Cellular Communication System Buick LeSabre VIII

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

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DIAGNOSTIC STARTING POINT - CELLULAR COMMUNICATION

Begin the system diagnosis with DIAGNOSTIC SYSTEM CHECK - CELLULAR COMMUNICATION . The Diagnostic System Check will provide the following information

1. The identification of the control module(s) which command the system.
2. The ability of the control module(s) to communicate through the serial data circuit.
3. The identification of any stored Diagnostic Trouble Codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Test Description

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

1. 2 Lack of communication may be due to a partial malfunction or a total malfunction of the class 2 serial data circuit. The specified procedure will determine the condition.
2. 4 This step will determine which version of OnStar® is installed on the vehicle and which set of diagnostic procedures should be used.
3. 5 The presence of DTCs which begin with "U" indicate some other system control module is not communicating.

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SCAN TOOL DATA DEFINITIONS (F1)

1. Module Information - Software Version This displays the 3-digit number of the software version used on the OnStar® VCIM.
2. Module Information Hardware Version This displays the 1-digit number of the hardware version used on the OnStar® VCIM.
3. Module Information - Julian Date Of Build This displays the day of the year the module was built.
4. Module Information - Year Module Built This displays the year the module was built.
5. Module Information - 8-Digit GM Part Number This displays the part number for the VCIM.
6. Module Information - Component Serial #8 This is the first partition of the serial number.
7. Module Information - Component Serial #12 This is the second partition of the serial number.
8. Module Information - Component Serial #13 This is the third partition of the serial number.
9. VCI Module Station Identification Number (STID) This is the station identification number stored in the VCIM which is used by the OnStar® Call Center.
10. Module ID This displays the version of OnStar® which the vehicle is equipped with.
11. Electronic Serial Number (ESN) This is the electronic serial number stored in the VCIM which is used by the OnStar® Call Center.

SCAN TOOL DATA DEFINITIONS (2.6)

1. GPS Information - Second Gives second of current time as transmitted by GPS satellites.
2. GPS Information - Minute Gives current minute as transmitted by GPS satellites.
3. GPS Information - Hour Gives hour of current time as transmitted by GPS satellites.
4. GPS Information - Day Gives current day as transmitted by GPS satellites.
5. GPS Information - Month Gives current month as transmitted by GPS satellites.
6. GPS Information - Year Gives current year as transmitted by GPS satellites.
7. GPS Information - Latitude Gives current position (N/S) in degrees as calculated from GPS satellite information.
8. GPS Information - Longitude Gives current position (E/W) in degrees as calculated from GPS satellite information.
9. Module Information - Component Serial #8-11 This is the first partition of the serial number.
10. Module Information - Component Serial #12 This is the second partition of the serial number.
11. Module Information - Component Serial #13-16 This is the third partition of the serial number.
12. Module Information - Component Serial # 17-18 This is the last partition of the serial number.
13. Module Information - 3 Watt Transmitter ID This displays the part number for the transmitter.
14. Module Information - 8-Digit GM Part Number This displays the part number for the VIU.
15. Module Information - Julian Date Of Build This displays the day of the year the module was built.
16. Module Information - Master Flash ROM ID This displays the calibration or program revision level used in the Master ROM.
17. Module Information - PROM ID This displays the 4-digit number of the PROM incorporated into the Driver Door Module (DDM).
18. Module Information - Year Module Built This displays the 4-digit year of build.
19. Module Information 3 - Electronic Serial Number This displays the 6-8 digit numeric order in which the module was built.
20. Module Information 2 - VIU Station ID This displays an alpha-numeric ID of the VIU manufacturing station.
21. Module Information 2 - Module ID This displays the version of OnStar® which the vehicle is equipped with.
22. Slave Flash ROM ID This displays the calibration or program revision level used in the Slave ROM.

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Circuit Description

The Vehicle Communication Interface Module detects that the Cellular Microphone is connected through the Cellular Microphone Signal circuit and the drain wire.

Conditions For Setting DTC

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. All the above conditions are present for greater than 10 seconds.

Action Taken When DTC Sets

1. The Vehicle Communication Interface Module will not receive any signal from the microphone.
2. Calls can be placed but the caller cannot be heard.
3. The OnStar® status LED turns RED.

