Hummer H2. Manual - part 216

 

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Hummer H2. Manual - part 216

 

 

ONSTAR CALL CENTER REMOTE FUNCTION REQUESTS INOPERATIVE 

Diagnostic Aids 

The customer concern may have been due to a lack of cellular service in a given area or a failure in the National 
Cellular Network infrastructure that has since been corrected. 

OnStar Call Center Remote Function Requests Inoperative 

10

Replace the Communication Interface Module. 
Refer to Communication Interface Module 
Replacement .Did you complete the replacement?

IMPORTANT:

Perform the OnStar(R) setup procedure.

-

Go to 

Step 11

-

11

Operate the system in order to verify the repair. 
Did you correct the condition?

-

System 

OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference:OnStar Schematics 
Connector End View Reference:Cellular Communication Connector End Views

1

Did you perform the Cellular 
Communication Diagnostic System 
Check?

Go to Step 2

Go to Diagnostic System Check - 
Cellular Communication

2

Attempt to honk the horn, operate the 
lights and lock or unlock the doors on the 
vehicle. 
Does the applicable system operate 
properly?

Go to Step 3

Go to 

z

Diagnostic Starting Point - 
Horns in Horns  

z

Diagnostic Starting Point - 
Lighting Systems in Lighting 
Systems  

z

Diagnostic Starting Point - 
Doors in Doors  

3

1. Contact the OnStar(R) Call Center 

by pressing the blue OnStar(R) 
button.  

2. Ask the OnStar(R) advisor to 

perform a remote function (door 
lock/unlock, light flash, or horn 
honk).  

IMPORTANT:

It is necessary to inform the OnStar(R) 
Call Center advisor that this call is for 
vehicle diagnostic purposes.

Go to 

Use the scan tool to access the STID and 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

UNABLE TO CONTACT ONSTAR CALL CENTER 

Diagnostic Aids 

z

The customer concern may have been due to a lack of cellular service in a given area. A failure in the 
National Cellular Network infrastructure at the time of the customers failed connection that has since 
been repaired may also have been the cause.  

z

If an OnStar(R) Emergency call is able to successfully connect the vehicle to the OnStar(R) Call Center 
when an OnStar(R) Call Center button press is not, there may be a failure in the ability of the OnStar(R) 
system in the vehicle to be recognized by the local cellular carrier.  

z

If the prompt "OnStar(R) request ended" is heard without depressing the white "Dot" button at the end of 
the an OnStar(R) keypress, the OnStar(R) system at one time has made a successful cellular connection 
but was unable to complete the call. If repeated calls are placed with this result, contact the General 
Motors Technical Assistance Center.  

Unable to Contact OnStar Call Center 

Was the attempt successful?

Diagnostic 

Aids

ESN and contact the General Motors 

Technical Assistance Center

Step

Action

Value

Yes

No

Schematic Reference:OnStar Schematics 
Connector End View Reference:Cellular Communication Connector End Views 
DEFINITION: When the OnStar(R) Call Center button is pressed, no connection is made to the OnStar
(R) Call Center.

1

Did you perform the cellular 
Communication Diagnostic System 
Check?

-

Go to Step 2

Go to Diagnostic 

System Check - 

Cellular 

Communication

2

1. Press the OnStar(R) Call Center 

button.  

2. Wait for the system to either 

connect or end the call.  

Is a connection made with the OnStar(R) 
Call Center?

IMPORTANT:

It is important to have the vehicle in 
an open outside area where a cellular 
call can be successfully placed and 
GPS data can be received from 
satellites.

-

Go to Diagnostic Aids

Go to Step 3

3

Other than the normal progression tones 
of the system and the prompt "Unable to 
Contact OnStar(R)", were any other 

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

tones or cellular messages heard?

Go to Step 4

Go to Step 5

4

1. Record all messages heard from 

the OnStar(R) Call Center button 
press.  

2. Press the OnStar(R) Emergency 

button.  

Does the emergency keypress call make 
a connection to the OnStar(R) Call 
Center within 10 minutes?

IMPORTANT:

Placing an emergency call to the 
OnStar Call Center should only be 
made if the diagnosis of the system 
leads to this step. Immediately after an 
OnStar(R) advisor picks up the call, 
they should be told that this call is for 
diagnostic purposes only and there is 
no emergency.

-

Have all messages heard 

during the course of the 

tests available, use the 

scan tool to access the 

STID, ESN and 

Transceiver I.D. and 

contact the General 

Motors Technical 

Assistance Center

Go to Step 5

5

Inspect the cellular and navigation 
antenna for exterior damage. 
Is the antenna assembly damaged?

-

Go to Step 9

Go to Step 6

6

1. Disconnect the cellular antenna 

coax from the vehicle 
communication interface module.  

2. Disconnect the cellular antenna 

coax from the cellular and 
navigation antenna.  

3. Measure the resistance from the 

center conductor of the coax to the 
metal outer shield.  

Does the meter read out of limits?

-

Go to Step 7

Go to Step 8

7

Measure the resistance of the cellular 
antenna coax center conductor from end 
to end. 
Does the resistance measure greater than 
the specified value?

1 

ohm

Go to Step 8

Use the scan tool to 

access the STID, ESN 

and Transceiver I.D. and 

contact the General 

Motors Technical 

Assistance Center

8

Replace the cellular antenna coax. 
Did you complete the replacement?

-

Go to Step 10

-

9

Replace the cellular and navigation 
antenna assembly. Refer to Antenna 
Assembly Replacement - Cellular and 

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

MICROPHONE INOPERATIVE - CALLER CANNOT BE HEARD 

Microphone Inoperative - Caller Cannot Be Heard 

Navigation . 
Did you complete the replacement?

Go to Step 10

-

10

Operate the system in order to verify the 
repair. 
Did you correct the condition?

-

System OK

Go to Step 2

Step

Action

Value

(s)

Yes

No

Schematic Reference:OnStar Schematics 
Connector End View Reference:Cellular Communication Connector End Views 
DEFINITION: The OnStar(R) Call Center operator can clearly be heard but the operator is unable to 
hear the caller.

1

Did you perform the Cellular 
Communication Diagnostic System Check?

-

Go to Step 2

Go to Diagnostic 

System Check - 

Cellular 

Communication

2

1. Turn ON the ignition, with the engine 

OFF.  

2. Press the OnStar(R) Call Center 

button.  

3. Ask the OnStar(R) operator if your 

voice can clearly be heard.  

Does the OnStar(R) operator hear your 
voice?

-

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in 

Wiring Systems

Go to Step 3

3

1. Turn OFF the ignition.  

2. Disconnect the cellular microphone 

connector.  

3. Turn ON the ignition, with the engine 

OFF.  

4. Measure the voltage from the cellular 

microphone signal circuit to a good 
ground.  

Does the voltage measure greater than the 
specified value?

9 V

Go to Step 4

Go to Step 5

4

Measure the voltage from the cellular 
microphone signal circuit to the drain wire 
circuit. 
Does the voltage measure greater than the 
specified value?

9 V

Go to Step 7

Go to Step 6

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

 

 

 

 

 

 

 

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