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