What Does B1933 Mean?
This code indicates the airbag control module has detected an open circuit in the passenger-side airbag deployment system. An open circuit means electrical continuity has been lost somewhere between the airbag module and the passenger airbag inflator, preventing proper communication or deployment capability. The airbag warning light will illuminate and the passenger airbag system will be disabled until the fault is corrected.
Safety Warning
The vehicle should not be driven until this fault is repaired as the passenger airbag will not deploy in a collision, creating severe injury risk for front-seat passengers. This is a critical safety system failure requiring immediate professional attention.
Common Causes
35%
Damaged or disconnected passenger airbag connector under the seat or dashboard
25%
Faulty passenger airbag clockspring or spiral cable connection
20%
Broken or severed wiring in the passenger airbag circuit
15%
Failed passenger airbag inflator module
5%
Faulty airbag control module or internal circuit failure
Diagnostic Steps
1
Step 1: Disconnect the battery and wait 10 minutes to discharge the airbag system. Visually inspect the passenger airbag connector located under the passenger seat or behind the glove box for damage, corrosion, or disconnection.
2
Step 2: Using a digital multimeter set to resistance mode, measure continuity across the passenger airbag circuit from the airbag module connector to the control module harness connector (typically 2-5 ohms when connected). Check for infinite resistance indicating an open circuit.
3
Step 3: Inspect the airbag wiring harness along its routing path from the passenger seat/dashboard to the control module for signs of cuts, abrasion, pinching, or damage from previous repairs or accidents.
4
Step 4: If wiring and connectors are intact, test the passenger airbag inflator resistance directly at the component connector (typical values 2-3 ohms). Compare to manufacturer specifications to determine if the airbag module itself has failed internally.
5
Step 5: Check the clockspring assembly behind the steering wheel for continuity and proper operation if the vehicle has integrated passenger-side circuits through this component.
6
Step 6: After repairs, reconnect all components, reconnect battery, clear codes, and verify the airbag warning light extinguishes and no codes return. Perform a system self-test to confirm proper communication.
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code indicates the airbag control module has detected an open circuit in the passenger-side airbag deployment system. An open circuit means electrical continuity has been lost somewhere between the airbag module and the passenger airbag inflator, preventing proper communication or deployment ca...
The most common cause of B1933 (Air Bag Passenger Circuit Open) is: Damaged or disconnected passenger airbag connector under the seat or dashboard
Typical repair costs for B1933 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle should not be driven until this fault is repaired as the passenger airbag will not deploy in a collision, creating severe injury risk for front-seat passengers. This is a critical safety system failure requiring immediate professional attention.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1933 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Manufacturer
Recommended Tools
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