Data Communication System: Other Saturn Outlook I

Circuit/System Verification

If this DTC is retrieved as a current DTC, replace the module that set the DTC.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, setup, and programming

1. Program or configure the module or related module that set DTC B1001. The module should successfully configure. If the module will not configure, replace the module that set the DTC.
2. With a scan tool, clear the DTC.
3. Ignition OFF, remove the scan tool, open and close the drivers door.
4. Wait 60 seconds, then recheck for DTCs. DTC B1001 should not set. If DTC B1001 sets, replace the module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, setup, and programming

1. Program the VIN information to the body control module (BCM).
2. Turn the ignition OFF, wait several seconds and then turn the ignition ON.
3. Retrieve DTCs from the BCM. DTC B1016 should change to a history DTC. If this DTC is retrieved as a current DTC, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for BCM replacement, setup, and programming

1. With a scan tool, clear DTC C0550. The DTC should clear. If the DTC will not clear, replace the control module.
2. Ignition OFF, remove the scan tool, open and close the drivers door.
3. Wait 60 seconds, ignition ON, then recheck for DTCs. DTC C0550 should not set. If DTC C0550 sets, replace the 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 uses a default value for the missing parameter.

Diagnosis of this DTC is accomplished via the symptom, Scan Tool Does Not Communicate with Low Speed GMLAN Device .

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.

1. Refer to «Data Link References»(ref-301188-S18039195422008101700000) to determine which serial data system is used for a specific module.
2. This DTC cannot be retrieved with a current status. Diagnosis is accomplished using the symptom «Scan Tool Does Not Communicate with High Speed GMLAN Device»(ref-301188-S07988271902008101700000) or «Scan Tool Does Not Communicate with Low Speed GMLAN Device»(ref-301188-S33568136332008101700000) .

Reference Information

Schematic Reference

1. «Data Communication Schematics»(ref-301188-S29802656272008101700000)
2. «Control Module References»(ref-301171-S28674306632008101700000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «GMLAN Wiring Repairs»(ref-301170-S29280999992008101700000)
2. «Control Module References»(ref-301171-S28674306632008101700000) for module replacement, setup, and programming

Schematic Reference

1. «Body Control System Schematics»(ref-301188-S42132685322008101700000)
2. «Data Communication Schematics»(ref-301188-S29802656272008101700000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming

Schematic Reference

1. «Body Control System Schematics»(ref-301188-S42132685322008101700000)
2. «Data Communication Schematics»(ref-301188-S29802656272008101700000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming.

Schematic Reference

1. «Data Communication Schematics»(ref-301188-S29802656272008101700000)
2. «Antilock Brake System Schematics»(ref-301182-S30658846902008101700000)
3. «Control Module References»(ref-301171-S28674306632008101700000)

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «GMLAN Wiring Repairs»(ref-301170-S29280999992008101700000)
2. «Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement»(ref-301182-S16313811662008101700000)
3. «Control Module References»(ref-301171-S28674306632008101700000) for module replacement, setup, and programming.

Symptoms - Data Communications

1. Perform the «Diagnostic System Check - Vehicle»(ref-301168-S23293457462008101700000) 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-301188-S04523334262008101700000) .

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-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Schematic Reference

1. «Data Communication Schematics»(ref-301188-S29802656272008101700000)
2. «Control Module References»(ref-301171-S28674306632008101700000)

Connector End View Reference

Component Connector End Views

Description and Operation

Data Link Communications Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-301170-S38040012632008101700000)
2. «Connector Repairs»(ref-301170-S29683795932008101700000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
4. «Wiring Repairs»(ref-301170-S19900861992008101700000)

Scan Tool Reference

Control Module References for scan tool information

Perform the Diagnostic Repair Verification after completing the repair.

1. «Control Module References»(ref-301171-S28674306632008101700000) for module replacement, setup, and programming
2. «GMLAN Wiring Repairs»(ref-301170-S29280999992008101700000)

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-301170-S38040012632008101700000)
2. «Testing for Intermittent Conditions and Poor Connections»(ref-301170-S40765135522008101700000)
3. «Wiring Repairs»(ref-301170-S19900861992008101700000)
4. «Connector Repairs»(ref-301170-S29683795932008101700000)

Perform the Diagnostic Repair Verification after completing the repair.

