GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

General Information

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The Supplemental Inflatable Restraint (SIR) system offers protection in addition to that provided by the driver's seat belt by deploying an air bag from the center of the steering wheel. The air bag deploys when the vehicle is involved in a frontal crash of sufficient force up to 30° off the centerline of the vehicle. To further absorb the crash energy, there is also a knee bolster located beneath the instrument panel in the driver's area and the steering wheel is collapsible. The system has an energy reserve, which can store a large enough electrical charge to deploy the air bag(s) for up to ten minutes after the battery has been disconnected or damaged. The system MUST be disabled before any service is performed on or around SIR components or SIR wiring.

SERVICE PRECAUTIONS



See Figure 1



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Fig. Fig. 1: When storing an inflator module, ensure that the vinyl cover faces up



When performing service around the SIR system components or wiring, the SIR system MUST be disabled. Failure to do so could result in possible air bag deployment, personal injury or unneeded SIR system repairs.
 
When carrying a live inflator module, make sure that the bag and trim cover are pointed away from you. Never carry the inflator module by the wires or connector on the underside of the module. In case of accidental deployment, the bag will then deploy with minimal chance of injury.
 
When placing a live inflator module on a bench or other surface, always face the bag and trim cover up, away from the surface.
 

DISABLING THE SYSTEM



See Figures 2 through 7

  1. Turn the steering wheel so that the vehicle's wheels are pointing straight ahead.
  2.  
  3. Turn the ignition switch to LOCK , remove the key, then disconnect the negative battery cable.
  4.  
  5. Remove the AIR BAG fuse from the fuse block.
  6.  
  7. Remove the steering column filler panel or knee bolster.
  8.  
  9. Unplug the Connector Position Assurance (CPA) and yellow two way connector at the base of the steering column.
  10.  
  11. On 1998-99 models, remove the Connector Position Assurance (CPA) from the passenger yellow two way connector located behind the glove box.
  12.  
  13. On 1998-99 models, unplug the yellow two way connector located behind the glove box.
  14.  
  15. Connect the negative battery cable.
  16.  

With the AIR BAG fuse removed, the battery cable connected and the ignition in the ON position, the AIR BAG warning lamp will be ON. This is normal and does not indicate a system malfunction.



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Fig. Fig. 2: Remove the fuse panel cover



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Fig. Fig. 3: Look at the diagram on the back of the fuse panel cover to identify the location of the air bag fuse



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Fig. Fig. 4: Once located, remove the air bag fuse from the panel



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Fig. Fig. 5: Remove the lower left hand instrument panel knee bolster to access the Connector Position Assurance (CPA) 2-way connector located at the base of the steering column



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Fig. Fig. 6: Remove the clip that prevents the CPA from being accidentally disconnected ...



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Fig. Fig. 7: Unplug the CPA connector

ENABLING THE SYSTEM



  1. Disconnect the negative battery cable.
  2.  
  3. On 1998-99 models, attach the yellow two way connector located behind the glove box.
  4.  
  5. On 1998-99 models, install the Connector Position Assurance (CPA) to the passenger yellow two way connector located behind the glove box.
  6.  
  7. Turn the ignition switch to LOCK , then remove the key.
  8.  
  9. Attach the two way connector at the base of the steering column and the Connector Position Assurance (CPA).
  10.  
  11. Install the steering column filler panel or knee bolster.
  12.  
  13. Install the AIR BAG fuse to the fuse block.
  14.  
  15. Connect the negative battery cable.
  16.  
  17. From the passenger seat, turn the ignition switch to RUN and make sure that the AIR BAG warning lamp flashes seven times and then shuts off. If the warning lamp does not shut off, make sure that the wiring is properly connected. If the light remains on, take the vehicle to a reputable repair facility for service.
  18.  

 
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