FUNCTIONAL DESCRIPTION

The relay J36 controls the engagement circuit for the first additional heater resistance O25; the power supply for the relay switch arrives from the line for fuse F15 of the fuse box B1.

Relay switch J37 controls the engagement circuit for the other additional heater coils O25; the power supply for the relay switch arrives from the line for fuse F82 of the fuse box B1.

The coil for relay switch J36 is energised by a signal for the engagement of the first coil for O25A - from pin 12 of additional heater control unit M75.

The coil for relay switch J37 is energised by a signal for the engagement of the coils for O25B and C - from pin 6 of additional heater control unit M75.

The control unit M75 receives an ignition-operated power supply (INT) at pin 7 from the line for fuse F51 of M001.

Pin 1 of M75 is earthed.

Supplementary heater control unit M75 is connected – from pins 3 and 2 - via the CAN line, to Body Computer M1 and to the other network nodes.

The Body Computer M001 - connector A - receives a direct power supply from the battery through the line protected by maxi fuse F01 of the engine compartment junction unit B001.

The Body Computer M001 receives an ignition-operated (INT) power supply at pin 11 of connector E, whilst the ignition-operated (INT/A) signal reaches pin 1 of connector E.

Pin 9 of connector E of M001 provides the Body Computer with a reference earth.