OEM Restraints System Part Replacement Search


2021 Cadillac CT4

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DISABLE PROCEDURE AND TIME (Always Check Service Manual)

1. Turn the steering wheel so that the vehicles wheels are pointing straight ahead.
2. Vehicle OFF.
Warning: 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 Restraints Control Module.
4. Wait 2minutes before working on the system.

REV: 01/2021

PARTS THAT MUST BE REPLACED FOLLOWING A DEPLOYMENT

Accident With Frontal Air Bag Deployment – Component Replacement:

• Driver steering wheel air bag [AIRBAG,STEERING WHEEL; AIRBAG,KNEE BOLSTER], if deployed
• Steering Column
• Passenger instrument panel air bag [AIRBAG,INSTRUMENT PNL; AIRBAG,KNEE BOLSTER], if deployed
• Restraints Control Module (RCM), if module has set DTC B1A33 and will not clear [MODULE,AIRBAG CONTROL]
• Front and/or side impact sensors [AIRBAG SENSOR,FRONT; AIRBAG SENSOR,FRT DOOR; AIRBAG SENSOR,SIDE]
• Driver/Passenger seat side air bag, [AIRBAG,FRONT SEAT] if deployed
• Seat back cover if Side Seat Air Bag is deployed
• Driver/Passenger Seat Belt Anchor and/or Retractor Pretensioners
• Roof rail Airbags, if deployed [AIRBAG,ROOF]
• Replace any seat belt system that was in use during the collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners.

Accident With Side Seat Air Bag Deployment – Component Replacement:

•Steering Column
• Left/right side impact sensors on the side of the impact [AIRBAG SENSOR,FRT DOOR; AIRBAG SENSOR,SIDE]
• Left/right roof rail air bag on the side of the impact [AIRBAG,ROOF]
• IRestraints Control Module (RCM), if module has set DTC B1A33 and will not clear [MODULE,AIRBAG CONTROL]
• Inflatable Restraint Seat Belt Anchor and/or Retractor Pretensioner.
• Driver or passenger seat back cushion cover replacement
• Replace any seat belt system that was in use during a collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners. Always replace the entire seat belt system with the buckle, guide and retractor assembly, which includes the latch and webbing material.

Accident With Seat Belt Pretensioner Deployment Only – Component Replacement:

• Driver and Passenger Inflatable restraint seat belt anchor pretensioner and/or retractor pretensioner
• Restraints Control Module (RCM), if module has set DTC B1A33 and will not clear [MODULE,AIRBAG CONTROL]
• Replace any seat belt system that was in use during a collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners. Always replace the entire seat belt system with the buckle, guide and retractor assembly, which includes the latch and webbing material.

Replace any seat belt system that was in use during a collision serious enough to deploy any automatic restraint device such as air bags and seat belt pretensioners. This not only includes seat belt systems in use by people of adult size, but seat belt systems used to secure child restraints, infant carriers and booster seats, including LATCH system and top tether anchorages. Always replace the entire seat belt system with the buckle, guide and retractor assembly, which includes the latch and webbing material.

Do NOT replace single seat belt system components in vehicles that have been in a collision as described above. Always replace the entire seat belt system with the buckle, guide
and retractor assembly, which includes the latch and webbing material.

PARTS THAT MUST BE INSPECTED AND REPLACED IF DAMAGED

After any collision, inspect the following components as indicated. If you detect any damage, replace the component. If you detect any damage to the mounting points or mounting hardware, repair the component or replace the hardware as needed:

• The steering column--Inspect the steering column for bending, twisting, buckling or any type of damage.
• The instrument panel knee bolsters and mounting points--Inspect the knee bolsters for bending, twisting, buckling, or any other type of damage.
• The instrument panel brackets, braces, etc.--Inspect for bending, twisting, buckling, or any other type of damage.
• The seat belts--Perform the seat belt operational and functional checks.
• The instrument panel cross car beam--Inspect for bending, twisting, buckling, or any other type of damage.
• The instrument panel mounting points and brackets--Inspect for bending, twisting, buckling, or any other type of damage.
• The seats and seat mounting points--Inspect for bending, twisting, buckling, or any other type of damage.
• The roof and headliner mounting points.
• The brake pedal -• Inspect the brake pedal for bending, twisting, buckling or any type of damage

Accident With Frontal Air Bag Deployment – Component Inspections:

• Steering wheel air bag coil and the coil wiring pigtail--Inspect for melting, scorching, or other damage due to excessive heat.
• Mounting points or mounting hardware for the passenger instrument panel air bag, steering wheel air bag, Inflatable Restraint Sensing and Diagnostic Module, seat side
air bag (if deployed) and seat belt anchor and/or retractor pretensioners—Inspect for any damage and repair or replace each component as needed.

Accident With Side Seat Air Bag Deployment – Component Inspections:

• Mounting points or mounting hardware for the side impact sensors, and driver/passenger side seat air bags on the side of impact—Inspect for any damage and repair or replace each component as needed.
• Mounting points, mounting hardware, headliner and trim pieces for the left/right roof rail air bag on the side of impact—Inspect for any damage and repair or replace each
component as needed.
• Mounting points or mounting hardware for the Inflatable Restraint Sensing and Diagnostic Module and seat belt anchor and/or retractor pretensioners—Inspect for any
damage and repair or replace each component as needed.
• The seat cushion frame
• The seat recliner and cover, if equipped
• The seat adjuster
• The seat back frame
• Door trim assembly
• Impacted seat cushion side covers and switches
• The rear seat side bolster, attachments, brackets and wiring
• The rear seat back frame, cushion and cover
• The rear seat cushion frame, cushion and cover

Accident With Seat Belt Pretensioner Deployment Only – Component Inspections:

• Mounting points or mounting hardware for the Inflatable Restraint Sensing and Diagnostic Module
• Mounting points or mounting hardware for the Seat Belt Anchor Pretensioners
• Mounting points or mounting hardware for the Seat Belt Retractor Pretensioners

Sensor Replacement Guidelines:
The SIR/side air bag sensor replacement policy requires replacing sensors in the area of accident damage. The area of accident damage is defined as the portion of the vehicle which is crushed, bent, or damaged due to a collision.

Additional Information


*This matrix does not currently contain all production vehicles sold in the United States. Please refer back to this page frequently to ensure the most up-to-date information. The following charts were developed in cooperation with AudaExplore, a Solera company. The contents are based on the information available at the time of publication. To ensure that the most recent information is used, always refer to the vehicle maker's technical information before working with airbags and other passive restraint systems.


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