Hummer H2. Manual - part 366

DTC B0560

Circuit Description

The instrument panel cluster (IPC) monitors the engine speed signal to determine the tachometer position. If the
IPC determines the engine speed signal voltage is out of the normal operating range, a DTC will set.

Conditions for Running the DTC

The engine speed is greater than 800 RPM.

The ignition voltage is greater than 9.0 volts, but less than 18 volts.

Conditions for Setting the DTC

The IPC detects that the commanded state of the driver and the actual state of the control circuit do not
match.

The above condition is present for at least 5.0 seconds.

Action Taken When the DTC Sets

The IPC stores the DTC in memory.

Conditions for Clearing the DTC

A last test failed (current DTC) clears when the diagnostic runs and does not fail.

A history DTC clears after 100 consecutive malfunction free warm-up cycles.

The IPC receives the clear code command from the scan tool.

DTC B0560

running this DTC as specified in the
supporting text.

Does the DTC reset?

Go to Step 2

System OK

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. Start the engine.

3. With the scan tool, observe the Engine Speed

parameter in the IPC Data 1 data list.

Go to Testing for

2004 Hummer H2

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

Does the Engine Speed parameter match the
tachometer display?

Intermittent Conditions

and Poor Connections

in Wiring Systems

Go to Step 3

1. Turn OFF the ignition.

2. Disconnect the powertrain control module

(PCM) connector C2.

3. Install the J 33431-C Signal Generator and

Instrument Panel Tester lead to the engine
speed signal circuit at the PCM harness
connector, and the other lead to a good
ground. See Special Tools and Equipment .

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

5. Set the J 33431-C Signal Generator and

Instrument Panel Tester to generate a
tachometer signal. See Special Tools and
Equipment .

Does the vehicle tachometer indicate an RPM
reading?

Go to Step 5

Go to Step 4

Test the engine speed signal circuit for an open, a
short to voltage or a short to ground. Refer to
Circuit Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

Go to Step 9

Go to Step 6

Inspect for poor connections at the PCM connector.
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 9

Go to Step 7

Inspect for poor connections at the harness
connector of the IPC. 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 9

Go to Step 8

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

IMPORTANT:

Program the replacement PCM.

Go to Step 9

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

Go to Step 9

1. Use the scan tool in order to clear the DTC's.

2004 Hummer H2

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

DTC B1372

Circuit Description

When the ignition switch is in the UNLOCK position, certain class 2 messages do not transmit. The instrument
cluster suspends the operation of the indicators and the gauges that are dependent on these messages until the
ignition switch is no longer in the UNLOCK position.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

There is a difference of at least 75% between the ignition 1 voltage circuit and the IPC battery positive voltage
circuit for 3 seconds.

Action Taken When the DTC Sets

The odometer and the PRNDL displays do not illuminate.

The fuel gauge and the engine coolant temperature gauge default to 0.

The scan tool does not communicate with the instrument cluster.

Conditions for Clearing the DTC

The DTC becomes history when the conditions for setting the DTC are no longer present.

The history DTC clears after 100 malfunction free warm-up cycles.

The IPC receives the clear code command from the scan tool.

Diagnostic Aids

When the instrument cluster detects low voltage at the ignition 1 voltage circuit, the instrument cluster
will not communicate with the scan tool, and the odometer and PRNDL displays will not be illuminated.
The season odometer will display if the trip reset switch is pressed, and the instrument cluster will
communicate with the scan tool until the trip reset switch is released.

An intermittent condition is likely to be caused by an open condition in the ignition 1 voltage circuit.

DTC B1372 can only be read by the scan tool as a history code once the fault is removed. Refer to Scan
Tool Does Not Communicate with Class 2 Device in Data Link Communications for diagnosis of a loss
of communication with the instrument cluster.

2. Operate vehicle within the conditions for

running this DTC as specified in the
supporting text.

Does the DTC reset?

Go to Step 2

System OK

2004 Hummer H2

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

DTC B2961

Circuit Description

The body control module (BCM) monitors the ignition key alarm switch. When the key is in the ignition, the
ignition key alarm switch is closed with the signal circuit as low. When the key is not in the ignition, the
ignition key alarm switch is open with the signal circuit as high.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ignition 1 input is active and the key in ignition switch signal circuit is inactive and the signal circuit
is high.

The above conditions must be present for more than 5 seconds.

Action Taken When the DTC Sets

The BCM stores DTC B2961 in memory.

Conditions for Clearing the DTC

The DTC becomes history when the fault is no longer present.

A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no
longer present.

The BCM receives the clear code command from the scan tool.

DTC B2961

Step

Action

Yes

Schematic Reference: Audible Warnings Schematics
Connector End View Reference: Instrument Panel, Gauges, and Console Connector End Views or
Body Control System Connector End Views

Did you perform the Audible Warnings Diagnostic System Check?

Go to

Step 2

Go to Diagnostic

System Check -

Audible Warnings

1. Install a scan tool.

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

3. With the scan tool, observe the Key In Ignition parameter in

the BCM Inputs data list.

Does the Key In Ignition parameter display Yes?

Go to

Step 3

Go to Step 4

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

2004 Hummer H2

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

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