Preprogrammed Activation of Heater Operation

Preprogrammed Activation Of Heater Operation, Function

Shown On Models 215, 220:

Operating procedure
1 Basic requirements:
- Ignition (terminal 15) OFF.
- The stationary heater is switched off.

2 A preselection timer is activated in the instrument cluster (A1):
- The yellow indicator lamp in the STH switch (N72s12 or S46) illuminates and indicates activation.

3 If the preselection timer has expired, the yellow indicator lamp goes off and the instrument cluster (A1) transmits the "Stationary heater ON" signal to the STH or heater booster control module (A6n1) via the CAN Class B (CAN-B).

4 The STH or heater booster control module (A6n1) recognizes the cut-in signal, activates the menu for the stationary heater in the multifunction display of the instrument duster (A1) via the CAN Class B (CAN-B) and simultaneously starts the heat or ventilation inquiry in the operating and control module (N18, N22 or N22/7).

5 The operating and control module (N18, N22 or N22/7) activates, if present, its display field and compares the current in-car temperature with the preset temperature value.

6.1 Interior temperature < preset temperature value:
- The operating and control module (N18, N22 or N22/7) transmits the "Hear signal to the STH or heater booster control module (A6n1) via CAN Class B (CAN-B) and switches to stationary heating mode. The heat symbol is activated in the display field, if fitted.
- The STH or heater booster control module (A6n1) activates heater (A6) operation:
The green or red indicator lamp in the STH switch (N72s12 or S46) indicates the fact that heater operation is active by being permanently illuminated.

6.2 Interior temperature > preset temperature value:
- The operating and control module (N18, N22 or N22/7) transmits the "Ventilate" signal to the STH or heater booster control module (A6n1) via CAN Class B (CAN-B) and switches to stationary ventilation mode. If a display field is provided the fan symbol will be activated.
- The STH or heater booster control module (A6n1) initiates stationary ventilation and transmits the "Fan ON" signal to the operating and control module (N18, N22 or N22/7).
- The green or red malfunction indicator lamp in the STH switch (N72s12 or S46) indicates that stationary ventilation is active by flashing on and off.

Ignition (terminal 15) ON at expiration of preselect time
- Following the expiry of the preselect time, the instrument cluster (A1) cut-in time is suppressed, heater operation or stationary ventilation is not initialized.

Heater operation or stationary ventilation upon expiration of preselect time
- Following the expiry of the preselect time, the instrument cluster (A1) cut-in time is suppressed if heater operation or stationary ventilation is active having been manually initialized.