Conditions For Clearing DTC

1. The Vehicle Communication Interface Module detects the microphone connected for 5 consecutive 100 millisecond cycles.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The Vehicle Communication Interface Module receives the clear DTC command from the scan tool.

The number below refers to the step number on the diagnostic table.

1. 2 This step checks that the Vehicle Communication Interface Module is sending out the proper supply voltage.

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The navigation antenna is connected to the Vehicle Interface Unit (VIU) with a RG-174 coax cable. The VIU polls the data from the navigation antenna every 2.5 seconds.

Conditions For Running DTC

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. All the above conditions are present for greater than 2.5 seconds.

1. The VIU does not detect a GPS signal.
2. All the above conditions are present for greater than 2.5 seconds.

1. The OnStar® status LED turns RED.
2. The OnStar® Call Center cannot locate the vehicle.

1. The VIU detects the presence of a navigation antenna.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The VIU receives the clear DTC command from the scan tool.

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

1. 2 This step tests for proper ground on the navigation antenna.
2. 3 This step tests the condition of the navigation antenna.

Scheme 19

The Cellular Antenna is connected to the Vehicle Communication Interface Module with a RG-58 coax cable. The Vehicle Communication Interface Module polls the data from the cellular antenna once every second.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. All the above conditions are present for greater than 1 second.

1. The Vehicle Communication Interface Module does not detect a cellular signal.
2. All the above conditions are present for greater than 1 second.

1. The OnStar® status LED turns RED.
2. The vehicle is unable to connect to the OnStar® Call Center.

1. The Vehicle Communication Interface Module detects the presence of a Cellular Antenna.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The Vehicle Communication Interface Module receives the clear DTC command from the scan tool.

The number(s) below refer to the step number(s) on the diagnostic table.

1. 2 This step tests the condition of the Cellular Antenna.
2. 3 This step tests the condition of the cellular antenna coax and for proper ground of the cellular antenna.

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The OnStar® button assembly consists of three buttons, Call/Answer, OnStar® Call Center and OnStar® Emergency. Ten volts is supplied to the button assembly on the Keypad Supply Voltage circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a specific voltage to be returned to the Vehicle Communication Interface Module on the Keypad Signal circuit. Depending upon the voltage range returned, the Vehicle Communication Interface Module is able to identify which button has been pressed.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. The Keypad Signal circuit voltage to the Vehicle Communication Interface Module is less than 2.8 volts or more than 3.2 volts.
4. All the above conditions are present for greater than 300 ms.

1. The Vehicle Communication Interface Module will ignore all inputs from the OnStar® button assembly.
2. No calls can be placed.
3. The OnStar® status LED turns RED.

1. The Keypad Signal circuit voltage is between 2.8 volts and 3.2 volts.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The Vehicle Communication Interface Module receives the clear DTC command from the scan tool.

The number below refers to the step number on the diagnostic table.

1. 2 This step checks that the Vehicle Communication Interface Module is sending out the proper supply voltage.

Scheme 21

The OnStar® button assembly consists of three buttons, Call/Answer, OnStar® Call Center and OnStar® Emergency. Ten volts is supplied to the button assembly on the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a specific voltage to be returned to the Vehicle Interface Unit (VIU) on the keypad low reference circuit. Depending the voltage range returned, the VIU is able to identify which button has been pressed.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. The keypad low reference circuit voltage to the VIU is less than 2.8 volts or more than 3.2 volts.
4. All the above conditions are present for greater than 300 ms.

1. The VIU will ignore all inputs from the OnStar® button assembly.
2. No calls can be placed.
3. The OnStar® status LED turns RED.

1. The keypad low reference circuit voltage is between 2.8 volts and 3.2 volts.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The VIU receives the clear DTC command from the scan tool.

The number below refers to the step number on the diagnostic table.

1. 2 This step checks that the VIU is sending out the proper supply voltage.

Scheme 22

The OnStar® button assembly consists of three buttons, Call/Answer, OnStar® Call Center and OnStar® Emergency. Ten volts is supplied to the button assembly on the Keypad Supply Voltage circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a specific voltage to be returned to the Vehicle Communication Interface Module on the keypad signal circuit. Depending upon the voltage range returned, the Vehicle Communication Interface Module is able to identify which button has been pressed.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. A button is depressed or stuck for more than 15 seconds.
4. The Vehicle Communication Interface Module runs this test every 300 ms.