1. «Control Module References»(ref-301171-S28674306632008101700000) for module replacement, setup, and programming
2. «GMLAN Wiring Repairs»(ref-301170-S29280999992008101700000)

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 .

Scheme 8

Scheme 9

Scheme 10

Power Mode Master

This vehicles BCM functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.

Serial Data Gateway

The BCM in this vehicle functions as a gateway or translator. The purpose of the gateway is to translate serial data messages between the GMLAN high speed buss and the GMLAN low speed buss for communication between the various modules. The gateway will interact with each network according to that network's transmission protocol.

One example of this necessary communication is the communication between the engine/powertrain control module (ECM/PCM) which is high speed serial data and vehicle theft deterrent (VTD) control module which is low speed serial data. If these modules can not exchange information, the vehicle will not start.

Communication between the BCM and a scan tool can be on the high speed GMLAN network or low speed GMLAN network. If one network is lost, the BCM can still communicate with the scan tool. A lost communication DTC typically is set in modules other than the module with a communication failure.

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. Some BCM functions with the subsystems may be as a gateway only or as an enable for the system. The BCM related systems/subsystems include, but are not limited to the following

1. Antilock brake system (ABS)-Refer to «ABS Description and Operation»(ref-301182-S16805206172008101700000) .
2. Automatic day-night mirror-Refer to «Automatic Day-Night Mirror Description and Operation»(ref-301152-S19172853072008101700000) .
3. Electrical power management (EPM)-Refer to «Electrical Power Management Description and Operation»(ref-301154-S40599235002008101700000) .
4. Exterior lighting-Refer to «Exterior Lighting Systems Description and Operation»(ref-301136-S35518690572008101700000) .
5. Horn system-Refer to «Horns System Description and Operation»(ref-301174-S39040463432008101700000) .
6. Instrument cluster indicator control-Refer to «Instrument Cluster Description and Operation»(ref-301146-S28921275102008101700000) .
7. Interior lighting-Refer to «Interior Lighting Systems Description and Operation»(ref-301136-S27598268652008101700000) .
8. Power door lock system-Refer to «Power Door Locks Description and Operation (AXA)»(ref-301149-S03025887492008101700000) or «Power Door Locks Description and Operation (AXC/AXE)»(ref-301149-S30981994702008101700000) .
9. Rear window defogger system-Refer to «Rear Window Defogger Description and Operation»(ref-301131-S26758819532008101700000) .
10. Redundant steering wheel controls-Refer to «Steering Wheel Controls Description and Operation»(ref-301180-S22067537132008101700000) .
11. Remote function actuation (RFA) control-Refer to «Keyless Entry System Description and Operation»(ref-301175-S16031601762008101700000) .
12. Retained accessory power (RAP)-Refer to «Retained Accessory Power (RAP) Description and Operation»(ref-301172-S11084569882008101700000) .
13. Shift lock control system-Refer to «Automatic Transmission Shift Lock Control Description and Operation»(ref-301198-S02588998152008101700000) .
14. Starting system-Refer to «Starting System Description and Operation»(ref-301154-S13734158372008101700000) .
15. Supplemental inflatable restraint (SIR) system-Refer to «SIR System Description and Operation»(ref-301143-S35622915132008101700000) .
16. Theft deterrent-Refer to «Immobilizer Description and Operation»(ref-301192-S15857074682008101700000) and «Content Theft Deterrent (CTD) Description and Operation»(ref-301176-S17641715882008101700000) .
17. Wiper/Washer system functions-Refer to «Wiper/Washer System Description and Operation (Wiper and Washers)»(ref-301132-S18644536242008101700000) or «Wiper/Washer System Description and Operation (Heated Washer System)»(ref-301132-S23523901402008101700000) .

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 4 Scan tool power ground terminal
3. Pin 5 Common signal ground terminal
4. Pin 6 High speed GMLAN serial data bus (+) terminal
5. Pin 7
6. Pin 14 High speed GMLAN serial data bus (-) terminal
7. 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.