Hummer H2. Manual - part 2057

Inflatable Restraint Sensing and Diagnostic Module (SDM) Terminal Identification 

Connector Part Information

z

12186989  

z

2-Way M Metri-Pack 280 Pull To Seat (YE)  

Pin

Wire Color

Circuit No.

Function

A

WH/BK

1403

I/P Module - High Control

B

D-GN/ 

WH

1404

I/P Module - Low Control

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

Inflatable Restraint Steering Wheel Module Terminal Identification 

Connector Part Information

z

15356922  

z

42-Way F Micro-Pack 100 W (YE)  

Pin

Wire Color

Circuit No.

Function

1

YE

1139

Ignition 1 Voltage

2

TN/BK

371

I/P Module Disable Switch - Signal

3

BK/WH

238

Seat Belt Switch - Left

4

PK

353

I/P Module Suppression Indicator Control

5

GY

349

Discriminating Sensor - Left - Signal

6

WH/BK

2611

Discriminating Sensor - Right - Signal

7-8

-

-

Not Used

9

WH/BK

1403

I/P Module - High Control

10

D-GN/ 

WH

1404

I/P Module - Low Control

11

D-BU

1363

Seat Belt Switch - Left-Low Reference

12

D-GN

348

Steering Wheel Module - Low Control

13

WH

347

Steering Wheel Module - High Control

14-21

-

-

Not Used

22

D-BU

1128

SDM Class 2 Serial Data

23-25

-

-

Not Used

26

YE

354

Discriminating Sensor - Left-Low Reference

27

PU

2612

Discriminating Sensor - Right-Low Reference

28-31

-

-

Not Used

32

BK

2351

Ground

33-42

-

-

Not Used

 

2004 Hummer H2 

2004 RESTRAINTS SIR - Hummer H2

  

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: 

z

The identification of the control module(s) which commands the system.  

z

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  

z

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: 

z

Proper AIR BAG warning lamp operation  

z

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: 

z

Extended diagnostic time  

z

Incorrect diagnosis  

z

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