1. The Communication Interface Module will ignore all inputs from the OnStar® button assembly.
2. No calls can be placed.
3. The OnStar® status LED turns RED.

1. The button will be declared unstuck after a 50 ms normal cycle.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The Communication Interface Module receives the clear DTC command from the scan tool.

The number below refers to the step number on the diagnostic table.

1. 2 This step tests the at rest state of the Keypad Signal circuit.

Scheme 23

The Navigation Antenna is connected to the Vehicle Communication Interface Module with a RG-174 coax cable. The Vehicle Communication Interface Module polls the data from the Navigation antenna once every second.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. All the above conditions are present for greater than 1 second.

1. The Vehicle Communication Interface Module does not detect a Navigation signal.
2. All the above conditions are present for greater than 1 second.

1. The OnStar® status LED turns RED.
2. The OnStar® Call Center cannot locate the vehicle.

1. The Vehicle Communication Interface Module detects the presence of a Navigation antenna.
2. A history DTC clears after 50 malfunction free ignition cycles.
3. The Vehicle Communication Interface Module receives the clear DTC command from the scan tool.

The number below refers to the step number on the diagnostic table.

1. 2 This step tests the condition of the Navigation Antenna

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The Vehicle Communication Unit (VCU) and the Vehicle Interface Unit (VIU) communicate using the OnStar® Serial Data (-) circuit, OnStar® Serial Data (+) circuit and the OnStar Serial Data Return circuit. The DTC U1500 is set when the VIU detects no communication between the VIU and the VCU.

1. The ignition must be in the RUN or ACC position.
2. The system voltage is at least 9.5 volts and no more than 15.5 volts.
3. All the above conditions are present for greater than 300 ms.

1. The VIU does not communicate with the VCU.
2. No calls can be placed.
3. The OnStar® status LED turns RED.

1. The VIU does not detect a open on the battery positive voltage circuit.
2. The VIU does not detect a short to ground on the serial data return circuit.
3. The VIU does not detect a short to B+ on serial data (-) circuit.
4. A history DTC clears after 50 malfunction free ignition cycles.
5. The VIU receives the clear DTC command from the scan tool.

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

1. 2 By disconnecting the VCU you can check the three wire bus supply and carrier voltages supplied by the VIU.
2. 3 By disconnecting the VCU you can check the three wire bus supply and carrier voltages supplied by the VIU.

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SYMPTOMS - CELLULAR COMMUNICATION (F1)

Note. The following steps must be completed before using the symptom tables.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - CELLULAR COMMUNICATION»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control module can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «ONSTAR DESCRIPTION & OPERATION»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system__onstar-description-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ONSTAR ONE OR MORE BUTTONS INOPERATIVE (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «ONSTAR ONE OR MORE BUTTONS INOPERATIVE (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
2. «UNABLE TO CONTACT ONSTAR CALL CENTER (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «UNABLE TO CONTACT ONSTAR CALL CENTER (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
3. «ONSTAR BUTTON LED INOPERATIVE (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «ONSTAR BUTTON LED INOPERATIVE (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
4. «NO (OR NOISY) ONSTAR AUDIO (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «NO (OR NOISY) ONSTAR AUDIO (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
5. «MICROPHONE INOPERATIVE - CALLER CANNOT BE HEARD (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «MICROPHONE INOPERATIVE - CALLER CANNOT BE HEARD (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
6. «VOICE RECOGNITION INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)

SYMPTOMS - CELLULAR COMMUNICATION (2.6)

Note. The following steps must be completed before using the symptom tables.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - CELLULAR COMMUNICATION»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to «ONSTAR DESCRIPTION & OPERATION»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system__onstar-description-operation) .

