General Information

SIA IV

Models: E46 and E52

Production: From start of production

SIA IV Components:
- Instrument Cluster with LED display
- DME
- Vehicle Speed Signal

E46 Service Interval Display




Instrument Cluster (IKE, KOMBI) with LED Display
The Instrument cluster calculates the Service Interval. The cluster is also responsible for displaying the mileage reading for the next service.

DME
The DME provides the Fuel Consumption (ti) signal

ASC/DSC Control Module
The vehicle speed signal is provided by the ASC or DSC control module.

Principle of Operation




Starting with the E46 a new method for displaying the Service Interval is used. Colored LEDs are no longer used to display the amount of time until the next service or inspection is due.

With the SIA IV system, the actual mileage remaining until the next service will be displayed for five seconds when the ignition is first switched on.

The text "OIL SERVICE" or "INSPECTION" will also illuminate to show which service is due. A minus symbol( - ) before the mileage display indicates that a service is past due.

The calculation process for determining the service interval is similar to SIA III. A set volume is stored in the Cluster. The processor receives the ti signal from DME as the vehicle is driven. The Cluster also receives the vehicle speed signal from the ASC/DSC control module.

Based on the amount of fuel consumed and the distance traveled, the processor calculates the distance remaining to the next service.