Hummer H3. Manual — part 11

CHARGE INDICATOR ALWAYS ON

12

circuit, if equipped, for an open or high
resistance. Refer to Circuit Testing
andWiring Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step

19

Go to Step 14

13

Inspect for poor connections at the
harness connector of the powertrain
control module (PCM). 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

19

Go to Step 17

14

Inspect for poor connections at the
generator. 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

19

Go to Step 18

15

Repair the high resistance or open in the
ground circuit of the generator. Refer to
Wiring Repairs in Wiring Systems.
Did you complete the repair?

-

Go to Step

19

-

16

Repair the high resistance or open in the
generator output circuit. Refer to Wiring
Repairs in Wiring Systems.
Did you complete the repair?

-

Go to Step

19

-

17

Replace the PCM. Refer to Control
Module References in
Computer/Integrating Systems for
replacement, setup, and programming.
Did you complete the replacement?

-

Go to Step

19

-

18

Replace the generator. Refer to
Generator Replacement.
Did you complete the replacement?

-

Go to Step

19

-

19

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

-

System OK

Go to Step 2

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

Charge Indicator Always On

CHARGE INDICATOR INOPERATIVE

Charge Indicator Inoperative

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check -
Vehicle?

Go to Step 2

Go to

Diagnostic

System Check -

Vehicle in

Vehicle DTC

Information

2

1. Turn ON the ignition, with the engine OFF.

2. Observe the Charge indicator on the

instrument panel cluster (IPC).

Does the charge indicator illuminate?

Go to Step 3

Go to

Symptoms -

Engine

Electrical

3

1. Turn OFF the ignition.

2. Disconnect the generator connector.

3. Turn ON the ignition, with the engine OFF.

Does the charge indicator illuminate?

Go to Step 4

Go to Charging

System Test

4

Test the charge indicator control circuit for a short
to ground. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 6

Go to Step 5

5

Replace the powertrain control module (PCM).
Refer to Control Module References in
Computer/Integrating Systems for replacement,
setup, and programming.
Did you compete the replacement?

Go to Step 6

-

6

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

System OK

Go to Step 3

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check -
Vehicle?

Go to

Diagnostic

System Check -

Vehicle in

2006 Hummer H3

2006 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

Go to Step 2

Vehicle DTC

Information

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 in

Wiring Systems

Go to Step 3

3

Replace the IPC. Refer to Control Module
References in Computer/Integrating Systems 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

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.

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

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) for the
3.5L engine.

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

5

1. Loosen all of the generator mounting 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) for the
3.5L engine.

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

2006 Hummer H3

2006 ENGINE Engine Electrical - H3