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ONSTAR ONE OR MORE BUTTONS INOPERATIVE (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «ONSTAR ONE OR MORE BUTTONS INOPERATIVE (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
2. «UNABLE TO CONTACT ONSTAR CALL CENTER (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «UNABLE TO CONTACT ONSTAR CALL CENTER (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
3. «ONSTAR BUTTON LED INOPERATIVE (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «ONSTAR BUTTON LED INOPERATIVE (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
4. «NO (OR NOISY) ONSTAR AUDIO (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «NO (OR NOISY) ONSTAR AUDIO (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
5. «MICROPHONE INOPERATIVE - CALLER CANNOT BE HEARD (F1)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) or «MICROPHONE INOPERATIVE - CALLER CANNOT BE HEARD (2.6)»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)
6. «VOICE RECOGNITION INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system)

CHECKING AFTERMARKET ACCESSORIES

Do not connect aftermarket accessories into the following circuits

1. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
2. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

1. Power feeds connected to points other than the battery.
2. Antenna location.
3. Transceiver wiring located too close to vehicle electronic modules or wiring.
4. Poor shielding or poor connectors on antenna feed line.
5. Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

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

1. 2 This step determines if the Vehicle Communication Interface Module is connecting to the OnStar® Call Center. If any message other than "Unable to connect to OnStar" is played through the audio system, the problem is not within the vehicle and the supporting cellular system and/or carriers may be at fault.
2. 3 A bad cellular connection may cause the Vehicle Communication Interface Module to fail to connect to the OnStar® Call Center.

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

1. 2 Determines if the OnStar® status LED has the necessary Green LED signal circuit voltage.
2. 5 If the Green LED signal is shorted to voltage then the OnStar® three button assembly has been damaged and the OnStar® three button assembly must be replaced.

Scheme 38

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

1. 3 Determines if the OnStar® status LED has the necessary GRN LED signal circuit.
2. 5 If the GRN LED signal is shorted to voltage then the OnStar® three button assembly has been damaged. The OnStar® three button assembly has to be replaced.

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The number below refers to the step number on the diagnostic table.

1. 7 If the Cellular Telephone Voice Low Reference circuit is shorted to voltage the Vehicle Communication Interface Module has been damaged and requires replacement.

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OnStar® Module Reprogramming

Note. Follow the instruction set for the part that you are replacing. Failure to perform these steps will prevent the OnStar® features from functioning and will result in a customer return for repair.

Vehicle Interface Unit (VIU)

1. Record the STID number from the label on the new module (10 Digits).
2. After replacement, press the blue OnStar® button twice to connect to OnStar®. Tell the advisor that this vehicle has a new VIU and a new STID number to put in the customers account.
3. The OnStar® Advisor will reconfigure the vehicle with you. Once the advisor completes configuration, you can end the call. Follow any additional instructions given by the Advisor.
4. The old VIU must be returned for core credit with the address label included in the original box. Failure to return core will result in a debit.

Vehicle Communication Unit (VCU)

1. Record the ESN number from the label on the new part, (11 digits, no letters).
2. Install the new VCU.
3. After replacement, press and hold the OnStar "End Call" button (black with white dot); watch for the OnStar® status light change from Green to Red to Green.
4. Press the blue OnStar® button to connect to OnStar®. Tell the advisor that this vehicle has a new VCU and a new ESN to put in the customers account. Follow any additional instructions given by the Advisor.
5. The old VCU must be returned for core credit. Use the address label included in the original box. Failure to return core will result in a debit.

Removal Procedure

Note. The adhesion promoter must be used to assure adequate bonding of the coupling. To obtain maximum adhesion between the new mobile antenna coupling and the glass surface, the couplings and the glass must be kept dry and above 15°C (60°F) during the installation. Allow 6-8 hours, at 15°C (60°F), for the adhesive to cure after installation. Otherwise the new coupling may come not adhere. Do not use using any type of glue, adhesive tapes, etc. to reinstall the original couplings. Doing so may eliminate the cellular signal transfer through the glass and reduce the maximum performance of the system, including the air bag deployment notification.

1. Disconnect the coaxial cable from the inner coupling of the mobile communication antenna. CAUTION: If you use a razor blade or other sharp tool in order to remove the adhesives or foreign objects from the inside of the rear window, use the blade carefully. Damage to the grid lines may result.
2. Use a small wide-bladed plastic tool to cut the double back tape material while lifting up on the inner antenna coupling.

