HEATER - Functional description

Functional description

Climate control control unit M70 is supplied when the ignition is turned on (INT/A) at pin 3 of a line protected by fuse F31 from underfacia junction unit B2 .; it is supplied directly at pin 2 from a line protected by fuse F39 of underfacia control unit B2.

Pin 1 of M70 is earthed.

Recirculation actuator N82 is controlled by control unit M70, via pins 14, 15, 16 and 17.

The air mixing actuator N81 is controlled from control unit M70 from pins 23, 24, 25 and 26.;

The air distribution actuator N80 is controlled from control unit M70 via pins 19, 20, 21 and 22.

An electronic governer M72 controls fan N85 at different speeds via an earth command: this is ignition-operated (INT/A) from a line protected by fuse F31 of underfacia control unit B2. It receives a control signal from pin 10 of the control unit and returns a feedback signal to pin 18 of M70.ctronic governer

Fan N85 is supplied directly from a line protected by fuse F5 of engine bay control unit B1.

Pins 12 and 13 of control unit M70 connect to Body Computer M1 and node H44 [EL 1050] via the CAN line and exchange the following signals:

• battery voltage signal;
• rear window activation signal.