Operation With Ignition On: Notes

When the ignition switch is in the ON position, the DICE uses the following information on the bus:

One radiator fan (2.3 L without A/C)

Coolant temperature (bus from TRIONIC)

Two radiator fans (2.3 L with A/C & 3.0 L)

Coolant temperature (bus from TRIONIC)
A/C pressure
Car speed (bus from MIU)
Outside temperature (bus from SID)
A/C system status (active/inactive)

The information is used in the DICE to determine whether the radiator fan/fans should be started or stopped.

To maintain idling speed constant, the DICE sends information on the estimated current consumption to the engine management system via the bus. The information is send 0.1 seconds before the DICE starts or stops the radiator fan/fans. The estimated maximum current consumption of the radiator fan/fans is:

One radiator fan (2.3 L without A/C)

15 A, low speed
23 A, high speed

Two radiator fans (2.3 L with A/C & 3.0 L)

9 A, low speed
37 A, high speed

When the conditions for high speed are fulfilled, low speed should be active for 2 seconds before high speed is activated. If high speed is active and the conditions for stopping both low speed and high speed are fulfilled, high speed is stopped immediately and low speed is stopped after 2 seconds.

NOTE: High speed cannot be activated until 15 seconds after the ignition has been turned on.

When A/C is requested, some conditions must be fulfilled in the DICE as well as TRIONIC for the A/C compressor clutch to operate. For further information with regards to A/C and its control, see A/C system .