Installation Procedure

1. Clean the inside of the back glass with an alcohol wipe.
2. Dry the glass thoroughly using a lint free cloth. NOTE: The adhesion promoter must be used to assure adequate bonding of the coupling. Mask off or protect areas before applying the adhesion promoter.
3. Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the rear window in the area where you will install the antenna coupling. Follow the Glass Adhesion Promoter instructions on the product label. NOTE: The RF connections for the inner antenna coupling should run parallel to the defogger grid line. Align the inner and outer antenna couplings. Do not touch the adhesive backing on the antenna coupling.
4. Remove the protective film from the adhesive backing on the inner antenna coupling.
5. Align the inner antenna coupling to the 4 locating marks on the back glass above the defogger grid line, or to the existing exterior coupling.
6. Press firmly on all 4 corners and on the center of the antenna inner coupling (2) in order to ensure proper adhesion to the back glass (4). Hold pressure on the inner coupling (2) for 10-30 seconds.
7. Ensure that no gaps occur between the couplings (5, 2) and the back glass (4).
8. Connect the coaxial cable to the inner coupling (2).
9. Keep the vehicle dry. Allow 6-8 hours, at 15°C (60°F), for the adhesive to cure after installation.

Note. The adhesion promoter must be used to assure adequate bonding of the coupling. To obtain maximum adhesion between the new mobile antenna couplings and the glass surface, the adhesion promoter must be used and the couplings and the glass must be kept dry and above 15°C (60°F) during the installation. Allow 6-8 hours, at 15°C (60°F), for the adhesive to cure after installation, otherwise the new couplings may come off. Do not use using any type of glue, adhesive tapes, etc. to reinstall the original couplings. Doing so may eliminate the cellular signal transfer through the glass and reduce the maximum performance of the system, including the air bag deployment notification.

1. Install the inner coupling first if both the inner and the outer coupling are to be replaced. Refer to «COUPLING REPLACEMENT - ANTENNA INNER»(/buick/lesabre/viii-2000-2005/remont/entertainment-systems/#cellular-communication-system) . CAUTION: If you use a razor blade or other sharp tool in order to remove the adhesives or foreign objects from the inside of the rear window, use the blade carefully. Damage to the grid lines may result.
2. Use a small wide-bladed plastic tool to cut the double back tape material while lifting up on the outer antenna coupling.

1. Clean the back glass with an alcohol wipe.
2. Dry the glass thoroughly using a lint free cloth. NOTE: The adhesion promoter must be used to assure adequate bonding of the coupling. Mask off or protect areas before applying the adhesion promoter.
3. Apply Glass Adhesion Promoter GM P/N 12378555 (Canadian P/N 88901239) to the rear window in the area where you will install the antenna coupling. Follow the Glass Adhesion Promoter instructions on the product label. NOTE: Align the inner and outer antenna couplings. Do not touch the adhesive backing on the antenna coupling.
4. Remove the protective film from the adhesive backing on the outer antenna coupling.
5. Align the outer antenna coupling to the inner antenna coupling.
6. Press firmly on all 4 corners, and on the center of the antenna outer coupling (5) in order to ensure proper adhesion to the back glass (4). Hold pressure on the outer coupling (5) for 10-30 seconds.
7. Ensure that no gaps occur between the couplings (5, 2) and the back glass (4).
8. Keep the vehicle dry. Allow 6-8 hours, at 15°C (60°F), for the adhesive to cure after installation.

1. Remove the rear seat back. Refer to «SEAT BACK REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/seats/#power-seat-system) .
2. Remove the forward rear compartment trim. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
3. Remove the Global Positioning System (GPS) antenna module push-in fasteners (2).
4. Lower the GPS module (1) to the rear compartment floor.
5. Disconnect the GPS antenna coaxial cable connector from the Communication Interface Module.
6. Disengage the coaxial cable to the rear shelf carrier retainers.
7. Remove the GPS antenna from the rear shelf carrier.

1. Install the Global Positioning System (GPS) antenna coaxial cable into the retainers in the rear shelf carrier.
2. Close the cable retainers.
3. Secure the GPS antenna module (1) to the rear shelf carrier with the push-in fasteners (2). see scheme 49
4. Connect the GPS antenna coaxial cable connector to the Communication Interface Module.
5. Install the forward rear compartment trim. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end).
6. Install the rear seat back. Refer to «SEAT BACK REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/seats/#power-seat-system).

ONSTAR VEHICLE COMMUNICATION UNIT (VCU) REPLACEMENT

Note. Never swap OnStar® Vehicle Integration Units (VIU), or the Vehicle Communication Units (VCU) from other vehicles. Transfer of OnStar® components from other vehicles should NOT be done. Each OnStar® component has a unique identification number. The VIU has a 10-digit Specific Station Identification (STID) and the VCU has a 11-digit specific Electronic Serial Number (ESN). These identification numbers are used by the National Cellular Telephone Network and OnStar® systems, and are stored in the General Motors vehicle history files by VIN.

