Data Communication System: Overview Pontiac Solstice I

Scheme 1

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Scheme 4

Scheme 5

Scheme 6

Scheme 7

Callouts For (Scheme 7)

Scheme 8

Callouts For (Scheme 8)

Scheme 9

BCM C1 Connector Part Information

BCM C1 Connector Terminal Identification

Scheme 10

BCM C2 Connector Part Information

BCM C2 Connector Terminal Identification

Scheme 11

BCM C3 Connector Part Information

BCM C3 Connector Terminal Identification

Scheme 12

BCM C4 Connector Part Information

BCM C4 Connector Terminal Identification

Scheme 13

DLC Connector Part Information

DLC Connector Terminal Identification

Scheme 14

DLC Resistor Connector Part Information

DLC Resistor Connector Terminal Identification

Circuit/System Description

The control module runs a program to detect an internal fault when power up is commanded.

The body control module (BCM) stores the last 4 digits of the sensing and diagnostic module (SDM) part number, information also called restraints ID. After the BCM is reprogrammed, the restraint ID is set to zero, and a restraint ID relearn needs to be performed.

The internal fault detection is handled inside the control module.

The electrically erasable programmable read-only memory (EEPROM) check sum error detection is handled inside the control module.

When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an internal malfunction is detected, the control module will store a DTC C0550 in its memory.

Test Description

The numbers below refer to the step numbers on the diagnostic table

1. 3: If body control module (BCM) will not power up the vehicle cannot establish the correct power mode. This step tests for the correct power supply conditions for the BCM.
2. 4: If DTC U0020 is set as history and you can communicate with the suspect module, the malfunction is an intermittent communication buss, power supply, ground or internal module connection.
3. 5: This step tests for the correct power supply conditions of the suspect module or modules.
4. 6: This step identifies which of the GMLAN busses the module or modules use for communication. Use the «Data Link References»(ref-267902-S17711199882007101700000) for identifying the correct buss to analyze.
5. 11: The module which was not communicating due to an open in the GMLAN serial data circuits may have set Loss of Communication DTCs for those modules that it was monitoring.
6. 20: The modules which can communicate indicate the module which cannot communicate. You must clear the DTC from these modules to avoid future misdiagnosis.

DTC U0020

The numbers below refer to the step numbers on the diagnostic table

1. 3: If body control module (BCM) will not power up the vehicle cannot establish the correct power mode. This step tests for the correct power supply conditions for the BCM.
2. 4: If DTC U2103 is set as history and you can communicate with the suspect module, the malfunction is an intermittent communication buss, power supply, ground or internal module malfunction.
3. 5: This step tests for the correct power supply conditions of the suspect module or modules.
4. 6: This step identifies which of the GMLAN busses the module or modules use for communication. Use the «Data Link References»(ref-267902-S17711199882007101700000) for identifying the correct buss to analyze.
5. 11: The module which was not communicating due to an open in the GMLAN serial data circuits may have set Loss of Communication DTCs for those modules that it was monitoring.
6. 20: The modules which can communicate indicate the module which cannot communicate. You must clear the DTC from these modules to avoid future misdiagnosis.

DTC U2103

The numbers below refer to the step numbers on the diagnostic table

1. 3: Non ABS equipped vehicles may set a DTC U2108 falsely. If this is the case there is no malfunction with this system.
2. 5: If the body control module (BCM) will not power up, the vehicle cannot establish the correct power mode. This step test for the correct power supply conditions for the BCM.
3. 6: If DTC U2105 to U2177 are set as history and you can communicate with the suspect module, the malfunction is an intermittent communication buss, power supply, ground or internal module connection.
4. 7: This step tests for the correct power supply conditions of the suspect module or modules.
5. 8: This step identifies which of the GMLAN busses the module or modules use for communication. Use the «Data Link References»(ref-267902-S17711199882007101700000) for identifying the correct buss to analyze.
6. 13: The module which was not communicating due to an open in the GMLAN serial data circuits may have set Loss of Communication DTCs for those modules that it was monitoring.
7. 14: The modules which can communicate indicate the module which cannot communicate. You must clear the DTC from these modules to avoid future misdiagnosis.

DTC U2105-U2199

Symptoms - Computer/Integrating Systems

1. Perform the «Diagnostic System Check - Vehicle»(ref-267923-S26873286382007101700000) 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-267902-S28544433692007101700000) «Body Control System Description and Operation»(ref-267902-S20510370672007101700000)

The data link connector (DLC) is a standardized 16-cavity connector. Design and location is dictated by an industry-wide standard. The following is required to be provided

1. Scan tool power battery positive voltage at terminal 16
2. Scan tool power ground at terminal 4
3. Common signal ground at terminal 5

The scan tool will power up with the ignition OFF. Some modules, however, will not communicate unless the ignition is ON and the power mode master (PMM) module sends the appropriate power mode message.

The numbers below refer to the step numbers on the diagnostic table.

1. 2: A partial malfunction in the high speed GMLAN serial data circuits uses a different procedure from a total malfunction of the high speed GMLAN data circuits. Refer to «Data Link References»(ref-267902-S17711199882007101700000) to identify which modules communicate on the high speed GMLAN serial data circuits.
2. 3: The DTC U2100 may be retrieved with a history status, but is not the cause of the present condition.
3. 8: Data link connector terminals 6 and 14 provide the connection to the GMLAN serial data high circuit and the GMLAN serial data low circuit respectively.
4. 17: The communication malfunction may have prevented diagnosis of the customer complaint.

Scan Tool Does Not Communicate with High Speed GMLAN Device

Modules connected to the low speed GMLAN serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The low speed GMLAN serial data circuit uses SP 200 as a centralized common contact point for the buss.

Body Control System Description and Operation

This vehicle's body control module (BCM) has a bussed electrical center integrated into the housing. Body control relays and fuses are installed directly on the BCM, which simplifies wiring and junction blocks on the vehicle. The body control system consists of the BCM and its associated controls. Battery positive voltage is provided to the BCM from IBCM BATT 1 fuse and the IBCM BATT 2 fuse in the underhood fuse block. The module grounds are wired to ground G201, G203 and G305. The BCM is wired to the GMLAN High speed serial data buss, and the GMLAN Low speed serial data buss, as well as discrete input and output terminals to control the functions of the vehicle's body.