Check Control Module (E38 start of production up to 9/95)

The Check Control System in early E38 models utilizes a self-contained Check Control Module (CCM).

The CCM is located in the electrical carrier in | front of the glove box.

This module collects and evaluates all check control data, including messages from the Lamp Control Module (LM).

Fig 1: Locating Control Module (E38 Start Of Production Up To 9/95)

Courtesy of BMW OF NORTH AMERICA, INC.

When the driver needs to be informed of a problem, the CCM signals the IKE over the I-BUS. The IKE will then post the message in the instrument cluster matrix display.

Fig 2: View Of Instrument Cluster Matrix Display

Courtesy of BMW OF NORTH AMERICA, INC.

The text and operation of the E38 check control was changed to improve message interpretation and reliability, for example:

GONG. Pre E38: Gong with every new display.
E38: Only activated for first display in group.

Advantage: Reduces driver's irritation.
DISPLAY: Pre E38: "Owner's Handbook" used repeatedly
E38: "Owner's Handbook" phrase deleted. Actual text for situation with recommended action.

Advantage: Driver can asses situation without reading the Owner's Manual.

All the warning messages fall into one of four priority groups.

Priority Group P1 - Faults that directly affect the safety or operation of the car and the drive should be addressed immediately. The text is displayed with a flashing arrow on the right and left sides.

Fig 3: Identifying Priority 1 Fault Display

Courtesy of BMW OF NORTH AMERICA, INC.

Priority Group P2 - Faults that do not affect vehicle's safety or operation directly and the driver need not respond to immediately. These messages are displayed only once when the fault occurs and have to be called up again with the CC button.

Fig 4: View Of Priority 2 Fault Display

Courtesy of BMW OF NORTH AMERICA, INC.

Priority Group P3 - These faults are shown when the key is turned on before a trip. The faults in P3 are mainly fluid levels which are not assigned to P2. The lights on reminder is a Priority 3 item. With the key in position 0 with the light switch On initiates this reminder.

Fig 5: Identifying Priority 3 Fault Display

Courtesy of BMW OF NORTH AMERICA, INC.

Special warnings - These are top priority messages and won't be overridden when displayed. Seat belt/ignition key in lock with door open are some of these messages.

Fig 6: View Of Special Warning Display

Courtesy of BMW OF NORTH AMERICA, INC.

When the key is switched off, all registered check control faults are displayed.

The language of the check control messages is set with the central coding key.