Hummer H3. Manual — part 1188

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

Conditions for Setting the DTC

The navigation radio test the GPS antenna every 0.3 second.

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

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

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

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:

Mis-routed harness

Rubbed through wire insulation

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

Step

Action

Values

Yes

No

Schematic Reference: Radio/Navigation System Schematics
Connector End View Reference: Entertainment/Communication Connector End

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

Views

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

1. Turn OFF the ignition.

2. Disconnect the Global

Positioning System (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 .
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 .
Did you find and correct the
condition?

-

Go to Step 7 Go to Step 6

5

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

-

Go to Step 7

-

6

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

-

Go to Step 7

-

1. Use the scan tool in order to

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

DTC B2470

Circuit Description

The cellular antenna is connected to the vehicle communication interface module (VCIM) with a
RG-58 coax cable. The VCIM polls the data from the cellular antenna once every second.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2470 Cellular Phone Antenna Circuit Malfunction

Conditions for Running the DTC

The ignition must be in the RUN or ACC position.

The system voltage is at least 9.5 volts and no more than 15.5 volts.

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

Conditions for Setting the DTC

The VCIM does not detect the presence of a cellular antenna.

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

Action Taken When the DTC Sets

The OnStar® status LED turns red.

The vehicle is unable to connect to the OnStar® Call Center.

Conditions for Clearing the DTC

The VCIM detects the presence of a cellular antenna.

A history DTC clears after 50 malfunction-free ignition cycles.

7

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

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

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

Test Description

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

2: This step tests the condition of the cellular antenna.

3: This step tests the condition of the cellular antenna coax and for proper ground of the
cellular antenna.

DTC B2470

Step

Action

Value

Yes

No

Schematic Reference: OnStar Schematics
Connector End View Reference: Entertainment/Communication Connector End
Views

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

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

-

Go to Step 7 Go to Step 3

3

1. Disconnect the cellular antenna

coax from the vehicle
communication interface module
(VCIM).

2. Measure the resistance between

the center conductor and the
outer metal shield.

Does the meter read out of limits?

IMPORTANT:

The vehicle may be equipped with
sectioned coax. Test each section and
replace only the faulty section, not the
entire length of coax.

-

Go to Step 4 Go to Step 5

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3