Reference Information
Schematic Reference
Data Communication Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Scan Tool Reference
- «Scan Tool Output Controls»(ref-267902-S03474750132007101700000)
- «Scan Tool Data List»(ref-267902-S12100446312007101700000)
- «Scan Tool Data Definitions»(ref-267902-S11088951732007101700000)
Circuit/System Verification
Verify that DTC B1000 is not set.
- If the DTC is set, perform the setup procedure on the control module. If the DTC resets replace the control module.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control module replacement, setup, and programming
Schematic Reference
Body Control System Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Body Control System Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Scan Tool Reference
- «Scan Tool Output Controls»(ref-267902-S03474750132007101700000)
- «Scan Tool Data List»(ref-267902-S12100446312007101700000)
- «Scan Tool Data Definitions»(ref-267902-S11088951732007101700000)
Verify that DTC B1001 is not set.
- If the DTC is set, perform the Restrain ID relearn on the BCM. If the DTC resets replace the BCM.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control module replacement, setup, and programming
Schematic Reference
Data Communication Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Scan Tool Reference
- «Scan Tool Output Controls»(ref-267902-S03474750132007101700000)
- «Scan Tool Data List»(ref-267902-S12100446312007101700000)
- «Scan Tool Data Definitions»(ref-267902-S11088951732007101700000)
Verify that DTC B1004 is not set.
- If the DTC is set, perform the setup procedure on the applicable control module, if the DTC resets replace the module.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control module replacement, setup, and programming
Schematic Reference
Data Communication Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Scan Tool Reference
- «Scan Tool Output Controls»(ref-267902-S03474750132007101700000)
- «Scan Tool Data List»(ref-267902-S12100446312007101700000)
- «Scan Tool Data Definitions»(ref-267902-S11088951732007101700000)
Verify that DTC B1009 is not set.
- If the DTC is set, perform the Restrain ID relearn on the control module. If the DTC resets, replace the applicable control module.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control module replacement, setup, and programming
Schematic Reference
Data Communication Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Scan Tool Reference
- «Scan Tool Output Controls»(ref-267902-S03474750132007101700000)
- «Scan Tool Data List»(ref-267902-S12100446312007101700000)
- «Scan Tool Data Definitions»(ref-267902-S11088951732007101700000)
Verify that DTC C0550 is not set.
- If the DTC is set, perform the learn procedure on the control module. If the DTC resets, replace the applicable control module.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control module replacement, setup, and programming
Action Taken When the DTCs Sets
- The module suspends all message transmission.
- The module uses default values for all parameters received on the serial data circuits.
- The module inhibits the setting of all other communication DTCs.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .
Schematic Reference
Data Communication Schematics
Connector End View Reference
Data Communication Connector End Views
Description and Operation
Data Link Communications Description and Operation
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
- Ignition OFF, test for less than 1 ohm of resistance between terminal 4 at the data link connector (DLC) and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition OFF, test for less than 1 ohm of resistance between the DLC terminal 5 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition ON, test for B+ between the DLC terminals 16 and ground. If not the specified value, test the B+ circuit for a short to ground or an open/high resistance.
- If all circuits test normal, refer to the scan tool user guide.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Schematic Reference
Data Communication Schematics
Connector End View Reference
Master Electrical Component List
Electrical Information Reference
- «Circuit Testing»(ref-267924-S30300380662007101700000)
- «Connector Repairs»(ref-267924-S40546396332007101700000)
- «Testing for Intermittent Conditions and Poor Connections»(ref-267924-S30568029692007101700000)
- «Wiring Repairs»(ref-267924-S21063363232007101700000)
Perform the Diagnostic Repair Verification after completing the repair.
- «Control Module References»(ref-267925-S30181830442007101700000) for module replacement, setup, and programming
- «GMLAN Wiring Repairs»(ref-267924-S34312487762007101700000)
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: LINK | ||
| Body Control Module (BCM) | High Speed GMLAN Low Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device and Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Digital Radio Receiver (DRR) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Electronic Brake Control Module (EBCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| HVAC Control Module | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Instrument Panel Cluster (IPC) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Inflatable Restraint Sensing and Diagnostic Module (SDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Power Steering Control Module (PSCM) | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Powertrain Control Module (PCM) Manual Transmission Only | High Speed GMLAN | Scan Tool Does Not Communicate with High Speed GMLAN Device |
| Radio | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Remote Playback Device - CD Player (CDX) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Theft Deterrent Module (TDM) | Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
| Vehicle Communication Interface Module (VCIM) | High Speed GMLAN - pass through only Low Speed GMLAN | Scan Tool Does Not Communicate with Low Speed GMLAN Device |
Data Link References
Scheme 15
| Callout | Component Name |
|---|---|
| 1 | Data Link Connector Screws (Qty: 2) NOTE: Refer to Fastener Notice . Tighten: 2 N.m (18 lb in) |
| 2 | Data Link Connector Tip: Transfer the wiring to the new connector. |
| NOTE |
|---|
| Refer to Fastener Notice . |
Data Link Connector Replacement
Scheme 16
| Callout | Component Name |
|---|---|
| Preliminary Procedure: Remove the front floor panel carpet filler. Refer to Front Floor Panel Carpet Filler Replacement . | |
| 1 | Body Control Module Bolts (Qty: 3) NOTE: Refer to Fastener Notice . |
| 2 | Body Control Module Tips Disconnect the electrical connectors. Program the body control module after replacement. Refer to Control Module References . |
| NOTE |
|---|
| Refer to Fastener Notice . |
Body Control Module Replacement
Power Mode Master
This vehicles body control module (BCM) functions as the power mode master (PMM). Refer to Power Mode Description and Operation for a complete description of power mode functions.
