Hummer H3. Manual — part 1136

CHARGE INDICATOR INOPERATIVE

Charge Indicator Inoperative

3

2. With a scan tool, observe

the Battery Voltage
parameter in the instrument
panel cluster (IPC) data list.

Does the voltage measure within
the normal operating range?

12.5-15.5 V

Go to Step 4

Go to
Charging
System Test

4

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

-

Go to Step 5

-

5

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

-

System OK

Go to Step 2

Step

Action

Yes

No

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check
- Vehicle

2

Turn ON the ignition, with the engine OFF
observe the charge indicator on the instrument
panel cluster (IPC).
Is the charge indicator illuminated?

Go to Testing
for
Intermittent
Conditions
and Poor
Connections

Go to Step 3

3

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

Go to Step 4

-

4

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

System OK

Go to Step 2

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

GENERATOR NOISE DIAGNOSIS

Diagnostic Aids

Noise from a generator may be due to electrical or mechanical noise. Electrical noise, magnetic
whine, usually varies with the electrical load placed on the generator and is a normal operating
characteristic of all generators. When diagnosing a noisy generator, it is important to remember
that loose or misaligned components around the generator may transmit the noise into the
passenger compartment and that replacing the generator may not solve the problem.

Generator Noise Diagnosis

Step

Action

Yes

No

1

Test the generator for proper operation
using the Generator Tester. Refer to
Charging System Test.
Is the generator operating properly?

Go to Step 2

Go to Step 11

2

1. Start the engine. Verify that the noise

can be heard.

2. Turn OFF the engine.

3. Disconnect the 4-way connector from

the generator.

4. Start the engine.

5. Listen for the noise.

Has the noise stopped?

Go to Step 11

Go to Step 3

3

1. Turn OFF the engine.

2. Remove the drive belt. Refer to

Drive Belt Replacement (Without
A/C) or Drive Belt Replacement
(With A/C) .

3. Spin the generator pulley by hand.

Does the generator shaft spin smoothly and
without any roughness or grinding noise?

Go to Step 4

Go to Step 11

4

Inspect the generator for a loose pulley
and/or pulley nut.
Is the generator pulley or pulley nut loose?

Go to Step 11

Go to Step 5

1. Loosen all of the generator mounting

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

5

bolts.

2. Tighten the generator mounting bolts

to specifications and in the proper
sequence, if necessary. Refer to
Generator Replacement.

3. Install the drive belt. Refer to Drive

Belt Replacement (Without A/C)
or Drive Belt Replacement (With
A/C) .

4. Start the engine.

Has the noise decreased or stopped?

System OK

Go to Step 6

6

Inspect the generator for the following
conditions:

Strained or stretched electrical
connections

Hoses or other vehicle equipment
resting on the generator, which may
cause the noise to be transmitted into
the passenger compartment

Are any electrical connections pulling on
the generator or are any hoses, etc. resting
on the generator?

Go to Step 7

Go to Step 8

7

1. Reroute the electrical connections to

relieve the tension.

2. Reroute the hoses, etc. away from the

generator.

3. Start the engine.

Has the noise decreased or stopped?

System OK

Go to Step 8

8

Inspect the drive belt for proper tension.
Refer to Drive Belt Tensioner
Diagnosis .
Is the drive belt loose?

Go to Step 9

Go to Step 10

1. Replace the drive belt tensioner.

2007 Hummer H3

2007 ENGINE Engine Electrical - H3

STARTER SOLENOID DOES NOT CLICK

Starter Solenoid Does Not Click

9

Refer to Drive Belt Tensioner
Replacement .

2. Start the engine.

Has the noise decreased or stopped?

System OK

Go to Step 11

10

Compare the vehicle with a known good
vehicle.
Do both vehicles make the same noise?

System OK

Go to Step 11

11

Replace the generator. Refer to
Generator Replacement.Has the noise
decreased or stopped?

IMPORTANT:

If no definite generator problems were found,
be sure that all other possible sources of
objectionable noise are eliminated before
replacing the generator. Replacing the
generator may not change the noise level if
the noise is a normal characteristic of the
generator or the generator mounting.

Go to Step 12

-

12

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

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: Starting and Charging Schematics

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

2

Turn the ignition switch to the START
position.
Does the engine crank?

Go to Testing
for Intermittent
Conditions and
Poor
Connections

Go to Step 3

Is the security indicator flashing?

Go to
Diagnostic

2007 Hummer H3

2007 ENGINE Engine Electrical - H3