Hummer H2. Manual — part 2025
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC STARTING POINT - SIR
Begin the system diagnosis with Diagnostic System Check - SIR . The Diagnostic System Check - SIR will
provide the following information:
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The identification of the control module(s) which commands the system.
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The ability of the control module(s) to communicate through the serial data circuit.
z
The identification of any stored diagnostic trouble codes (DTCs) and their status.
The use of Diagnostic System Check - SIR will identify the correct procedure for diagnosing the system and
where the procedure is located.
DIAGNOSTIC SYSTEM CHECK - SIR
These diagnostic procedures will help you to find and repair SIR system malfunctions. This service category
Connector Part Information
z
54560210
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2-Way F Framatone ABX-3 Code C (YE)
Pin
Wire Color
Circuit No.
Function
A
WH
347
Steering Wheel Module - High Control
B
D-GN
348
Steering Wheel Module - Low Control
CAUTION: Refer to SIR Special Tool Caution in Cautions and Notices.
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
also contains information for repairing SIR system malfunctions. For best results, use the diagnostic tables, and
follow the sequence listed below:
1. Perform the Diagnostic System Check - SIR. All SIR diagnostics must begin with the A Diagnostic
System Check - SIR. The Diagnostic System Check - SIR determines the following results:
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Proper AIR BAG warning lamp operation
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Ability of the SDM to communicate through the data link connector (DLC)
z
Existence of SIR current and/or history diagnostic trouble codes (DTC)
2. Refer to the diagnostic table as directed by the A Diagnostic System Check - SIR. The diagnostic tables
will help enable you to diagnose any SIR system malfunction. Bypassing these procedures may result in
the following problems:
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Extended diagnostic time
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Incorrect diagnosis
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Incorrect parts replacement
3. Repeat the Diagnostic System Check - SIR after you perform any repairs or diagnostic procedures. This
will verify that you correctly performed the repair. This will also ensure that no other malfunctions exist.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1: This step checks to see if the AIR BAG warning lamp flashes seven times and then turns off when the
ignition key is turned ON.
2: This step checks to see if the scan tool powers up.
3: This step checks to see if the scan tool can communicate with the inflatable restraint sensing and
diagnostic module (SDM).
4: This step checks to see if there are any current or history diagnostic trouble codes (DTCs) present.
5: This step checks to see if there are communication DTCs (U-codes) present.
6: This step checks to see if DTC B1000 (ECU Malfunction) is present.
Diagnostic System Check - SIR
Step
Action
Yes
No
1
1. Note the AIR BAG
warning lamp while
turning the ignition switch
ON.
2. The AIR BAG warning
lamp should turn OFF after
flashing seven times.
Does the AIR BAG warning
lamp flash seven times and then
turn off?
Go to Step 2
Go to Symptoms - SIR
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
SCAN TOOL DATA LIST
The SIR Scan Tool Data List contains all the restraint system related parameters that are available on the scan
tool. The parameters in the list are arranged in alphabetical order. The column, "Data List," indicates the
location of the parameter within the scan tool menu selections.
Use the SIR Scan Tool Data List as directed by a diagnostic table or in order to supplement the diagnostic
procedures. Begin all of the diagnostic procedures with the SIR Diagnostic System Check. Use the SIR Scan
Tool Data List after the following are determined:
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There is no published DTC procedure nor published symptom procedure for the customer concern.
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The DTC or symptom diagnostic procedure indicated by the diagnostic system check does not resolve the
customer concern.
The Typical Data Values are obtained from a properly operating vehicle under the conditions specified in the
first row of the Scan Tool Data List table. Comparison of the parameter values from the suspect vehicle with the
Typical Data Values may reveal the source of the customer concern.
2
Install a scan tool.
Does the scan tool power up?
Go to Step 3
Go to Scan Tool Does Not
Power Up in Data Link
Communications
3
Attempt to establish
communication with the
inflatable restraint sensing and
diagnostic module (SDM).
Does the scan tool communicate
with the SDM?
Go to Step 4
Go to Scan Tool Does Not
Communicate with Class 2
Device in Data Link
Communications
4
1. Use the scan tool to
request the SIR diagnostic
trouble code (DTC)
display.
2. Record the displayed DTC
(s) on the repair order,
specifying as current or
history.
Does the scan tool display any
current or history DTCs?
Go to Step 5
System OK
5
Does the scan tool display any
DTC's 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 DTC
B1000?
Go to DTC B1000 in Body
Control System
Go to Diagnostic Trouble
Code (DTC) List
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
SIR Scan Tool Data List
SCAN TOOL DATA DEFINITIONS
The SIR scan tool data definitions contain a brief description of all SIR related parameters available on the scan
tool. The parameters that are available on the scan tool are listed below in alphabetical order.
8 Digit GM Part Number
The scan tool displays an 8 digit part number. This number is the GM part number that is stored within
the SDM memory.
Active Switch
The scan tool displays enabled or disabled. The signal from the inflatable restraints I/P module disable
switch indicates whether the passenger frontal air bag is enabled or disabled.
Calibration ID
The scan tool displays a 4 digit number. This calibration ID is the check sum of the SDM read only
memory contents.
Component Serial Number
The scan tool displays the digits of the SDM serial number.
Driver Side Belt Status
The scan tool displays Buckled or Unbuckled. The signal from the drivers seat belt switch indicates
whether the driver seat is buckled or unbuckled.
Scan Tool Parameter
Data List
Units Displayed
Typical Data Value
Ignition ON/Engine OFF/Driver Seat Belt Buckled/Active Switch Enabled
8-Digit GM Part Number
Module Information 2
8-digit number
XXXXXXXX
Active Switch
Inputs
Enabled/Disabled
Enabled
Calibration ID
Module Information 1
4-digit number
Varies
Component Serial Number
Module Information 2
4-digit number
XXXX
Driver Side Belt Status
Inputs
Buckled/Unbuckled
Buckled
Electronic Front End Sensor 1 ID
Module Information 1
2-digit number
Varies
Electronic Front End Sensor 2 ID
Module Information 1
2-digit number
Varies
Ignition Voltage
Data
Volts
12 volts
Julian Date of Build
Module Information 1
3-digit number
Varies
ROM ID
Module Information 1
4-digit number
Varies
Year Module Built
Module Information 1
4-digit number
Varies
2004 Hummer H2
2004 RESTRAINTS SIR - Hummer H2
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