A (negative) activation signal is sent from pin 7 of the switch control unit H090 to pin 35 of connector H of the Body Computer M001.

The Body Computer M001, provides the power supply, from pin 7 of connector H, to pin 8 for the switch control unit H090, for turning on the LED signalling the function is activated.

Pin 4 of the switch control unit H090 is connected to the centre dashboard earth C022 (connector A).

Having received the engagement request, from pin 19 of connector D the Body Computer M001 energizes the relay switch coil T14 located in the engine compartment junction unit B001. The contact closes and through fuse F30 a direct battery supply is sent to:

• from pin 4 of connector A of B001, the internal resistances for the defrosting of the left door mirror P060 (pin 8 connector A);

• from pin 5 of connector A of B001, the internal resistances for the defrosting of the right door mirror P061 (pin 8 connector A);

The left P060 and right P061 door mirrors are connected, via pins 2 of connector A, to the cab earth C100.

The Body Computer M001 receives a direct battery power supply at pin A of connector A; it also receives an ignition-operated supply (INT) at pin 2 of connector G.

This direct battery power supply is protected upstream by fuse F71 (CPL1) of the B099 maxifuse control unit on the battery (connector D).

It is connected to the earth of the central dashboard C022 (connector A) via pins 1 and 11 of connector G.