Serial Data Gateway
The body control module (BCM) in this vehicle functions as a translator between the High and Low speed GMLAN busses. The 2 communication protocols use the BCM to translate communicated serial data messages between the control modules over the 2 serial data busses.
Body Control Module
The various body control module (BCM) input and output circuits are described in the corresponding functional areas indicated on the BCM electrical schematics. The BCM functions include the following
- A/C compressor request. Refer to «Air Temperature Description and Operation»(ref-267932-S21241005862007101700000) .
- A/C cooling fan. Refer to «Air Delivery Description and Operation»(ref-267932-S00175835972007101700000) .
- Battery rundown protection (inadvertent power). Refer to «Interior Lighting Systems Description and Operation»(ref-267908-S29201282532007101700000) .
- Bulb check. Refer to «Instrument Cluster Description and Operation»(ref-267931-S36649725362007101700000) .
- Chimes. Refer to «Indicator/Warning Message Description and Operation»(ref-267931-S14738090192007101700000) . Check gages Door ajar warning Headlamps ON Key-in-ignition Oil reset Park brake warning Seat belt not fastened Turn signal ON
- Door lock interface. Refer to 12311.
- Electronic power steering (EPS). Refer to «Power Steering System Description and Operation»(ref-267941-S24183502062007101700000) .
- Engine coolant level sensing. Refer to «Cooling System Description and Operation»(ref-267956-S15789132492007101700000) .
- Exterior and interior lighting control. Refer to «Exterior Lighting Systems Description and Operation»(ref-267908-S33556043392007101700000) . Automatic lighting control Daytime running lamps (DRL) Fog lamps Park brake lights Turn hazard lamps
- Gage control. Refer to «Instrument Cluster Description and Operation»(ref-267931-S36649725362007101700000) .
- Horn interface. Refer to «Horns System Description and Operation»(ref-267928-S10932854372007101700000) .
- Instrument cluster indicator control. Refer to «Instrument Cluster Description and Operation»(ref-267931-S36649725362007101700000) .
- Interior lighting. Refer to «Interior Lighting Systems Description and Operation»(ref-267908-S29201282532007101700000) .
- Key-in-ignition sensing. Refer to «Indicator/Warning Message Description and Operation»(ref-267931-S14738090192007101700000) .
- Parking brake state sensing. Refer to «Brake Warning System Description and Operation»(ref-267934-S00134691252007101700000) .
- Retained accessory power (RAP). Refer to «Retained Accessory Power (RAP) Description and Operation»(ref-267924-S16286179182007101700000) .
- Rear compartment interface. Refer to «Power Door Locks Description and Operation»(ref-267910-S36031116362007101700000) .
- Rear defogger. Refer to «Rear Window Defogger Description and Operation»(ref-267907-S31911924162007101700000) .
- Remote function control. Refer to «Keyless Entry System Description and Operation»(ref-267929-S42136774102007101700000) .
- Seat belt use sensing. Refer to «Seat Belt System Description and Operation»(ref-267962-S08561384472007101700000) .
- Content theft deterrent. Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-267946-S15234100232007101700000) .
- Washer solvent level sensing. Refer to «Wiper/Washer System Description and Operation»(ref-267926-S17430267812007101700000) .
- Wiper/washer. Refer to «Wiper/Washer System Description and Operation»(ref-267926-S17430267812007101700000) .
Data Link Connector (DLC)
The data link connector (DLC) is a standardized 16-cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following
- Pin 1 GMLAN low speed communications terminal
- Pin 4 Scan tool power ground terminal
- Pin 5 Common signal ground terminal
- Pin 6 High speed GMLAN serial data bus (+) terminal
- Pin 14 High speed GMLAN serial data bus (-) terminal
- Pin 16 Scan tool power, battery positive voltage terminal
Serial Data Reference
The scan tool communicates over the various busses on the vehicle. When a scan tool is installed on a vehicle, the scan tool will try to communicate with every module that could be optioned into the vehicle. If an option is not installed on the vehicle, the scan tool will display No Comm for that options control module. In order to avert misdiagnoses of No Communication with a specific module, refer to Data Link References for a list of modules, the busses they communicate with, and the RPO codes for a specific module.