Hummer H3. Manual — part 1190

DTC B2482

Circuit Description

The OnStar® button assembly consists of 3 buttons, Call/Answer, OnStar® Call Center and
OnStar® Emergency. Ten volts are supplied to the button assembly on the keypad supply voltage
circuit. Each of the buttons, when pressed, completes the circuit across a resister allowing a
specific voltage to be returned to the vehicle communication interface module (VCIM) on the
keypad signal circuit. Depending upon the voltage range returned, the VCIM is able to identify
which button has been pressed.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2482 Cellular Phone Select Switch Range/Performance

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 15 seconds.

Conditions for Setting the DTC

A button is depressed or stuck for more than 15 seconds.

The above conditions are present for greater than 15 seconds.

10

Replace the VCIM. Refer to Control
Module References for replacement,
setup and programming.
Did you complete the replacement?

-

Go to Step

11

-

11

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

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

Action Taken When the DTC Sets

The VCIM will ignore all inputs from the OnStar® button assembly.

No calls can be placed.

The OnStar® status LED turns RED.

Conditions for Clearing the DTC

The button will be declared unstuck after a 50-millisecond normal cycle.

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

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

Test Description

The number below refers to the step number on the diagnostic table.

2: This step tests the at rest state of the keypad signal circuit.

DTC B2482

Step

Action

Values

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

1. Turn ON the ignition, with the

engine OFF.

2. Measure the voltage from the

keypad signal circuit at the
vehicle communication
interface module (VCIM)
connector to a good ground.

Does the voltage measure greater
than the specified value?

0 V

Go to Step 3 Go to Step 4

Test the keypad signal circuit for a

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

3

short to voltage or high resistance.
Refer to Circuit Testing and
Wiring Repairs .
Did you find and correct the
condition?

-

Go to Step 9 Go to Step 5

4

Test the keypad supply voltage
circuit for an open or short. Refer to
Circuit Testing and Wiring
Repairs .
Did you find and correct the
condition?

-

Go to Step 9 Go to Step 6

5

Inspect for poor connections at the
harness connector of the OnStar®
button assembly. Refer to Testing
for Intermittent Conditions and
Poor Connections and Connector
Repairs .
Did you find and correct the
condition?

-

Go to Step 9 Go to Step 7

6

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

-

Go to Step 9 Go to Step 8

7

Replace the OnStar® button
assembly. Refer to OnStar Button
Assembly Replacement.
Did you complete the replacement?

-

Go to Step 9

-

8

Replace the VCIM. Refer to
Control Module References for
replacement, setup and
programming.
Did you complete the replacement?

-

Go to Step 9

-

1. Use the scan tool in order to

clear the DTCs.

2. Operate the vehicle within the

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

DTC B2483 OR B2484

Circuit Description

The navigation antenna is connected to the vehicle communication interface module (VCIM) with
a RG-174 coax cable. The VCIM polls the data from the navigation antenna once every second.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

DTC B2483 GPS Sensor Circuit Low

DTC B2484 GPS Sensor Circuit Open

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 a navigation signal.

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

Action Taken When the DTC Sets

The OnStar® status LED turns red.

The OnStar® Call Center cannot locate the vehicle.

Conditions for Clearing the DTC

The VCIM detects the presence of a navigation antenna.

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

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

9

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