Class 2 Serial Data Link
The Class  2 serial data link allows these modules to communicate
data with each other:
|     •  | Body Control Module (BCM) | 
 
|     •  | Driver Information Display Module | 
 
|     •  | Driver Seat Adjuster Memory Module | 
 
|     •  | Electronic Brake Control Module (EBCM) | 
 
|     •  | Inflatable Restraint Sensing and Diagnostic Module (SDM) | 
 
|     •  | Powertrain Control Module (PCM) / Vehicle Control Module (VCM) | 
 
|     •  | Transfer Case Shift Control Module | 
 
|     •  | Vehicle Interface Unit (VIU) | 
 
In addition, the Class 2 serial data link allows a scan tool
to communicate with these modules for diagnostic and testing purposes.  The
  Class 2 serial data link is located at the DLC connector.