What Does B1935 Mean?
This code indicates the airbag control module has detected abnormally low electrical resistance in the passenger side airbag inflator (squib) circuit. The squib is the pyrotechnic device that deploys the airbag, and low resistance suggests a short circuit, damaged wiring, or faulty inflator. This fault prevents the airbag system from functioning properly and typically illuminates the airbag warning light on the dashboard.
Safety Warning
The vehicle is NOT safe to drive as the passenger airbag will not deploy in a collision, creating severe injury risk for front passenger occupants. This is a critical safety system failure requiring immediate professional attention and the airbag warning light will remain illuminated.
Common Causes
35%
Damaged or chafed wiring harness between airbag control module and passenger airbag, causing short to ground or short between circuits
30%
Faulty passenger airbag inflator (squib) with internal short circuit or degraded resistance
20%
Corroded or moisture-damaged connector at passenger airbag or clock spring connection point
15%
Defective airbag control module misreading squib resistance or internal control module circuit failure
Diagnostic Steps
1
Step 1: Disconnect battery and wait minimum 10 minutes for airbag system capacitors to discharge. Visually inspect all visible passenger airbag wiring harness from control module to dashboard for signs of damage, chafing, pinching, or previous collision repair damage
2
Step 2: Using a digital multimeter in ohms mode, measure resistance of passenger airbag squib circuit at the airbag control module connector (harness side with airbag disconnected). Compare reading to manufacturer specifications, typically 2-3 ohms; significantly lower reading confirms low resistance fault
3
Step 3: Disconnect passenger airbag connector and inspect terminals for corrosion, moisture intrusion, bent pins, or discoloration. Measure resistance directly at passenger airbag inflator connector terminals; proper squib should read within 2-3 ohms typically
4
Step 4: If wiring and connectors test normal, perform resistance test from airbag control module connector to passenger airbag connector to isolate wiring harness integrity. Check for continuity to ground on each circuit wire separately
5
Step 5: If all wiring and squib resistance tests within specifications, suspect airbag control module fault. After repairs, reconnect battery, clear codes, and perform airbag system self-test verification to confirm repair
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
This code indicates the airbag control module has detected abnormally low electrical resistance in the passenger side airbag inflator (squib) circuit. The squib is the pyrotechnic device that deploys the airbag, and low resistance suggests a short circuit, damaged wiring, or faulty inflator. This fa...
The most common cause of B1935 (Air Bag Passenger Inflator Circuit Resistance Low on Squib) is: Damaged or chafed wiring harness between airbag control module and passenger airbag, causing short to ground or short between circuits
Typical repair costs for B1935 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is NOT safe to drive as the passenger airbag will not deploy in a collision, creating severe injury risk for front passenger occupants. This is a critical safety system failure requiring immediate professional attention and the airbag warning light will remain illuminated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1935 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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