Sierra 1500 2WD V8-5.3L Hybrid (2004)
Air Bag(s) Arming and Disarming: Service and Repair
SIR Disabling and Enabling
The SIR Identification Views shown below illustrate the approximate location of all SIR components available for the vehicle. This will assist in
determining the appropriate SIR Disabling and Enabling for a given service procedure. Refer to
There are several reasons for disabling the SIR system, such as repairs to the SIR system or servicing a component near or attached to an SIR
component. There are several ways to disable the SIR system depending on what type of service is being performed. The following information covers
the proper procedures for disabling/enabling the SIR system.
SIR Service Precautions
Caution: When performing service on or near the SIR components or the SIR wiring, the SIR system must be disabled. Failure to observe the correct
procedure could cause deployment of the SIR components. Serious injury can occur. Failure to observe the correct procedure could also result in
unnecessary SIR system repairs.
The inflatable restraint sensing and diagnostic module (SDM) maintains a reserved energy supply. The reserved energy supply provides deployment
power for the air bags if the SDM loses battery power during a collision. Deployment power is available for as much as 1 minute after disconnecting
the vehicle power. Waiting 1 minute before working on the system after disabling the SIR system prevents deployment of the air bags from the
reserved energy supply.
General Service Instructions
The following are general service instructions which must be followed in order to properly repair the vehicle and return it to its original integrity:
-
Do not expose inflator modules to temperatures above 65°C (150°F).
-
Verify the correct replacement part number. Do not substitute a component from a different vehicle.
-
Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system.
Discard any of the following components if it has been dropped from a height of 91 cm (3 feet) or greater:
-
Inflatable restraint sensing and diagnostic module (SDM)
-
Any Inflatable restraint air bag module
-
Inflatable restraint steering wheel module coil
-
Any Inflatable restraint sensor
-
Inflatable restraint seat belt pretensioners
-
Inflatable restraint Passenger Presence System (PPS) module or sensor
Disabling Procedure - Air Bag Fuse
1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Place the ignition in the OFF position.
Important: The SDM may have more than one fused power input. To ensure there is no unwanted SIR deployment, personal injury, or unnecessary
SIR system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR
BAG warning indicator illuminates. This is normal operation, and does not indicate a SIR system malfunction.
3. Locate and remove the fuse(s) supplying power to the SDM.
4. Wait 1 minute before working on the system.
