Serial Data

ECM is equipped with a serial data line. Serial date is a stream of electrical impulses which can be interpreted by special testers of other control modules. On some models, serial data must be accessed using special Scan testers connected to the Assembly Line Data Link (ALDL). Update intervals and information contained within the data stream vary with model application.

On models utilizing an ECM and Body Control Module (BCM), serial data may be accessed using the Driver Information Center (DIC) and Climate Control Panel (CCP). On these models, serial data may be shared with BCM, A/C controller, supplemental restraint controller, anti-lock brake controller, or even cruise control unit.