Class 2 Serial Data Line

The class 2 serial data line is a ring/star configuration with discrete lines entering and leaving each module on the ring. This allows communications to the modules on the ring if one of the two discrete circuits is open.

The control modules on the ring portion of the class 2 serial data circuit can include the following modules:

• The audio amplifier
• The electronic suspension control module (ESC) w/F45
• The dash integration module (DIM)
• The electronic brake control module (EBCM)
• The inflatable restraint sensing and diagnostic module (SDM)
• The instrument panel cluster (IPC)
• The instrument panel integration module (IPM)
• The powertrain control module (PCM)
• The radio
• The rear integration module (RIM)
• The theft deterrent control module

The following modules are connected to the star portion of the class 2 serial data circuit by splices and have only 1 communication line connection to the class 2 serial data circuit. Therefore if the class 2 serial data circuit is open to any of these modules communication will not occur with that module:

• The cellular telephone module w/UV8
• The digital radio receiver w/U2R
• The drive door module (DDM)
• The memory seat module (MSM) w/A45
• The remote control door lock receiver (RCDLR)
• The remote control playback device - CD changer
• The steering column module w/N37
• The vehicle communication interface module (VCIM)