Hummer H3. Manual — part 1193

strap to chassis ground.

Capacitors work best on switch pops and low frequency noise.

Filters work best on high frequency whines and static.

After adding any suppression device, inspect all of the vehicle systems including those not
related to the audio system, for proper operation and function.

Whenever possible, make a test harness that includes filters or capacitors. Always inspect
the effectiveness and operation before permanent installation.

If an audible pop is caused due to operating a switch, perform the following repairs as
necessary:

Add a capacitor across the contacts of the switch.

Add a capacitor from the battery positive voltage (B+) side of the switch to chassis
ground.

Add a capacitor from the ground side of the switch to chassis ground.

Use the following available noise suppression devices:

220 micro farad (50 V) capacitor GM P/N 1227895-Works well for ignition system
related noise.

0.47 micro farad capacitor GM P/N 1227894-Works well for switches and relays.

Feed through capacitor GM P/N 477371-Works well for high current situations.

Filter package GM P/N 1224205-Works well for low current situations.

Fuel pump suppressor GM P/N 25027405

21 inch braided ground strap GM P/N 8910791

19 inch braided ground strap GM P/N 6286800

10.5 inch braided ground strap GM P/N 6287160

8.5 inch braided ground strap GM P/N 12091511

Generator Whine Concerns

1. Inspect the ground terminal and cable for high resistance.

2. Inspect the generator and brackets for loose or coated mounting bolts.

3. Inspect that the ground straps between the engine and the frame are clean and tight.

IMPORTANT: When installing suppression devices, signal wires such as

sensor and communication circuits should not be
suppressed. Battery and ignition voltage circuits are the best
choices for suppressing.

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2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

4. If the noise is still present, inspect the charging system for proper operation. Refer to

Diagnostic Starting Point - Engine Electrical .

5. Install a filter GM P/N 1224205 in the battery voltage feed circuit to the radio.

6. If the noise is not eliminated, install the filter in each following variation:

Install the filter with the single wire side toward the radio and the ground wire
attached to chassis ground.

Remove the ground to the filter.

Reverse the filter so the 2-wire side is toward the radio with the ground wire attached
to chassis ground.

Remove the ground from the filter.

7. If the filter GM P/N 1224205 causes a delay when turning the radio ON or OFF or other

problems, remove the filter and install a 0.47 micro farad capacitor to chassis ground.

8. Before reassembling the vehicle, remove any unneeded filters.

9. Test the functionality all of the vehicle systems including those not related to the audio

system, for proper operation and function.

AUDIO AMPLIFIER SETUP

To setup the audio amplifier, select the Recalibration feature under the Special Functions menu of
the scan tool and complete the setup procedure. Cycle the ignition when the calibration ends.
Setup is complete.

DIGITAL RADIO POOR OR NO RECEPTION

Digital Radio Poor or No Reception

Step

Action

Values

Yes

No

1

Did you perform the Diagnostic
System Check - Vehicle?

-

Go to Step 2

Go to
Diagnostic
System
Check -
Vehicle

2

1. Make sure the vehicle is

outside in an area with an
unobstructed view of the
southern sky.

2. Turn ON the ignition, with

the engine OFF.

-

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2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

3. Turn ON the radio.

4. Tune the radio to satellite

channel 1.

Is the reception clear?

Go to Step 3

Go to Step

5

3

Tune the radio to several other
satellite channels.
Is the reception clear?

-

Go to Audio
System
Troubleshooting
Hints

Go to Step

4

4

Contact XM at 1-800-556-3600 to
verify customer account status or
possible network problems.
Did you find and correct the
condition?

-

Go to Step 14

Go to Step

10

5

Contact XM at 1-800-556-3600 to
verify possible network problems.
Did you find and correct the
condition?

-

Go to Step 14

Go to Step

6

6

With a scan tool, observe the
digital radio antenna in the digital
radio receiver data list.
Does the scan tool indicate that the
digital radio antenna is within the
specified range?

17-63 mA

Go to Step 10

Go to Step

7

7

1. Disconnect the antenna cable

from the digital radio
receiver.

2. Measure the voltage from the

center conductor of the
antenna connector on the
digital radio receiver to one
of the case screws.

Does the voltage measure within
the specified range?

4.5-5.5 V

Go to Step 8

Go to Step

10

8

Test the antenna cable for an open,
short or high resistance. Refer to
Testing for Intermittent

-

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2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3

DIGITAL RADIO RECEIVER SETUP

Receiver Setup

Conditions and Poor
Connections .
Did you find the condition?

Go to Step 9

Go to Step

11

9

Replace the antenna cable.
Did you complete the replacement?

-

Go to Step 14

-

10

Inspect for poor connections at the
digital radio receiver. Refer to
Testing for Intermittent
Conditions and Poor
Connections .
Did you find and correct the
condition?

-

Go to Step 14

Go to Step

12

11

Inspect for poor connections at the
digital radio antenna. Refer to
Testing for Intermittent
Conditions and Poor
Connections .
Did you find and correct the
condition?

-

Go to Step 14

Go to Step

13

12

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

-

Go to Step 14

-

13

Replace the digital radio antenna.
Refer to Cellular
Communications/Digital Radio
Antenna Replacement.
Did you complete the replacement?

-

Go to Step 14

-

14

Operate the system in order to
verify the repair.
Did you correct the condition?

-

System OK

Go to Step

2

IMPORTANT: The digital radio receiver setup option does not contain a

submenu. Digital radio receiver setup will configure the following

2007 Hummer H3

2007 ACCESSORIES AND EQUIPMENT Cellular, Entertainment and Navigation - H3