Hummer H2. Manual — part 497

2

1. Turn ON the ignition, with the

engine OFF.

2. Attempt to establish

communication with the
following modules:

z

The driver door module

z

The passenger door
module

z

The body control module

z

The powertrain control
module

z

The instrument panel
cluster

Does the scan tool communicate with
all of the modules?

Go to Step 3

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

3

1. Access the Class 2 Power Mode

in the Diagnostic Circuit Check
on the scan tool.

2. Rotate the ignition switch

through all positions while
observing the ignition switch
power mode parameter.

Does the ignition switch parameter
reading match the ignition switch
position for all switch positions?

IMPORTANT:

The engine may start during the
following step. Turn OFF the engine
as soon as you have observed the
Crank power mode.

Go to Step 4

Go to Power Mode

Mismatch in Body Control

System

4

With the scan tool, select the Display
DTCs function for each of the
following modules:

z

The driver door module

z

The passenger door module

z

The body control module

z

The powertrain control module

z

The instrument panel cluster

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

SCAN TOOL DATA LIST

Driver Door Module/Passenger Door Module

Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms - Doors

5

Does the scan tool display any DTCs
which begin with a "U"?

Go to Scan Tool Does Not

Communicate with Class 2

Device in Data Link

Communications

Go to Step 6

6

Does the scan tool display B1000 for
any of the modules?

Go to Diagnostic Trouble

Code (DTC) List in Body

Control System

Go to Diagnostic Trouble

Code (DTC) List

Scan Tool Parameter

Data List

Units Displayed

Typical Data

Value

Ignition ON/Engine OFF/Vehicle in PARK/All Doors Closed

Battery 1 (Low
Current)

Data

Volts

12.8

Battery 2 (High
Current)

Data

Volts

12.8

Boot S/W Part No.

Module Info.

Decimal

15XXXXXX

Boot S/W Suffix

Module Info.

ASCII

15XXXXXX

Cal. Module 1 Part No.

Module Info.

Decimal

15XXXXXX

Cal. Module 1 Part No.

Module Info.

ASCII

15XXXXXX

Cal. Module 2 Part No.

Module Info.

Decimal

15XXXXXX

Cal. Module 2 Part No.

Module Info.

ASCII

15XXXXXX

Door Ajar Switch

Inputs

On, Off

Off

Door Key Unlock

Inputs

Inactive/Active

Inactive

Door Lock Motor

Outputs

Idle, Lock, Unlock

Idle

Door Lock Switch

Outputs

Idle, Lock, Unlock

Idle

Driver LF Window
Switch

Inputs

Idle, Up, Down, Express Down

Idle

Driver RF Window
Switch

Inputs

Idle, Up, Down, Express Down

Idle

LR Window Switch

Inputs

Idle, Up, Down

Idle

Memory Switch

Inputs

Idle, Both, Memory 1, Memory 2

Idle

Mirror 5 Volt
Reference

Outputs

On, Off

5 Volts

Mirror Fold Motor
Current

Data

mA

0

Mirror Folding
Operation

Outputs

Idle, Extend, Retract

Idle

Mirror Heater

Outputs

Inactive, Active

Inactive

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

Body Control Module

SCAN TOOL DATA DEFINITIONS

The Passenger Door Module (PDM) scan tool data definitions are a brief description of each of the related
parameters displayed within the scan tool data display(s) for the PDM.

Mirror Horizontal
Position

Data

Volts

Varies

Mirror Motor

Outputs

Idle, Left, Right, Up, Down

Idle

Mirror Select Switch

Inputs

Neutral/Fold, Left, Right

Neutral

Mirror Switch

Inputs

Off, Up, Down, Left. Right, Extend,

Retract

Off

Mirror Vertical Position

Data

Volts

Varies

Operational S/W Part
No.

Module

Information

Decimal

15XXXXXX

Operational S/W Suffix

Module

Information

ASCII

XX

Psgr RF Window
Switch

Inputs

Idle/Up/Down/Express Down

Idle

Right Rear Window
Status

Inputs

Idle, Up, Down

Idle

Window Lockout
Switch

Inputs

Inactive/Active

Inactive

Window Lockout LED

Outputs

On, Off

Off

Window Motor Current

Data

mA

0

Window Motor Output

Outputs

Idle, Up, Down

Idle

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Ignition ON/Engine OFF/Vehicle in PARK/All doors closed

Battery Voltage

Data

Volts

Varies

Door Lock Switch

Inputs

Inactive/Active

Inactive

Door Unlock Switch

Inputs

Inactive/Active

Inactive

Key in Ignition

Inputs

Yes/No

Yes

Left Rear Door Ajar Sw.

Inputs

On/Off

Off

Right Rear Door Ajar Sw.

Inputs

On/Off

Off

Rear Door Lock Relay

Outputs

On/Off

Off

Rear Door Unlock

Outputs

On/Off

Off

Right Rear Window Up Relay

Outputs

Inactive/Active

Inactive

Right Rear Window Down Relay

Outputs

Inactive/Active

Inactive

Left Rear Window Up Relay

Outputs

Inactive/Active

Inactive

Left Rear Window Down Relay

Outputs

Inactive/Active

Inactive

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

Back Only Heat Indicator

This data parameter appears in two separate data-lists Inputs and Outputs. While monitoring the inputs
for the PDM this parameter reflects the requested state for the back only indicator. When monitoring the
outputs the parameter reflects the commanded state for the back only indicator.

Back Only Heat Mode

This data parameter reflects the operating state of the heated seat back only mode of operation. This mode
of operation is only available if the heated seat is active or on.

Backlighting Dimming Enabled

This data parameter indicates the status feature. Backlighting is the lighting from behind any text or
characters on the PDM switches or faceplate.

Base Software P/N

This is the part number stored within the PDM of the base software set required to activate the PDM. This
software set is often referred to as boot software.

Base Software Suffix

This suffix number is the stored indication of the revision level of the base software.

Battery 1 (Low Current)

The battery 1 (low current) parameter provides the voltage level on the battery 1 input. Battery 1 is the
low current input provides the power for the PDM's microprocessors and the low current outputs.

Battery 2 (High Current)

The battery 2 (high current) parameter provides the voltage level on the battery 2 input. Battery 2 is the
high current input provides the power for the PDM's high current outputs such as the power windows.

Calibration P/N

This is the part number stored within the PDM of the calibration set. The calibration software sets the
operational ranges and option levels for each of the PDM's functions. This software set is often referred to
as calibration software or calibration.

Calibration Suffix

This suffix number is the stored indication of the revision level of the calibration. This is often referred to
as the CAL ID.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2