The automatic transmission control unit (Transmission Control Module, TCM) in the Mercedes-Benz W203 is located in the following places depending on the model and year of manufacture:
For W203 models up to 2004:
*Under the hood, on the left side next to the air filter
For W203 models from 2004 to 2007:
*Under the hood, on the right side, next to the battery
The exact location can also be determined by the following features:
* Usually the automatic transmission control unit has a silver or black cover.
* It can be attached to a bracket or located directly on the automatic transmission housing.
* It usually has several electrical connectors connected to it.