Hummer H2. Manual — part 365
Security Lamp State
The scan tool displays On, Off or Flashing. This is the security lamp state as commanded by the BCM.
Service 4WD
The scan tool displays On or Off. This is the state of the service 4WD indicator as commanded by the
IPC.
Service Throttle Soon
The scan tool displays On or Off. This is the state of the service throttle soon indicator as commanded by
the IPC.
Tow/Haul
The scan tool displays On or Off. This is the state of the Tow/Haul indicator as commanded by the IPC.
Trans Fluid Hot
The scan tool displays On or Off. This is the state of trans fluid hot indicator as commanded by the IPC.
Trip Reset Switch
The scan tool displays On or Off. The IPC monitors the trip reset switch. A closed switch is displayed as
On.
Upshift Lamp
The scan tool displays On or Off. This is the state of the upshift lamp as commanded by the IPC.
Vehicle Speed
The scan tool displays 0-255 km/h (0-159 mph). The BCM receives the vehicle speed information from
the PCM 4 kppm vehicle speed signal circuit.
Vehicle Speed
The scan tool displays 0-255 km/h (0-159 mph). The DIC receives the vehicle speed information from the
PCM 4 kppm vehicle speed signal circuit.
Vehicle Speed
The scan tool displays kilometers per hour (miles per hour). The IPC receives the vehicle speed from the
PCM 4 kppm vehicle speed signal circuit.
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
Vehicle Speed
The scan tool displays 0-255 km/h (0-159 mph). The PCM monitors the voltage at the signal circuit of the
vehicle speed sensor. The voltage is proportional to the vehicle speed.
Volume
The scan tool displays 0-100%. The percentage of volume selected at the radio.
Wait to Start
The scan tool displays On or Off. This is the state of the WAIT TO START indicator as displayed in the
IPC.
Water in Fuel
The scan tool displays On or Off. This is the state of the water in fuel indicator in the message center as
commanded by the IPC.
DIAGNOSTIC TROUBLE CODE (DTC) LIST
Diagnostic Trouble Code (DTC) List
DTC B0540
DTC
Diagnostic Procedure
Module(s)
B0540
DTC B0540
DIC
B0560
DTC B0560
DIC
B1372
DTC B1372
IPC
B2961
DTC B2961
BCM
BXXXX
z
Diagnostic Trouble Code (DTC) List in Lighting Systems
z
Diagnostic Trouble Code (DTC) List in SIR
BCM, SDM
CXXXX Refer to Diagnostic Trouble Code (DTC) List in Anti-lock Brake System
EBCM
P0461
DTC P0461
PCM
P0462
DTC P0462
PCM
P0463
DTC P0463
PCM
P0502
DTC P0502 in Automatic Transmission - 4L60-E
PCM
P0503
DTC P0503 in Automatic Transmission - 4L60-E
PCM
P0522
DTC P0522
PCM
P0523
DTC P0523
PCM
P0608
DTC P0608
PCM
P0654
DTC P0654
PCM
PXXXX Diagnostic Trouble Code (DTC) List in Engine Controls 6.0L (LQ4).
PCM
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
Circuit Description
The instrument panel cluster (IPC) monitors the vehicle speed signal to determine the speedometer position. If
the IPC determines the vehicle speed signal voltage is out of the normal operating range, a DTC will set.
Conditions for Running the DTC
z
The vehicle speed is more than 10 km/h (6 mph).
z
The ignition voltage is between 9.0-18.0 volts.
Conditions for Setting the DTC
z
The IPC detects that the commanded state of the driver and the actual state of the control circuit do not
match.
z
The condition above must be present for a minimum of 5 seconds.
Action Taken When the DTC Sets
z
The IPC stores a DTC B0540 in memory.
z
The speedometer defaults to 0 km/h (0 mph).
z
No driver warning message will be displayed for this DTC.
Conditions for Clearing the DTC
z
The history DTC clears after 100 malfunction free warm-up cycles.
z
The DTC becomes history when the conditions for setting the DTC are no longer present.
z
The IPC receives the clear code command from the scan tool.
DTC B0540
Step
Action
Yes
No
Schematic Reference:Instrument Cluster Schematics
1
Did you perform the instrument panel cluster (IPC)
Diagnostic System Check?
Go to Step 2
Go to Diagnostic
System Check -
Instrument
Cluster
2
1. Install a scan tool.
2. Raise the vehicles drive wheels. Refer to
Lifting and Jacking the Vehicle in General
Information.
3. Start the engine.
4. Place the transmission into drive for an
automatic transmission and third gear for a
manual transmission.
5. With the scan tool, observe the Vehicle Speed
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
Sensor parameter in the powertrain control
module (PCM) Engine Data 1 data list.
Does the Vehicle Speed Sensor parameter match the
speedometer display?
Go to Testing for
Intermittent Conditions
and Poor Connections
in Wiring Systems
Go to Step 3
3
1. Turn OFF the ignition.
2. Disconnect the PCM connector C2.
3. Install the J 33431-C Signal Generator and
Instrument Panel Tester lead to the vehicle
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 to generate a speedometer
signal. See Special Tools and Equipment .
Does the vehicle speedometer indicate a reading?
Go to Step 5
Go to Step 4
4
Test the vehicle speed signal circuit for an open,
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
5
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
6
Inspect for a poor connection 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
7
Did you complete the replacement?
IMPORTANT:
Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control
Module (PCM) Replacement in Engine Controls-
6.0L (LQ4).
Go to Step 9
-
8
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.
2. Operate vehicle within the conditions for
2004 Hummer H2
2004 ACCESSORIES & EQUIPMENT Instrument Panel, Gauges, and Console - Hummer H2
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