Hummer H2. Manual - part 416

 

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Hummer H2. Manual - part 416

 

 

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

1: Determines if the malfunction is present.  

3: Tests for an open in the vehicle speed signal circuit between the instrument cluster and the navigation 
radio. A short would cause the instrument cluster to malfunction as well as the navigation system.  

DTC B0004 

DTC B2462 

Circuit Description 

The global positioning system (GPS) antenna is connected to the navigation radio by a coaxial cable. 

Conditions for Running the DTC 

The radio must detect one of the following power modes:

Step

Action

Yes

No

Schematic Reference:Navigation System Schematics

1

Did you perform the Diagnostic System Check - 
Navigation System?

Go to 

Step 

2

Go Diagnostic System Check - 

Navigation System

2

Verify the instrument cluster speedometer operation. 
Does the speedometer work on the instrument cluster?

Go to 

Step 

3

Go to Diagnostic Starting Point - 

Instrument Panel, Gauges and 

Console in Instrument Panel, 

Gauges and Console

3

Test the vehicle speed signal circuit for an open 
between the instrument cluster and the navigation 
radio. Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 

6

Go to Step 4

4

Inspect for poor connections at the harness connector 
of the navigation radio. Refer to Testing for 
Intermittent Conditions and Poor Connections and 
Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 

6

Go to Step 5

5

Replace the navigation radio. Refer to Radio 
Replacement in Entertainment. 
Did you complete the replacement?

Go to 

Step 

6

-

6

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

2. Drive the vehicle at least 4 km (2.5 mi) with the 

GPS signal received.  

3. Leave vehicle running and retrieve DTCs.  

Does the DTC reset?

Go to 

Step 

2

System OK

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

  

z

ACC  

z

ON  

z

RAP  

z

RAP UNLK  

DTC B2462 does not set if DTC B1328 or B1327 is current. 

Conditions for Setting the DTC 

z

The navigation radio test the GPS antenna every 0.3 second.  

z

The radio determines there is an open in the GPS antenna.  

z

DTC B2462 does not set if DTC B1328 or B1327 is current.  

Action Taken When the DTC Sets 

Unable to get GPS location updated, the radio uses the last reported position and the vehicle speed signal to 
calculate the vehicle position. 

Route guidance may be inaccurate. 

This failure has no effect outside the navigation system. 

Conditions for Clearing the DTC 

z

A current DTC clears when the radio does not detect the failure for more than 10 seconds.  

z

A history DTC clears after 50 ignition cycles with no repeat of the failure.  

Diagnostic Aids 

An intermittent condition may be caused by the following: 

z

Mis-routed harness  

z

Rubbed through wire insulation  

z

Broken wire inside the insulation  

Test Description 

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

1: Determines if the malfunction is present.  

3: Determines if the malfunction is due to an internal fault in the navigation radio or a GPS antenna 
failure.  

DTC B2462 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

  

SYMPTOMS - NAVIGATION SYSTEMS 

z

Perform the Diagnostic System Check - Navigation 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.  

z

Review Navigation System Description and Operation in order to familiarize yourself with the system 
functions.  

Step

Action

Value

(s)

Yes

No

Schematic Reference:Navigation System Schematics

1

Did you perform Diagnostic System Check - Navigation 
System ?

-

Go to 

Step 2

Go to Diagnostic 

System Check - 

Navigation System

2

1. Turn OFF the ignition.  

2. Disconnect the GPS coaxial cable connector.  

3. Measure the voltage between the center conductor and 

the shield of the coaxial cable still attached to the 
navigation radio.  

Is the voltage within the specified range?

4.0-5.5 

V

Go to 

Step 5

Go to Step 3

3

Test the GPS cable for an open or short to ground. Refer to 
Circuit Testing and Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to 

Step 7

Go to Step 4

4

Inspect for poor connections at the harness connector of the 
GPS cable. Refer to 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

5

Replace the GPS antenna. Refer to Antenna Replacement - 
Global Positioning System (GPS) . 
Did you complete the replacement?

-

Go to 

Step 7

-

6

Replace the navigation radio. Refer to Radio Replacement 
in Entertainment. 
Did you complete the replacement?

-

Go to 

Step 7

-

7

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

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

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

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

  

Visual/Physical Inspection 

z

Inspect for aftermarket devices which could affect the operation of the navigation system components. 
Refer to Checking Aftermarket Accessories in Wiring Systems.  

z

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 Conditions and Poor Connections in Wiring Systems. 

Symptom List 

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

No Global Positioning System (GPS) Reception 

Navigation System - Vehicle Position Indicator Inoperative or Erratic 

NO GLOBAL POSITIONING SYSTEM (GPS) RECEPTION 

No Global Positioning System (GPS) Reception 

Step

Action

Value

(s)

Yes

No

Schematic Reference: Navigation System Schematics
DEFINITION: When using the navigation system, the GPS icon does not appear on the navigation radio.

1

Did you perform theDiagnostic System 
Check - Navigation System ?

-

Go to Step 2

Go to Diagnostic 

System Check - 

Navigation 

System

2

1. Move the vehicle to an open area 

outside of the building.  

2. Turn ON the ignition. The Navigation 

screen appears on the navigation radio. 

3. The display should show the current 

position of the vehicle. The GPS icon 
should appear green on the upper left 
corner of the screen, indicating that the 
navigation system has proper GPS 
reception.  

Does the system operate normally?

-

Go to Testing for 

Intermittent 

Conditions and Poor 

Connections in Wiring 

Systems

Go to Step 3

1. Leave the vehicle outside with the 

ignition ON or set to ACC for 30 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Navigation Systems - Hummer H2

  

 

 

 

 

 

 

 

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