Hummer H2. Manual - part 374

VOLT GAUGE INACCURATE OR INOPERATIVE

Volt Gauge Inaccurate or Inoperative

connector of the instrument cluster. 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 6

Go to Step 5

Replace the IPC. Refer to Instrument Panel
Cluster (IPC) Replacement .
Did you complete the replacement?

Go to Step 6

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

System OK

Go to Step 2

Step

Action

Yes

Schematic Reference:Instrument Cluster Schematics

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to Diagnostic

System Check -

Instrument Cluster

1. Turn the ignition ON, with the

engine OFF.

2. Install a scan tool.

3. With the scan tool, perform the

Displays Test in the IPC scan tool
Output Controls.

Does the gauge move from 0 to its
maximum value and back to 0 when
you perform the Displays Test?

Go to Step 3

Go to Step 4

1. Install a scan tool.

2. Start the engine.

3. With the scan tool, observe the

Battery Voltage parameter in the
BCM Data list.

Does the Battery Voltage parameter
match the gauge display?

Go to Testing for Intermittent

Conditions and Poor

Connections in Wiring Systems

Go to Step 4

Replace the instrument panel cluster
(IPC). Refer to Instrument Panel
Cluster (IPC) Replacement .
Did you complete the replacement?

Go to Step 5

1. Use the scan tool in order to clear

any induced DTCs.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

CHANGE ENGINE OIL INDICATOR ALWAYS ON

Change Engine Oil Indicator Always On

LOW ENGINE OIL LEVEL INDICATOR ALWAYS ON

Low Engine Oil Level Indicator Always On

2. Operate the system in order to

verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Step

Action

Yes

Schematic Reference: Instrument Cluster Schematics

Did you perform the Instrument Cluster
Diagnostic System Check?

Go to

Step 2

Go to Diagnostic System Check -

Instrument Cluster

Start the engine.
Does the CHANGE ENGINE OIL indicator
illuminate in the Driver Information Center?

Go to

Step 3

Go to Testing for Intermittent

Conditions and Poor Connections in

Wiring Systems

1. Install a scan tool.

2. With the scan tool, observe the Engine Oil

Life Remaining parameter in the PCM
Engine Data 2 data list.

Does the Engine Oil Life Remaining parameter
display 0%?

Go to

Step 4

Go to Step 5

Reset the engine oil life. Refer to GM Oil Life
System - Resetting in Maintenance and
Lubrication.
Does the CHANGE ENGINE OIL indicator turn
off?

Go to

Step 6

Go to Step 5

Replace the IPC. Refer to Instrument Panel
Cluster (IPC) Replacement .
Did you complete the replacement?

Go to

Step 6

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

System

Go to Step 2

Step

Action

Yes

Schematic Reference:Instrument Cluster Schematics

Did you perform the instrument panel cluster (IPC)
Diagnostic System Check?

Go to
Step 2

Go to Diagnostic System
Check - Instrument Cluster

1. Install a scan tool.

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

3. With the scan tool, observe the Engine Oil Level

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

Switch parameter in the powertrain control module
(PCM) Engine Data 2 data list.

Does the Engine Oil Level Switch parameter display Ok?

Go to
Step 3

Go to Step 4

Does the CHECK ENG OIL LEVEL indicator remain
illuminated after the displays test?

Go to
Step 11

Go to Testing for
Intermittent Conditions
and Poor Connections in
Wiring Systems

1. Turn OFF the ignition.

2. Disconnect the engine oil level switch.

3. Connect a 3-ampere fused jumper between the

signal circuit of the engine oil level switch and a
good ground.

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

5. With the scan tool, observe the Engine Oil Level

Switch parameter.

Does the Engine Oil Level Switch parameter display Ok?

Go to
Step 6

Go to Step 5

Test the signal circuit of the engine oil level switch for a
short to battery voltage, for an open or for a high
resistance. Refer to Circuit Testing and to Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to
Step 12 Go to Step 8

Test the ground circuit of the engine oil level switch for an
open or for a high resistance. Refer to Circuit Testing and
to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to
Step 12 Go to Step 7

Inspect for poor connections at the harness connector of
the engine oil level switch. Refer to Testing for
Intermittent Conditions and Poor Connections and to
Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to
Step 12 Go to Step 9

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

Go to
Step 12 Go to Step 10

Replace the engine oil level switch. Refer to Engine Oil
Level Sensor and/or Switch Replacement in Engine
Mechanical.
Did you complete the replacement?

Go to
Step 12 -

IMPORTANT:

Program the replacement PCM.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

DRIVER INFORMATION CENTER (DIC) SWITCH(ES) INOPERATIVE

Driver Information Center (DIC) Switch(es) Inoperative

Replace the PCM. Refer to Powertrain Control Module
(PCM) Replacement in Engine Controls-6.0L (LQ4).Did
you complete the replacement?

Go to
Step 12 -

Replace the IPC. Refer to Instrument Panel Cluster
(IPC) Replacement .
Did you complete the replacement?

Go to
Step 12 -

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

System
OK

Go to Step 2

Step

Action

Yes

Schematic Reference:Instrument Cluster Schematics

Did you perform the driver information center
(DIC) Diagnostic System Check?

Go to Step 2

Go to Diagnostic

System Check -

Driver Information

Systems

1. Install a scan tool.

2. Turn ON the ignition, with the engine

OFF.

3. Press and release each of the DIC

switches.

4. With a scan tool, observe the DIC Switch

parameters in the instrument panel cluster
(IPC) Input/Output data list.

Does the scan tool display ON when each switch
is pressed and OFF when each switch is
released?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

Does the scan tool display OFF when each
switch is pressed?

Go to Step 9

Go to Step 4

Does the scan tool always display ON for the
suspect switch even when the switch is released?

Go to Step 5

Go to Step 6

1. Turn OFF the ignition.

2. Disconnect the DIC switch connector.

3. Turn ON the ignition, with the engine

OFF.

4. With a scan tool, observe the suspect DIC

Switch parameter.

Does the scan tool display ON for the suspect
switch?

Go to Step 7

Go to Step 12

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2

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