7L. The device on the firewall is the TCM, and all of the powertrain controls are done by the ECM mounted on the engine block. Of course, the warranty book doesn't mention ECM, so the dealer is saying the labor operation comes back as not covered. (FYI, their computer also doesn't use the term PCM at all for this model. However, all the literature that AutoEnginuity gets from Chrysler on the CAN buses refers only to the TCM & PCM, not ECM.) So it's a bunch of minced wording that is making the warranty coverage an issue. Eitherway, as a last resort, I found a website that will send a new ECM, VIN and engine programmed for $700:

http://store.allcomputerresources.co...ram2535p6.html

At least the windows are up.

 

Also, in case anyone wants to see the service manual procedure, here's a segment from All Data -- Just a heads up, there are not 14 pins in the harness - so if you want to check for power just check the volts between the pink/yellow and the black -- also, I believe the fuse is #33, and there is no circuit breaker:

Your Vehicle: 2008 Dodge or Ram Truck RAM 3500 HD Truck 4WD L6-6.7L DSL Turbo
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Vehicle » Windows and Glass » Windows » Testing and Inspection


Testing and Inspection

POWER WINDOWS

WIRING VOLTAGE TEST

The following wiring test determines whether or not voltage is continuous through the body harness to the front switch.

Refer to the appropriate wiring information.

Remove the window/lock switch See: Body and Frame\Locks\Power Door Lock Switch\Service and Repair\Window/Door Lock Switch\Removal .
Disconnect wire connector from back of switch.
Switch ignition to the ON position.
Connect the clip end of a 12 volt test light to Pin 14 of the window switch harness connector. Touch the test light probe to Pin 10.
If the test light illuminates, the wiring circuit between the battery and switch is OK.
If the lamp does not illuminate, first check the fuse in the Totally Integrated Power Module (TIPM). Check the circuit breaker located near the park brake pedal. If fuse and circuit breaker are OK, then check for a broken wire.
POWER WINDOW MOTOR TEST

If the power window motor is receiving proper current and ground and does not operate, proceed with motor test.

Remove front door trim panel as necessary to gain access to power window motor wire connector See: Body and Frame\Doors, Hood and Trunk\Front Door Panel\Service and Repair\Front Door Trim Panel - Removal .
Disconnect power window motor wire connector from door harness.
Using two jumper wires, connect one to a battery (+) source and the other to a good ground (-).
Connect the Negative (-) jumper probe to one of the motor connector terminals.
Momentarily touch the Positive (+) jumper probe to the other motor connector terminal.
When positive probe is connected the motor should rotate in one direction to either move window up or down. If window is all the way up or down the motor will grunt and the inner door panel will flex when actuated in that one direction.

Reverse jumper probes at the motor connector terminals and window should now move in opposite direction. If window does not move or grunt, replace the motor.
If window moved completely up or down, reverse the jumper probes and cycle window to the opposite position to verify full operation.

If motor grunts and does not move, verify that regulator is not binding.

 

Just had the ECM replaced - that was why the truck wouldn't start.

 

I actually ordered an ECM from allcomputerresource.com and like 3 days later Chrysler offered to pay for all but $500. It ended up being cheaper to have them do it.

 

Man...I'm glad you got it figured out. Sorry we weren't much help. Sometimes you just have to be there.

 

No worries - it was weird. The only real evidence I had was that's autoenginuity scan tool would communicate with most modules, but not the ECM. And there were a couple codes like "[some module] cannot communicate with ECM/PCM".