The relay is activated by the engine management system.
Function of the digital engine electronics main relay:
Power supply of all components in the engine electrical system and electronics
Perceptible effect: - Engine does not run
A random collection of fault codes can be entered in the fault code memory of the engine management system if there was inadequate on-board supply voltage (e.g. due to deep discharge of the battery) or if there was a failure or contact fault of the digital engine electronics main relay.
If the faults 2ACB DME main relay, activation and 2ACC DME main relay, shift delay are stored either individually or jointly in the engine management system, all of the fault code memory content stored at the same mileage in the vehicle is to be ignored and deleted.
Under no circumstances may the engine management system be replaced!