Hummer H2. Manual - part 214

 

  Index      Hummer     Hummer H2 - service repair manual 2004 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  212  213  214  215   ..

 

 

Hummer H2. Manual - part 214

 

 

z

All the above conditions are present for greater than 1 second.  

Action Taken When the DTC Sets 

z

The OnStar(R) status LED turns RED.  

z

The OnStar(R) Call Center cannot locate the vehicle.  

Conditions for Clearing the DTC 

z

The VCIM detects the presence of the cellular and navigation antenna.  

z

A history DTC clears after 50 malfunction free ignition cycles.  

z

The VCIM receives the clear DTC command from the scan tool.  

DTC B2483 or B2484 

Step

Action

Values 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

1. Disconnect the blue navigation antenna coax 

connector from the cellular and navigation antenna. 

2. Disconnect the navigation antenna coax from the 

vehicle communication interface modules (VCIM). 

3. Measure the resistance from the center conductor of 

the coax to the metal outer shield.  

Does the meter read out of limits?

NOTE:

Using a DMM to measure the resistance of the 
navigation antenna coax from the center conductor to 
the outer shield while the antenna is still connected 
will damage the navigation antenna.

-

Go to 

Step 

3

Go to Step 4

3

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

1.0 

ohm

Go to 

Step 

4

Go to Step 5

4

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

-

Go to 

Step 

7

-

Inspect for poor connections at the cellular and navigation 
antenna and the harness connector of the VCIM. Refer to 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

DTC U1500 

Circuit Description 

This DTC indicates an internal fault and is set within the vehicle communication interface module (VCIM). No 
external circuits are involved. 

Conditions for Running the DTC 

The microprocessor runs the program to detect an internal fault during module power up and every 10 seconds 
thereafter until the module re-enters the sleep mode. 

Conditions for Setting the DTC 

The VCIM detects an internal communication malfunction. 

Action Taken When DTC Sets 

z

The OnStar(R) status LED turns RED. 

5

Testing for Intermittent Conditions and Poor 
Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to 

Step 

7

Go to Step 6

6

Replace the cellular and navigation antenna. Refer to 
Antenna Assembly Replacement - Cellular and 
Navigation . 
Is the repair complete?

-

Go to 

Step 

7

-

7

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within the Conditions for 

Running the DTC as specified in the supporting 
text.  

Does the DTC reset?

-

Go to 

Step 

8

System OK

8

Replace the VCIM. Refer to Communication Interface 
Module Replacement . 

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within the Conditions for 

Running the DTC as specified in the supporting 
text.  

Does the DTC reset?

IMPORTANT:

Perform the OnStar(R) setup procedure.

-

Go to 

Step 

2

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

z

The vehicle is unable to connect to the OnStar(R) Call Center.  

Conditions for Clearing the DTC 

z

A current DTC clears when the malfunction is no longer present.  

z

A history DTC clears after 50 malfunction free ignition cycles.  

Diagnostic Aids 

z

The diagnostic procedure used for DTC U1500 in OnStar(R) systems with single module generations of 
OnStar(R) differ greatly from previous generations with 2 modules. While these older generations 
denoted a failure of the 3-wire bus between the modules by setting a U1500, single module OnStar(R) 
systems use this DTC to denote an internal module failure. The determination of whether a one or 2-
module generation of OnStar(R) is used should be confirmed. Refer to OnStar Description and 
Operation .  

z

This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as 
a history DTC and not retrieved as a current DTC, do not replace the VCIM.  

z

If this DTC is retrieved as both a current and history DTC, replace the VCIM.  

DTC U1500 

ONSTAR SYMPTOM DIAGNOSIS 

Step

Action

Yes

No

1

Did you perform the Cellular Communication 
Diagnostic System Check?

Go to 

Step 2

Go to Diagnostic System Check 

- Cellular Communication

2

1. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

3. Retrieve DTCs from the vehicle communication 

interface module (VCIM).  

Is the DTC retrieved as a current DTC?

Go to 

Step 3

Go to Diagnostic Aids

3

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

IMPORTANT:

Perform the OnStar(R) setup procedure.

Go to 

Step 4

-

4

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within the Conditions for 

Running the DTC as specified in the supporting 
text.  

Does the DTC reset?

Go to 

Step 2

System OK

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

System Description 

This symptom table will enable the user to verify the customer complaint and narrow it to its source. If there is a 
concern with voice recognition or OnStar(R) steering wheel control function, technicians should proceed 
directly to the applicable diagnostic in Symptoms - Cellular Communication . 

Diagnostic Aids 

z

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.  

z

If the prompt OnStar request ended is heard without pressing the white dot button at the end of 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.  

z

Inaccurate or aged global positioning system (GPS) position may have been due to the temporary loss of 
GPS signal reception by the vehicle in instances such as driving through tunnels or parking structures 
which restrict the navigation antenna from a clear view of the satellites in the sky.  

OnStar Symptom Diagnosis 

IMPORTANT: To successfully diagnose and repair the OnStar(R) system it is necessary to 

comprehend its operation. Technicians should read and understand the OnStar 
Description and Operation before attempting to repair an OnStar(R) system.

Step

Action

Yes

No

1

Did you perform the 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. Observe the OnStar(R) status 

LED.  

Does the LED turn GREEN?

Go to Step 3

Go to OnStar Button LED 

Inoperative

3

1. Turn the radio ON.  

2. Set volume to a comfortable 

level.  

3. Press the OnStar(R) Call Center 

button.  

4. Wait approximately 10 seconds 

then end the call by pressing the 
white dot button.  

Does both the OnStar(R) LED blink 
after the OnStar(R) keypress is made 
and the call ended after pressing the 

Go to OnStar One or More 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

 

 

 

 

 

 

 

Content   ..  212  213  214  215   ..