1. Open the rear compartment lid
2. Remove the forward rear compartment trim panel. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) .
3. Disconnect the cellular coaxial cable (2) from the OnStar® VCU by pulling upward on the spring loaded snap connector.
4. Disconnect the electrical connector.
5. Remove the VCU (6) by lifting the retainer tab (1).
6. Remove the VCU (6).
7. The old VCU must be returned for core credit.

Scheme 42

1. Record the 11-digit ESN from the label on the new VCU module.
2. Install the OnStar® VCU (6) into the module bracket assembly.
3. Connect the electrical connector.
4. Connect the cellular coaxial cable (2) to the VCU (6) until fully seated.
5. Ensure the locking tab (1) is secure to the VCU.
6. Install the forward rear compartment trim panel. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
7. Press and hold the "end call" button, which is a black button with a white dot. The OnStar® status light will change from green to red to green.
8. Contact the OnStar® Dealer support line by pressing the blue OnStar® button twice. The 11-digit ESN number will be needed by the OnStar® advisor.
9. Close the rear compartment lid.

ONSTAR VEHICLE INTERFACE UNIT (VIU) REPLACEMENT

Note. Never swap OnStar® Vehicle Integration Units (VIU), or the Vehicle Communication Units (VCU) from other vehicles. Transfer of OnStar® components from other vehicles should NOT be done. Each OnStar® component has a unique identification number. The VIU has a 10-digit Specific Station Identification (STID) and the VCU has a 11-digit specific Electronic Serial Number (ESN). These identification numbers are used by the National Cellular Telephone Network and OnStar® systems, and are stored in the General Motors vehicle history files by VIN.

1. Open the rear compartment lid.
2. Remove the forward rear compartment trim panel. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
3. Disconnect the OnStar® Global Positioning Satellite (GPS) antenna coaxial cable (4) from the OnStar® VIU (5).
4. Disconnect the 2 electrical connectors.
5. Remove the VIU (5) by lifting the retainer tabs (3) upward.
6. Remove the VIU (5) from the vehicle.
7. The old VIU must be returned for core credit.

Scheme 43

1. Record the 10-digit STID number from the label on the VIU module.
2. Install the OnStar® Vehicle Interface Unit (VIU) (5) into the module bracket assembly. CAUTION: In order to avoid damage to the circuit board, do NOT over-tighten the thumb screws. Using your fingers, apply only a light pressure.
3. Connect the 2 electrical connectors. Apply 0.2 N.m (2 lb in) of torque, or less, to the thumb screw electrical connectors.
4. Connect the OnStar® GPS antenna coaxial cable (4) to the VIU (5) until fully seated.
5. Ensure the locking tabs (3) are secure to the VIU.
6. Install the forward rear compartment trim panel. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
7. Contact the OnStar® Dealer Support line by pressing the OnStar® button twice. The 10-digit STID number recorded will be needed by the OnStar® Dealer Support line.
8. Close the rear compartment lid.

Note. Do not exchange the vehicle communication interface module with other vehicles. Each vehicle communication interface module has a Specific Station Identification (STID) and Electronic Serial Number (ESN). These identification numbers are stored in the General Motors vehicle history files by VIN and are used by OnStar® and the National Cellular Telephone Network.

1. Remove the rear compartment trim. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
2. Disconnect the antenna (2) and electrical connections (3) from the Vehicle Communication Interface Module (VCIM) (4).
3. Release the VCIM retaining tabs (1).
4. Slide the vehicle VCIM (4) out of the electrical component mounting bracket.

