So I just had my headliner replaced and ever since then I've had issues...

#1 - Dome light and power locks did not work - Fixed by replacing fuse #9
#2 - After replacing the fuse dome light will not turn off.

Troubleshooting Completed:
Started Car - tested both positions of the on/off switch for always on dome light button (no effect)
Started Car - tested both positions of door open control for dome light control (no effect)
Started Car - tested both positions of door open control for dome light and the always on dome light switch (no effect)
I've also looked through as many guides on the forum as I can find to no avail.


I've temporarily pulled fuse #9 to not drain the battery, but this also means I have no power locks currently.

My guess is that they took the dome light down to complete the replace the headliner and it is somehow now wired incorrectly, I am not overly mechanical so I'm not sure how it should be wired or how to take down the entire dome light assembly without ruining my brand new headliner.

Any thoughts would be greatly appreciated.

 

If you are uncomforatable doing the troubleshooting and repairs yourself I would take the car to a independent MB repair shop.
If you are feeling like you can venture out and fix this one your self I have provided the information to get you a good start below.
I pulled this from the service manual available for download from this forum from the link I provided below. Please follow up with us so we all may learn what you find.
https://www.crossfireforum.org/forum...ollection.html
Starting on 8L-129 has the troubleshooting steps. 8L-149 has the below steps for removal.
REMOVAL
1. Disconnect the negative battery cable.
2. Using a trim stick (1), gently pry down and away
from the courtesy lamp switch/unit body (2) to
release the lens cover.
ZH LAMPS/LIGHTING - INTERIOR - SERVICE INFORMATION 8L - 149
3. Remove the retaining screws.
4. Using a trim stick, gently pry and lower the courtesy
lamp switch/unit from the headliner opening.
5. Disconnect the courtesy lamp switch/unit harness
connector and remove from the vehicle.
INSTALLATION
1. Connect the courtesy lamp switch/unit harness
connector (1) and align into the headliner opening.
2. Install the retaining screws and secure.
3. Install the lens cover into the courtesy lamp switch/
unit body.
4. Connect the negative battery cable.

 

So I took apart the dome light assembly just now, and it appears pretty basic... simple on/off switch and a conditional switch based on feedback from the doors/trunk. I don't see how they could have messed it up. The wiring going into it is gated to prevent it from being hooked up backwards. I'm not sure where to go next.

 

I would follow the troubleshooting steps. 8L-129 has them in the service manual. It does look pretty straight forward. Check for shorts to ground. If you don't have a multi-meter they are pretty cheap at most auto parts stores. If you need to learn how to use it just PM and I will help you.
DOME LAMP CIRCUIT (CONTINUED)
When Monitored and Set Condition
² When Monitored: With the ignition on.
² Set Condition: The Body Control Module (BCM) reports a short to power, ground, or an open on the Dome
Lamp circuit.
POSSIBLE CAUSES
DOME LAMP CIRCUIT SHORT TO VOLTAGE
DOME LAMP CIRCUIT SHORT TO GROUND
DOME LAMP CIRCUIT OPEN
BODY CONTROL MODULE INTERNAL FAILURE
For a complete Interior Lamps Circuit Diagram, (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - INTERIOR - SCHEMATICS
AND DIAGRAMS).
Diagnostic Test
1. MEASURE THE RESISTANCE OF THE DOME LAMP CIRCUIT
Turn the ignition off.
Disconnect the BCM harness connector.
Disconnect the Dome Lamp harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Dome Lamp circuit between the BCM
harness connector and the Dome Lamp harness connector. (Dome lamp #3 pin to BCM C4 Pin 8)
Is the resistance below 5.0 ohms?
Yes >> Go to 2
No >> Repair the Dome Lamp circuit for an open.
Perform BODY VERIFICATION TEST.
ZH LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS 8L - 129
DOME LAMP CIRCUIT (CONTINUED)
2. MEASURE THE VOLTAGE OF THE DOME LAMP CIRCUIT
Turn the ignition on.
Measure the voltage of the Dome Lamp circuit between the Dome
Lamp harness connector and Ground.
Is voltage present?
Yes >> Repair the Dome Lamp circuit for a short to battery.
Perform BODY VERIFICATION TEST.
No >> Go to 3
3. MEASURE THE RESISTANCE OF THE DOME LAMP CIRCUIT
Turn the ignition off.
Measure the resistance of the Dome Lamp circuit between the Dome
Lamp harness connector and ground.
Is the resistance below 10K ohms?
Yes >> Repair the Dome Lamp circuit for a short to ground.
Perform BODY VERIFICATION TEST.
No >> Replace the Body Control Module. (Refer to 8 - ELECTRICAL/
ELECTRONIC CONTROL MODULES/BODY CONTROL/
CENTRAL TIMER MODUL - REMOVAL).

 

So another friend took apart the dome light assembly and found the problem. There are 4 metal strips that act as contacts / wires / whatever into the wiring that leads into the system, it was bent just enough to short out the next contact from when they reinstalled it. I didn't notice when I took it apart.

We wrenched it back to a straighter line with some needle nose pliers and that seems to have resolved the issue.

 

Another good example of making sure you check the simple basic things first.
Glad you found the problem and fixed it. Thanks for letting us know what happened.