Service & Maintenance - Overivew - All Models BMW X5 E53

Purpose Of The System

The Service Interval Indicator System is designed to alert the driver when the vehicle is due for service. Recent advances in the materials used in engine construction along with low emission engine management systems and the use of high performance synthetic oils have increased distance between services to approximately 15,000 miles.

The Service Interval Indicator System helps to reduce the confusion and inconvenience of computing maintenance intervals based only on mileage. Rather, the intervals are based on the owners specific driving style.

When the SIA determines the time for a service that is necessary, it displays the service (Oil Service or Inspection) in the instrument cluster and remains displayed until the system is reset and a countdown for the next service is started.

Production: 1986 Up To 1996

(E36 and E36/7 up to 1999)

Scheme 357

Instrument Cluster With LED Display

The Instrument Cluster is responsible for calculating the Service Interval and displaying the LED blocks used to represent time until next service.

DME

The DME control module provides the engine speed signal used in the SIA calculation.

Vehicle Speed Input

The vehicle speed input is provided directly by a reed switch in the differential (E32, E34, E31, E36), or from a processed signal sent by the Braking and Traction (ABS/ASC) control module (E38).

Engine Temperature Sensor

The engine temperature NTC sensor provides the engine temperature signal used in the SIA calculation.

Principle Of Operation

The Service Interval Indicator consists of a row of LEDs and two text messages.

Scheme 358

"OIL SERVICE" or "INSPECTION". The LEDs show the length of time remaining until an Oil service or Inspection is due. The SIA II display uses 5 green LEDs, one yellow and one red LED.

The Display LEDs are only illuminated when the ignition is first switched on. The display remains for approximately eight seconds before being switched off. The countdown to a service on a new or recently serviced vehicle starts out with all green LEDs illuminated. Over a period of time and mileage, the green LEDs will be turned off one by one. When a service is due, all green LEDs will be out and the yellow LED will be illuminated along with the text message "OIL SERVICE" or "INSPECTION".

If the service is not performed the red LED will illuminate after an additional 1000 miles has accumulated.

The calculation that the instrument cluster or IKE (E38) uses to calculate service interval is based on three pieces of data

1. Engine Speed (RPM)
2. Distance Traveled (miles accumulated)
3. Engine Temperature

The use of Engine Temperature and RPM for the calculation allow for a more precise estimation of when a service is required by taking driving styles into account. A vehicle for example, that is driven aggressively or for short distances in stop and go traffic may require servicing more often than a vehicle that is driven longer distances on freeways.

Workshop Hints

When a service is performed the Service Interval Indicator must be reset. For vehicles equipped with SIA II there is only one method

1. Reset using special tool

The SIA is reset using the SIA reset function, the tool creates a pulse width modulated signal on the DIASIARE lead (Diagnosis-Service-Interval-Reset-Lead) , pin 7 of the diagnostic connector.

Scheme 359

1. Oil Service Reset button
2. Inspection Reset Button
3. Yellow LED for Oil service Reset
4. Green LED for communication acknowledgment
5. Red LED for Inspection Reset

1. Insert special tool 62 1 110 into the diagnostic connector. If the vehicle uses a 15 pin diagnosis connector use adapter 61 2 060.
2. Turn the ignition to position 2
3. Push and hold the button to reset the applicable service: Oil Service or Inspection. Button 1 or 2 respectively.
4. The reset tool has three LEDs below the reset buttons. The green LED (4) in the center comes on whenever any service reset is selected to indicate that communication is OK. The other two LEDs (3 and 5) indicate that the proper reset (Oil Service: yellow or Inspection: red) is being carried out.

Instrument Cluster Replacement

If the Instrument Cluster is replaced on early vehicles the SIA data is lost. Redundant data storage is available for the following models

1. E31-Data stored in EKM and LKM
2. E36-(1997-1999), E36/7- Data stored in cluster EPROM and Coding plug.
3. E38-Data stored in IKE and LCM

If a Cluster is replaced on a vehicle with redundant data storage, the transfer of the SIA data (along with total miles) is possible.

Diagnosis

Diagnosis using the Diagnosis program is possible on vehicles whose clusters are on the diagnostic link: E32, E34, E36 (except E36/5, /7 up to 9/98) and E38.

The tools available to diagnose the SIA system in the Diagnosis Program are

Scheme 360

Models: E38, E39, E53, E36/5, /7

Production: 1996 onward excluding E36 (except E36/5 and E36/7 from 9/98)

Scheme 361

Instrument Cluster (IKE, KOMBI) With LED Display

The Instrument cluster calculates the Service Interval. The cluster is also responsible for displaying the LED blocks used to represent time until next service.

The DME provides the Fuel Consumption signal (ti) as the only signal used in the SIA calculation.

The sequence for displaying the necessary service is similar to SIA II. The calculation method however differs significantly.

The Instrument Cluster calculates the Service Interval based only on the input of the "ti" signal (Fuel Used) from the DME. This method gives an accurate indication of engine load and the need for service.

The SIA data for the specific model is coded into the instrument cluster. The data consists of a Stored quantity of fuel, referred to as the "Coded Inspection Limit". The "Coded Inspection Limit" varies according to model and can be viewed using the Diagnosis Program.