Scheme 44

1. When replacing the VCIM, record the 11-digit Electronic Serial Number (ESN) and the 10-digit Station Identification (STID) number from the label on the new VCIM (4).
2. Slide the VCIM (4) into the electrical component mounting bracket.
3. Push in on the top of the VCIM (4) until an audible click is heard, indicating the retaining tabs (1) have securely fastened the VCIM (4) to the electrical component mounting bracket.
4. Connect the antenna cable (2) and electrical connections (3) to the VCIM (4).
5. Install the rear compartment trim. Refer to «COMPARTMENT TRIM PANEL REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End. NOTE: Pressing and holding the white dot button on the keypad will not reset this version of the OnStar system. This action will cause a DTC to set.
6. If replacing the VCIM, perform the following: Install the scan tool. Use the special functions menu in order to perform the OnStar setup procedure for this vehicle. Move the vehicle to an open area that is away from tall buildings, and with a clear view of unobstructed sky. Allow the vehicle to run for 10 minutes. Use the ID Information, Module 2 screen of the scan tool in order to access the new station ID and electronic serial number from the new VCIM. Press the blue OnStar button twice to connect to OnStar. Tell the advisor that this vehicle has received a new VCIM. Ask the advisor to add the new STID and ESN to the customer's account. Follow any additional instructions from the OnStar advisor.

ONSTAR DESCRIPTION & OPERATION

The OnStar® system on this vehicle will be one of two systems, Generation 2.6 or Generation F1. Both systems use a navigation antenna, cellular antenna, cellular microphone and OnStar® button assembly. Each system also interfaces with the vehicle audio system. To determine which system this vehicle is equipped with, install a scan tool and access the Module 3, Module I.D. Information screen on the scan tool. The differences between the 2 systems are described in the following

1. The OnStar® Generation 2.6 interface with the vehicle operating system by means of 2 modules, the Vehicle Interface Unit (VIU) and the Vehicle Communications Unit (VCU). This system provides the customer with impact detection, navigation instructions, emergency services, stolen vehicle tracking and recovery service, roadside assistance, door lock and unlock, horn pulse, light flash, and remote diagnostics. In addition, a hands free cellular phone is available with the existing OnStar® components, as an optional feature to the customer.
2. The OnStar® Generation F1 interfaces with the vehicle operating system by means of a single module, the Vehicle Communication Interface Module (VCIM), and provides all the same features as the 2.6 system.

OnStar® Button Assembly

The OnStar® button assembly may be part of the rear view mirror on some vehicles and a separate unit on others. The button assembly is comprised of the 3 buttons and a status LED. The buttons are defined as follows

1. The Answer/End Call button, which is black with a white "dot", allows the user to answer and end calls or initiate the personal calling feature if equipped.
2. The OnStar® call center button which displays the OnStar® logo allows the user to connect to the OnStar® call center.
3. The red Emergency button sends a high priority emergency call to the OnStar® call center when pressed.

The OnStar® button assembly receives 10 volts on the keypad supply voltage circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a specific voltage to be returned to the VIU or VCIM on the keypad signal circuit. Depending upon the voltage range returned, the VIU or VCIM is able to identify which button has been pressed.

The OnStar® button assembly status LED is green when the system is ON and operating normally. When the status LED is green and flashing, it is an indication that a call is in progress. When the LED is red, this indicates a system malfunction is present. The OnStar® LED is controlled by the VIU or VCIM over the keypad red LED signal circuit and the keypad green LED signal circuit.

OnStar® Microphone

The OnStar® microphone can be part of the rear view mirror assembly or, on some vehicle lines, can be a separate unit. The users voice is transmitted from the microphone to the VIU or VCIM over the cellular microphone signal circuit.

The Vehicle Interface Unit for the OnStar® system contains a GPS receiver and a cellular modem. The GPS receiver determines the vehicle location using the GPS satellite system. The GPS signal receiving antenna, or navigation antenna, plugs directly into the VIU and requires a clear and unobstructed path to the satellites in the sky. Window tinting applied to vehicle glass may interfere with the navigation antenna functions depending upon the amount of darkening and/or metallic particles which are embedded in the darkening film of the tinting material. The VIU communicates with the rest of the vehicle over the class 2 serial data bus. Power is supplied to the VIU from the battery positive voltage circuit and power moding is achieved by means of class 2 messaging. Class 2 is also used for features such as impact detection, door lock and unlock, horn pulse, light flash, audio mute, and remote diagnostics. After the audio system has muted, the OnStar® audio is transmitted to the vehicle audio system on the remote audio output (-), remote audio right signal circuit, and the remote audio left signal circuit.

