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Data Communication System: Other Chevrolet HHR I

Communication Devices ~1880 words

Reference Information

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for Scan Tool Information

Circuit/System Verification

Verify that DTC B1000 is not set.

  1. 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

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for Scan Tool Information

  1. Verify DTC B1001 is not set. If the DTC is set, program the control module.
  2. With a scan tool, clear the DTCs.
  3. Ignition OFF, remove the scan tool, open and close the drivers door.
  4. Wait 60 seconds, then verify DTC B1001 is not set. If DTC B1001 is set, replace the 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

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for Scan Tool Information

Verify that DTC B1004 is not set.

  1. 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

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for scan tool information

Verify that DTC B1009 is not set.

  1. 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

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for Scan Tool Information

Verify that DTC C0550 is not set.

  1. 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

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for scan tool information

Action Taken When the DTCs Sets

  1. The module suspends all message transmission.
  2. The module uses default values for all parameters received on the serial data circuits.
  3. The module inhibits the setting of all other communication DTCs.

Conditions for Setting the DTCs

The class 2 serial data circuit is shorted high or low for approximately 3 seconds.

  1. «Data Communication Schematics»(ref-299572-S23178003922008092400000)
  2. «Control Module References»(ref-299597-S40606836452008092400000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

  1. «GMLAN Wiring Repairs»(ref-299596-S16071572402008092400000)
  2. «Control Module References»(ref-299597-S40606836452008092400000) for module replacement, setup, and programming

Symptoms - Computer/Integrating Systems

IMPORTANTThe following steps must be completed before using the symptom tables.
  1. Perform the «Diagnostic System Check - Vehicle»(ref-299594-S04632865592008092400000) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data links.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to: «Data Link Communications Description and Operation»(ref-299572-S18051004922008092400000) «Body Control System Description and Operation»(ref-299572-S23712880132008092400000)

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

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool References

Control Module References for scan tool information

  1. Ignition OFF, test for less than 5 ohm 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.
  2. Ignition OFF, test for less than 5 ohm between the DLC terminal 5 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
  3. 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.
  4. If all circuits test normal, refer to the scan tool user guide.

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Body Control System Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool Reference

Refer to Control Module References for scan tool information.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(ref-299597-S40606836452008092400000) for module replacement, setup, and programming
  2. «GMLAN Wiring Repairs»(ref-299596-S16071572402008092400000)

Schematic Reference

  1. «Data Communication Schematics»(ref-299572-S23178003922008092400000)
  2. «Control Module References»(ref-299597-S40606836452008092400000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(ref-299597-S40606836452008092400000) for module replacement, setup, and programming
  2. «GMLAN Wiring Repairs»(ref-299596-S16071572402008092400000)

Schematic Reference

Data Communication Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

  1. «Circuit Testing»(ref-299596-S40031980912008092400000)
  2. «Connector Repairs»(ref-299596-S11637586662008092400000)
  3. «Testing for Intermittent Conditions and Poor Connections»(ref-299596-S35075552982008092400000)
  4. «Wiring Repairs»(ref-299596-S38795053442008092400000)

Scan Tool Reference

Control Module References for scan tool information.

Perform the Diagnostic Repair Verification after completing the repair.

  1. «Control Module References»(ref-299597-S40606836452008092400000) for module replacement, setup, and programming
  2. «GMLAN Wiring Repairs»(ref-299596-S16071572402008092400000)

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 ModuleData Link TypeDiagnostic Procedure
Schematic Reference: Data Communication Schematics
Body Control Module (BCM)High Speed GMLAN Low Speed GMLANScan 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 GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Electronic Brake Control Module (EBCM)High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Engine Control Module (ECM) L61High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Instrument Panel Cluster (IPC)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Inflatable Restraint Sensing and Diagnostic Module (SDM)Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Power Steering Control Module (PSCM)High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Powertrain Control Module (PCM) LSJHigh Speed GMLAN Communications Buss. Class 2 for diagnostics and SPS Programming OnlyScan Tool Does Not Communicate with High Speed GMLAN Device for communications malfunctions or Scan Tool Does Not Communicate with Class 2 Device for SPS malfunctions
RadioLow Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device
Transmission Control Module (TCM) NM5High Speed GMLANScan Tool Does Not Communicate with High Speed GMLAN Device
Vehicle Communication Interface Module (VCIM)High Speed GMLAN - pass through only Low Speed GMLANScan Tool Does Not Communicate with Low Speed GMLAN Device

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.

