CAB Curtain Air Bag: Meaning, Symptoms, and Diagnosis
CAB Curtain Air Bag refers to the Curtain Air Bag, also known as the Side Curtain Airbag. It is part of the SRS (Supplemental Restraint System) and is designed to protect the head and upper body of occupants during side collisions and rollover accidents.
What Is a Curtain Air Bag (CAB)?
The Curtain Air Bag is installed inside the roof area above the side windows. During a serious side impact, the SRS control module activates the airbag to create a protective barrier between occupants and the vehicle structure or glass.
Location of Curtain Air Bag
- Inside the roof rail area
- Above the side windows
- Along the A-pillar, B-pillar, and C-pillar depending on vehicle design
Common Symptoms of Curtain Air Bag Fault
- SRS or Airbag warning light stays ON
- Airbag fault message appears on the dashboard
- Stored B-code diagnostic trouble codes
- Communication fault with SRS module
- Curtain airbag system disabled
Common Causes of Failure
- Open circuit in curtain airbag wiring
- Damaged connectors
- High resistance in deployment circuit
- Faulty side impact sensor
- SRS control module problem
- Previous airbag deployment
How to Diagnose Curtain Air Bag Fault?
Curtain airbag problems are diagnosed using an SRS-compatible diagnostic scanner. The scanner communicates with the airbag control module and identifies the affected circuit.
Impact Sensors
↓
SRS Control Module
↓
Curtain Air Bag Circuit
↓
Diagnostic Scanner
↓
Fault Code Identification
Important Note About Abbreviations
Automotive abbreviations are not always standard. The same abbreviation may have different meanings depending on the manufacturer, vehicle model, or diagnostic software. Some scan tools may display CAB as Curtain Air Bag, while other systems may use different names.
Always confirm the correct meaning through a professional diagnostic scanner or manufacturer service information before replacing any component.
Safety Warning
Curtain airbags contain explosive inflators. Never test the airbag circuit by applying external power or using incorrect testing methods. Always follow the manufacturer's safety procedures when working on SRS systems.
FAQ
Is CAB Curtain Air Bag the same as SRS?
No. SRS is the complete safety system, while the Curtain Air Bag is one component inside that system.
Can a Curtain Air Bag fault turn on the airbag light?
Yes. Any problem in the curtain airbag circuit can activate the SRS warning light.
Can all OBD scanners diagnose Curtain Air Bag faults?
No. Basic OBD scanners usually read engine codes only. An SRS-capable scanner is required for airbag diagnostics.