The Vehicle Communication Unit is a 3-watt transceiver that connects the OnStar® system to the cellular carriers communication system. The cellular antenna plugs directly into the VCU while power and ground is provided by the Vehicle Interface Unit (VIU). Communication between the VIU and VCU is accomplished via the OnStar® serial data (-) circuit, OnStar serial data (+) circuit, and the serial data return circuit. The callers voice is carried to the VCU using the microphone signal circuit and the drain wire circuit. The audio signal is carried from the VCU to the VIU on the audio return signal circuit and the audio low reference circuit.

Vehicle Communication Interface Module (VCIM)

The Vehicle Communication Interface Module for the OnStar® system contains a GPS receiver and a cellular modem. The GPS receiver determines the vehicle location using the GPS satellite system. The GPS or, navigation antenna, which receives the GPS signal plugs directly into the VCIM. The navigation antenna requires a clear and unobstructed path to the satellites in the sky. Window tinting on vehicles may interfere with the GPS sensor functions, depending upon the amount of darkening and/or metallic particles which are embedded in the film of the tinting material. The Vehicle Communication Interface Module communicates with the rest of the vehicle over the class 2 serial data bus. On vehicles that do not use class 2 to communicate with the audio system, the VCIM uses the entertainment and comfort serial data circuit. The module is powered from the battery positive voltage circuit, and power moding is accomplished by class 2 messaging. The module also has the capability of commanding the horn, door lock/unlock and operating the exterior lamps using the class 2 serial data circuit. To mute the audio system, the Vehicle Communication Interface Module uses either the class 2 serial data circuit or the entertainment and comfort serial data circuit. After the audio system is muted, the OnStar® audio is transmitted to the vehicle audio system on the remote audio output (-), remote audio right signal circuit, and the remote audio left signal circuit. The VCIM is a 3-watt transceiver that connects the OnStar® system to the cellular carrier's communication system. The module handles all cellular communications over the cellular antenna and cellular antenna coax, which plugs directly into the module.

Operation Of Hands Free Cellular Phone

The hands free, personal calling cellular phone feature is an additional option to the OnStar® system. During a hands free call, the microphone and audio system operate the same way as a standard OnStar® call. When the answer/end call button is pressed, the audio system will mute, the OnStar® system will then return the prompt "ready". At this point there are specific commands set to initiate a cellular call. If the vehicle receives a call when the radio is ON, the audio system will mute and an audible "ring" will be heard though the speakers. The call will be answered when the answer/end call button is pressed.

All the voice activated commands are interpreted by the Vehicle Interface Unit or Vehicle Communication Interface Module. A list of these commands is supplied in the information provided to the customer. If the information is not available to reference, at any command prompt the caller can say "HELP" and the VIU or VCIM will return an audible list of available commands. If the customer concern is not being understood or not being heard by the OnStar® system, the user should place a call to the OnStar® call center to verify proper operation of the microphone. Here is an example of the commands and the OnStar® system responses. A complete list of commands is supplied in the information provided to the customer with the OnStar® system.

Scheme 45

Operation of the OnStar® Speech Recognition Systems

OnStar® Gen 2.6 and F1 users communicate with two speech recognition systems. Speech recognition allows the user to speak to one computer in the vehicle, and one reached over a phone line. The computer tries to understand the user's command, and responds by speaking back, or by taking the appropriate action, e.g. dialing the phone.

1. Personal Calling uses a speech recognition system that resides in the vehicle. When the user presses the dot button, the system states, "Ready", and listens for the user's command. The user can speak commands to control the hands-free phone.
2. Virtual Advisor is a remote speech recognition system that the caller access by making a phone call. The user connects to Virtual Advisor by requesting it during personal calling use. The user is then transferred to the Virtual Advisor server and talks to it via a cellular connection.

The OnStar® speech recognition systems use speech technology that is designed to understand a wide range of American English speakers. Although there is no one "correct" way to speak English, the system will work best when users try to modify their pronunciation should they encounter difficulty. Users who do not obtain good results are advised to try the tips and "workarounds" found in this section.

Scheme 46

Scheme 47

See also:
• TESTING FOR INTERMITTENT AND POOR CONNECTIONS
• DISABLING SYSTEM
• SEAT BACK REPLACEMENT - REAR
• COMPARTMENT TRIM PANEL REPLACEMENT - REAR
• DIAGNOSTIC SYSTEM CHECK - CELLULAR COMMUNICATION
• ONSTAR DESCRIPTION & OPERATION
• CHECKING AFTERMARKET ACCESSORIES