DTC P1694 Ems Message Error: General Description

The ECM and the SMARTRA (BCM) communicate by dedicated line. During this communication of ECM and SMARTRA (BCM) the K line of ECM cannot be used for communication. The ECM controls the communication either to SMARTRA (BCM) or to other devices (e.g. scanner) on K line by switching of a multiplexer and specific communication procedures. The multiplexer is a part of ECM H/W.