2753517 - E3020 WINDSCREEN WASH/WIPE - Functional description

Functional description

The steering column switch unit H005 sends the commands to the body computer node M001 for operating the windscreen wiper and washer motor via a negative signal, with reference to earth C020 connector B (from pin 2 connector B of H005).

Earth C020 is fastened to the passenger compartment floor and is located near the right front wheel arch (footwell area).

By turning the steering column switch unit internal switch A:

• position 1 (pin 8 connector A): operates the 1^st windscreen wiper motor speed;
• position 2 (pin 7 connector A): operates the intermittent speed (1^st speed);
• position 3 (pin 9 connector A): operates the 2^nd windscreen wiper motor speed.

The body computer node activates the 2 ^nd speed even when the steering column switch unit internal switch B is turned to position 1 (antipanic function).

Depending on the command received, the body computer:

• activates the 1^st speed supplying the windscreen wiper motor N015 from pin 9 connector B;
• activates the 2^nd speed by supplying the windscreen wiper motor N015 from pin 10 connector B.

The windscreen wiper motor power supply is provided by the body computer node and the line is protected by fuse F43 housed in the actual junction unit. The fuse is operated by a relay integrated in the body computer node which, depending on the speed requested, provides the power supply for the windscreen wiper motor from pin 9 or 10 connector B.

The body computer node receives the end of stroke position for the wiper arm at pin 8 connector C from the windscreen wiper motor N015. Turning the steering column switch unit H005 internal switch B to position 2 (pin 6 connector A), activates the windscreen washer function. The body computer node M001 provides the power supply, from pins 3, 4 connector B, for the windscreen washer pump motor N022. The supply line is protected by fuse F53, housed in the body computer node, and is operated by a relay incorporated in the junction unit.