This table identifies which serial data link that a particular module uses for in-vehicle data transmission. Some modules may use more than one data link to communicate. This table is used to assist in correcting a communication malfunction between the control module and the scan tool. For the description and operation of these serial data communication circuits refer to Data Link Communications Description and Operation .
Control Module | Data Link Type | Diagnostic Procedure | ||||
|---|---|---|---|---|---|---|
Schematic Reference: Data Link Connector Schematics | ||||||
Chime | Class 2 | |||||
Electronic Brake Control Module (EBCM) (JE3) | Class 2 | |||||
Engine Control Module (ECM) (LG4, LLY) |
| |||||
Glow Plug Control Module (GPCM) (LG4, LLY) | High Speed GMLAN | |||||
Inflatable Restraint Sensing and Diagnostic Module (SDM) (AJ3, AK5) | Class 2 | |||||
Instrument Panel Cluster (IPC) | Class 2 | |||||
Powertrain Control Module (PCM) (L18) | Class 2 | |||||
Radio (U1C, UM6, UM7) | Class 2 | |||||
Serial Data Gateway (SDG) Module (LG4, LLY) | Class 2 | |||||
Transfer Case Shift Control Module (NP8) | Class 2 | |||||
Transmission Control Module (TCM) (MX4, MTW) |
| |||||
Vehicle Communications Interface Module (VCIM) (UE1) | Class 2 | |||||
