rob_fed

I am looking for the wiring diagram for the power door lock actuators for my 2010 C300. More importantly the driver's side (left) front door.

I would like to find the the signal that makes the actuator lock and unlock.

I have disassembled outer and inner aluminum door panels. I tried to do some electrical testing as follows.

Visually, from the control module behind the door panel, I can trace the wire bundle to the door lock actuator.

There are 7 wires, but 3 are not related because they go the outside door handle sensor. Sensor wire colors are solid white, green, and brown.

Wire colors: Labeled as base color/stripe

All measurements were made from ground reference...

brown/pink - +12v no change when activating the door lock switch
brown/green - ground
grey/black - +12v when either lock or unlock switch is activated, +12v signal stays for about 2 seconds then goes to 0v
grey/blue - +12v when either lock or unlock switch is activated, +12v signal stays for about 2 seconds then goes to 0v


I tried different combinations of measurements between the different wires but nothing was apparent to provide a signal for "lock" or a signal for "unlock".

Since I am measuring the wires that I assume go to the motor directly, I would expect something to stand out. But nothing does.

Plutoe

post the VIN

rob_fed

WDDGF5EB2AF411618

Here it is, thanks.

Plutoe

I can't read your VIN, do you know if you have the code 882 or 885----additional locking feature on your car???

rob_fed

Probably not, from memory the only options that were noted were the HID headlights. The car is the base C300 Sport. I hope this helps. Door lock functions appear to be standard, lock and unlock with the key fob or insides switches. Hopefully I am not missing the point.

Plutoe

I was able to read the VIN on the office machine and you do not have the added theft protection code------In any event for your model there isn't a comprehensive central locking wiring diagram---they have functional schematics and can confirm that all your measurements listed below are correct for the function---the brown pink\green are the lines to the rotary tumbler switch and the other two are the motor leads--

Now my question is why did we go thought all this HS if the door control module and the rotary tumble switch\motor are functioning correctly???


All measurements were made from ground reference...

brown/pink - +12v no change when activating the door lock switch
brown/green - ground
grey/black - +12v when either lock or unlock switch is activated, +12v signal stays for about 2 seconds then goes to 0v
grey/blue - +12v when either lock or unlock switch is activated, +12v signal stays for about 2 seconds then goes to 0v

rob_fed

Hi Plutoe, I appreciate all of your responses. I am trying to understand the door lock actuator theory of operation to possibly interface a more readily available universal actuator. In my experience with a few w204's, the driver's side door lock actuator takes the most punishment from the most frequent use. And seems to fail first. This is the "why"...

The principle of operation of the universal actuator relies on a simple reverse polarity circuit to push in or out the actuator.

Per your description, does the "rotary tumbler switch" enable the lock and unlock function? Meaning the motor itself rotates in one direction and the the rotary tumbler switch mechanically controls the lock and unlock function.

Is there any information regarding the theory of operation?

Thanks,

-rob

Plutoe

For the drivers\passengers door lock the respective door control module controls the lock\unlocking----the switch and motor are just that a switch and motor!!

I suggest you spend the 20 bucks and get a 24hr subscription to MB Startek WIS-- put your VIN and look at the respective CL(central locking system) topic--there are hundreds of documents on the subject!!

rob_fed

Okay great! I can do that. Happy Holidays!