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.

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

  1. A/C compressor request-Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-299603-S38160188752008092400000) for the manual system.
  2. A/C cooling fan-Refer to «Air Delivery Description and Operation»(ref-299575-S17436718552008092400000) for the manual system.
  3. Battery rundown protection (inadvertent power)-Refer to «Interior Lighting Systems Description and Operation»(ref-299583-S42456931522008092400000) .
  4. Bulb check-Refer to «Instrument Cluster Description and Operation»(ref-299574-S39681898592008092400000) .
  5. Chimes-Refer to «Indicator/Warning Message Description and Operation»(ref-299574-S35836017882008092400000) . Check gages Door ajar warning Headlamps ON Key-in-ignition Oil reset Park brake warning Seat belt not fastened Turn signal ON
  6. Door lock interface-Refer to «Power Door Locks Description and Operation»(ref-299580-S29701322872008092400000) .
  7. Electronic power steering (EPS)-Refer to «Power Steering System Description and Operation (non-turbo)»(ref-299591-S11557221252008092400000) or «Power Steering System Description and Operation (turbo)»(ref-299591-S03016006862008092400000) .
  8. Engine coolant level sensing-Refer to «Cooling System Description and Operation»(ref-299633-S15296331422008092400000) .
  9. Exterior and interior lighting control-Refer to «Exterior Lighting Systems Description and Operation»(ref-299583-S16558372202008092400000) . Automatic lighting control Daytime running lamps (DRL) Fog lamps Park brake lights Turn hazard lamps
  10. Gage control-Refer to «Instrument Cluster Description and Operation»(ref-299574-S39681898592008092400000) .
  11. Horn interface-Refer to «Horns System Description and Operation»(ref-299601-S25150808612008092400000) .
  12. Instrument cluster indicator control-Refer to «Instrument Cluster Description and Operation»(ref-299574-S39681898592008092400000) .
  13. Interior lighting-Refer to «Interior Lighting Systems Description and Operation»(ref-299583-S42456931522008092400000) .
  14. Key-in-ignition sensing-Refer to «Indicator/Warning Message Description and Operation»(ref-299574-S35836017882008092400000) .
  15. Parking brake state sensing-Refer to «Brake Warning System Description and Operation»(ref-299577-S40125819852008092400000) .
  16. Retained accessory power (RAP)-Refer to «Retained Accessory Power (RAP) Description and Operation»(ref-299598-S31733793472008092400000) .
  17. Rear compartment interface-Refer to «Power Door Locks Description and Operation»(ref-299580-S29701322872008092400000) .
  18. Rear defogger-Refer to «Rear Window Defogger Description and Operation»(ref-299579-S08865459682008092400000) .
  19. Remote function control-Refer to «Keyless Entry System Description and Operation (without SPO Accy 2 Way Remote)»(ref-299602-S03053825902008092400000) or «Keyless Entry System Description and Operation (with SPO Accy 2 Way Remote)»(ref-299602-S29003660752008092400000) .
  20. Seat belt use sensing-Refer to «Seat Belt System Description and Operation»(ref-299569-S16996846792008092400000) .
  21. Content theft deterrent-Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-299603-S38160188752008092400000) .
  22. Vehicle theft deterrent-Refer to «Content Theft Deterrent (CTD) Description and Operation»(ref-299603-S38160188752008092400000) .
  23. Washer solvent level sensing-Refer to «Wiper/Washer System Description and Operation (Front)»(ref-299563-S08661442592008092400000) .
  24. Wiper/washer-Refer to «Wiper/Washer System Description and Operation (Front)»(ref-299563-S08661442592008092400000) .

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

  1. Pin 1 GMLAN low speed communications terminal
  2. Pin 2 Class 2 signal terminal
  3. Pin 4 Scan tool power ground terminal
  4. Pin 5 Common signal ground terminal
  5. Pin 6 High speed GMLAN serial data bus (+) terminal
  6. Pin 14 High speed GMLAN serial data bus (-) terminal
  7. Pin 16 Scan tool power, battery positive voltage terminal

Class 2 Serial Data Usage

The class 2 serial data communications circuit on this vehicle is only used for powertrain control module (PCM) diagnostics and PCM service programming system (SPS) programming.

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.

More articles — Data Communication System