Check Control: Notes

When the check control system was introduced on the E38, the Check Control Module (CCM) was a self-contained unit up until 9/95 production. E38 models from 9/95 production used a check control module which was integrated in the LCM.

The E39 and E53 vehicles used the integrated CCM from the start of production.

The early version 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 or LCM).

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 1: Identifying Check Control Module (CCM)

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Check Control Communication Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

The text and operation of the E38 check control has been changed to improve message interpretation and reliability.