The processor of the Cluster receives the ti signal when the vehicle is used. As 20% of the stored volume is consumed one of the green LEDs will go out. Each successive 20% of fuel consumed will cause the next LED to go out until 100% of the stored value has been consumed. At this point the yellow LED comes on indicating the service that is necessary. At 108% of the volume, the red LED will illuminate indicating a service which is overdue.

Scheme 362

When the Service Interval Indicator is reset, the total stored volume of fuel is restored in the cluster and the calculation starts over again.

Reset of the SIA III is possible

1. Using the Reset Tool as explained in SIA II Workshop Hints (up to MY 2001).
2. Using the Reset Mode in the Instrument Cluster (E39/E53 MY 2001 onwards).
3. Using the Reset Test Module in Service Functions

Reset Procedure Using The Reset Mode

1. Ignition key must be "off"
2. Press and hold the trip odometer reset button in the instrument cluster (left button), and turn the ignition key to the first position.
3. Keep the button pressed for approximately 5 seconds until one of the following words appear in the display: "OIL SERVICE, or "INSPECTION", with "Reset".
4. Release the reset button and press it again until "reset" begins to flash in the display. The service due, is shown with "reset", if the coded minimum consumption limit has been reached and resetting is possible. If "reset" is not shown, the minimum limit has not been reached and resetting is not possible.
5. While "reset" is flashing, press the left button briefly to reset the service interval. After the display has shown the new interval, the following will appear: "END SIA"

The system can only be reset again after 10 liters (2.5 gal) of fuel have been consumed.

Scheme 363

If the instrument cluster (IKE or Kombi) is replaced the SI data can be retrieved from the LCM on E38, E39, and E53 vehicles.

Replacement of the Kombi or IKE is only possible with a new component.

Leave the old cluster in the vehicle. Using the ZCS coding program, adopt the code from the old part.

Install the cluster and transfer the saved code to the new part. This procedure will ensure that the correct total miles and SIA data are transferred.

If the old part cannot be read, the LCM will provide a redundant location to allow the coding program to restore the total mileage and SIA data.

Scheme 364

If the cluster is replaced in a vehicle equipped with a coding plug (E36/7 after 9/98) the procedure differs.

1. Code the cluster using ZCS coding. The cluster will display the correct mileage and SIA data except that the "Manipulation" dot will be illuminated.
2. Use test step 16 to copy data from the coding plug.

Diagnosis of the SIA System is carried out using the Diagnosis program from the DISplus or MoDiC III.

The tools available to diagnose the SIA system in the diagnosis program are

Scheme 365

Read SIA Data

The SIA data coded into a vehicle (Coded Inspection Limit) can be printed and attached to the repair order.

This is required in cases when the instrument cluster indicates that maintenance is required, but the vehicle has lower than expected mileage.

In a small number of cases it may be that the instrument cluster was coded with the incorrect Coded Inspection Limit and will have to be re-coded.

The display of SIA data on the DISplus or MoDiC III also shows "Stored Consumption". Stored Consumption (in gallons) is the amount of fuel consumed towards the "Coded Inspection Limit" (in gallons also). When the two numbers become equal, the instrument cluster indicates that service is required. When a reset is performed the Stored Consumption is reset to zero.

This feature is available in diagnosis for all vehicles using the SIA III method of calculating service intervals.

Scheme 366

From Start Of Production

SIA IV Components

Scheme 367

1. Instrument Cluster with LED display
2. DME
3. Vehicle Speed Signal

The Instrument cluster calculates the Service Interval. The cluster is also responsible for displaying the mileage reading for the next service.

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.

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.

Scheme 368

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.

Reset of the SIA can be done using special tool 62 1 110 if the vehicle is equipped with the 20 pin under-hood diagnosis connector.

On 2001 MY vehicles onward without the diagnostic connector in the engine compartment, the use of the S. I. reset tool is not possible. The Service Indicator may be reset using the Reset Mode in the Instrument Cluster or with Diagnosis.

Reset Procedure Using The Reset Mode (Possible From 9/99 Onward For E46, MY 2001 E52)

1. Ignition key must be "off"
2. Press and hold the trip odometer button in the instrument cluster (left button), and turn the ignition key to the first position (KLR).
3. Keep the button pressed for approximately 5 seconds until one of the following words appear in the display: "OIL SERVICE, or "INSPECTION", with "reset".
4. Release the reset button and press and hold it again until "reset" begins to flash.
5. While the display is flashing, press the left button briefly to reset the service interval. After the display has shown the new interval, the following will appear: "END SIA"

The system can only be reset again after 10 liters (2.5 gal) of fuel have been consumed.

Scheme 369

Reset Using Diagnosis Program

1. Connect the Diagnosis head to the diagnostic connector of the vehicle.
2. Identify the vehicle and perform the Short Test.
3. Select Function Selection and then Service Functions.
4. Highlight Reset Service Interval Indicator (Test module S6211-00001)
5. Select with tester.
6. Follow the directions from the help information in the test module (upper right corner).
7. Select which service is to be reset and press the continue key.
8. An acknowledgment is displayed on the screen that the reset has been carried out.

If the instrument cluster (Kombi) is replaced the SI data can be retrieved from the LSZ on E46 vehicles and from the LCM III on the E52. Coding procedures are the same as SIA II.

Diagnosis of the SIA System is carried out using the Diagnosis program of the DISplus or MoDiC III.

Scheme 370