Conditions for Setting the DTCs
- No valid messages are detected on the class 2 serial data circuit.
- The voltage level detected on the class 2 serial data circuit is in one of the following conditions: High Low
- The above conditions are met for approximately 3 seconds.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Control Module References
| Control Module | Schematic | Repair Instruction | Programming and Setup |
|---|---|---|---|
| Diagnostic System Check - Vehicle in Vehicle DTC Information Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information Symptoms - Vehicle in Vehicle DTC Information | |||
| Cruise Control Module | Cruise Control Schematics | Cruise Control Module Replacement | Cruise Control Module Programming and Setup in Programming and Setup |
| Communication Interface Module (OnStar ®) | OnStar Schematics in Cellular Communication | Communication Interface Module Replacement in Cellular Communication | Communication Interface Module (OnStar) Programming and Setup in Programming and Setup |
| Digital Radio Receiver | Radio/Audio System Schematics in Entertainment | Receiver Replacement - Digital Radio in Entertainment | Digital Radio Receiver Programming and Setup in Programming and Setup |
| Brake Pressure Modulator Valve (BPMV) | ABS Schematics in Antilock Brake System | Brake Modulator Assembly Replacement (Without VSC) or Brake Modulator Assembly Replacement (With VSC) in Antilock Brake System | Electronic Brake Control Module Programming and Setup in Programming and Setup |
| Inflatable Restraint Sensing and Diagnostic Module | SIR Schematics in SIR | Inflatable Restraint Sensing and Diagnostic Module Replacement in SIR | Inflatable Restraint Sensing and Diagnostic Module Programming and Setup in Programming and Setup |
| Powertrain Control Module | Engine Controls Schematics in Engine Controls - 1.8L (LNK) | Powertrain Control Module (PCM) Replacement in Engine Controls - 1.8L (LNK) | Powertrain Control Module Programming and Setup in Programming and Setup |
| Powertrain Control Module | Engine Controls Schematics in Engine Controls - 1.8L (LV6) | Powertrain Control Module (PCM) Replacement in Engine Controls - 1.8L (LV6) | Powertrain Control Module Programming and Setup in Programming and Setup |
| Radio | Radio/Audio System Schematics in Entertainment | Radio Replacement in Entertainment | Radio Programming and Setup in Programming and Setup |
| Remote Control Door Lock Receiver | Keyless Entry Schematics in Keyless Entry | Remote Control Door Lock Receiver Replacement in Keyless Entry | Remote Control Door Lock Receiver Programming and Setup in Programming and Setup |
| Theft Deterrent Module | Theft Deterrent System Schematics in Theft Deterrent | Theft Deterrent Control Module Replacement in Theft Deterrent | Theft Deterrent Control Module Programming and Setup in Programming and Setup |
Control Module References
Data Link References
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. Some modules may have multiple communication circuits passing through them without actively communicating on that data link. This table is used to assist in correcting a communication malfunction. 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 (DLC) Schematics | ||
| Digital Radio Receiver (DRR) | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Electronic Brake Control Module (EBCM) | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Instrument Panel Cluster (IPC) | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Powertrain Control Module (PCM) | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Radio | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
| Vehicle Communication Interface Module (VCIM), w/UE1 | Keyword 2000 | Scan Tool Does Not Communicate with Keyword Data Line |
Data Link References