The Service 4WD light comes on then the remote access stops working the dash lights interior lights running lights and headlamps will not turn on.

Auto lamps or manual ?
The headlamps may be turned on 2 different ways. First, when the driver places the headlamp switch in the ON position, for manual operation. Second, with automatic lamp control ALC, and the headlamp switch placed in the OFF position.
The LH HDLP and RH HDLP fuse in the fuse block - underhood, supply battery positive voltage to both low and high beam lamps at all times. For manual operation , when the headlamp switch is in the ON position, the headlamp switch supplies ground directly to the headlamps and to the body control module (BCM) on the headlamp low or high beam signal circuit, depending on the position of the headlamp dimmer switch. The BCM uses this signal to determine if the conditions are present to illuminate the daytime running lamps or headlamps.
For ALC operation, the BCM receives a signal from the ambient light sensor indicating a low or high ambient (outside) light level. The ambient light sensor is a light sensitive transistor that varies its voltage signal to the BCM in response to changes to the outside (ambient) light level. Under the correct conditions the BCM grounds the headlamp relay control circuit energizing the headlamp control relay. The now closed relay supplies ground through the headlamp switch to the headlamps and the BCM on the headlamp low or high beam signal circuit, depending on the position of the headlamp dimmer switch. When the BCM grounds the headlamp relay control circuit, it also grounds the park lamp relay control circuit illuminating the park lamps. The headlamp relay is grounded at G203.
If the engine stalls with the headlamps in the ALC mode under low light conditions, the headlamps will be controlled OFF during cranking.
The conditions necessary for the BCM to activate the ACL mode are as follows:
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The ignition switch is in the RUN position.

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The headlamps are in the OFF position.

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The park brake is released.

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The BCM is receiving a low light condition from the ambient light sensor, if equipped with RPO T 82.

Do you know how to do electrical testing ? How to read a wiring diagram ? The running light's and the dash lights are powered by headlamp switch . When you turn the headlamps to park or headlamps on B+ voltage is sent to the BCM . Check for lose connection at headlamp switch . http://www.bbbind.com/free_tsb.html You can find free wiring diagrams at bbbind.com ! Videos on youtube for basic automotive electrical testing . The headlamp switch is an input to the BCM - body control module , do you know what that is ?

As far as interior lamps, there may be an interior dimmer, it rotates to increase or lower interior lamps, and usually includes the dash lamps.
If the lo beams work but not the hi beams, have to check headlamp dimmer switch.

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Jan 13, 2014 - 10 posts - ‎5 authors

The first thing that comes to mind is that the dash lights scroll dimmer is scrolled all the way in one direction which manually shuts off all the interior lights, even if a door is opened. At night turn on the parking lamps and then scroll the dash lights dimmer until the dash, radio face, overhead console, etc is brighter. Turn off the headlamp switch. Shut off the engine and exit the vehicle. Interior lights on? Hope this helps.

Check the tail light bulbs, check to make sure the dash lighting switch is turned up but not turned so far up that the interior lights come on when the door is closed.

The Central Timer Module (CTM, called BCM on some vehicles) supports or controls:
Automatic door lock/central locking
Battery protection
Chimes
Exterior lights (park lamps, fog lamps, headlamps)
Interior lights
Intermittent wiper control
Power lock control
Remote keyless entry (RKE)
Vehicle Theft Security System (VTSS)
Remote radio control (from steering wheel)

It covers all the problems you described except the 4WD controls. I suspect you may want to have the CTM checked, or do like I did and just replace it (used about $75-$100 on eBay). Make sure you get the part number on yours and match the number portion (not necessarily the two letter suffix) EXACTLY.
It should be located behind the kick panel to the left of the driver's feet (that's where it is on my 2003 Dakota), but may be to the right of the glove box (have to remove the glove box to get to it).

Well it could be the selector switch, but I doubt it.
Generally, the service light means something is not working that the computer controls. Solenoids and valves are a couple of possibilities.
The transfer case is shifted by solenoids commanded by the body computer based on the switch position on the dash.
You should be able to have a shop scan the body computer for trouble codes and proceed from there.
A basic code reader may not access the body computer.

Did you replace the DRL Relay in the fuse panel located on the drivers side dash? There is also one out in the fuse block under the hood.

look on the left of dash for the switch you turn your interior lights on turn it see if your dash light will brighten.turn up enough brighten dash lights. dont turn until it stop or your interior light will stay on.