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