What Does B1926 Mean?
This code indicates that the airbag control module has detected an electrical fault in the passenger seat occupant classification system's pressure sensor circuit. The pressure switch monitors seat cushion deflection to determine if a passenger is present and their approximate weight, which determines airbag deployment strategy. The control module has identified an open circuit, short circuit, or abnormal voltage reading from this sensor that falls outside acceptable parameters.
Safety Warning
This is a critical safety issue as the passenger airbag may not deploy correctly or may deploy inappropriately based on incorrect occupant detection. The vehicle should not be driven with passengers until repaired, as the airbag system may malfunction during a collision.
Common Causes
45%
Faulty passenger seat pressure sensor/mat assembly with internal failure or degraded sensing elements
30%
Damaged or corroded wiring harness connector under passenger seat from moisture, debris, or seat movement wear
15%
Broken or chafed wires in harness under passenger seat from seat track movement or improper previous repairs
10%
Failed airbag control module with internal circuit board fault affecting pressure sensor input channel
Diagnostic Steps
1
Step 1: Perform visual inspection under passenger seat for obvious damage to wiring harness, connectors, or sensor mat. Check for water intrusion, corrosion, damaged connector pins, or chafed wires at seat track mounting points
2
Step 2: Disconnect passenger seat pressure sensor connector and inspect terminals for corrosion, bent pins, or moisture. Clean connector with electrical contact cleaner if contamination is present
3
Step 3: Using a digital multimeter, measure resistance across pressure sensor terminals with seat unoccupied (should typically read 1-5k ohms depending on manufacturer). Compare readings to factory specifications and test with weight applied to seat (resistance should change)
4
Step 4: Check continuity of all wires between pressure sensor connector and airbag control module connector using wiring diagram. Verify no shorts to ground or power, and resistance should be less than 5 ohms per circuit
5
Step 5: If sensor and wiring test good, measure voltage supply from airbag module to sensor (typically 5V reference). If voltage is absent or incorrect, suspect control module failure
6
Step 6: Clear codes, perform seat occupant classification system calibration procedure per manufacturer specifications, and verify proper airbag light operation and passenger airbag status indicator function
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
This code indicates that the airbag control module has detected an electrical fault in the passenger seat occupant classification system's pressure sensor circuit. The pressure switch monitors seat cushion deflection to determine if a passenger is present and their approximate weight, which determin...
The most common cause of B1926 (Air Bag Passenger Pressure Switch Circuit Failure) is: Faulty passenger seat pressure sensor/mat assembly with internal failure or degraded sensing elements
Typical repair costs for B1926 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a critical safety issue as the passenger airbag may not deploy correctly or may deploy inappropriately based on incorrect occupant detection. The vehicle should not be driven with passengers until repaired, as the airbag system may malfunction during a collision.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1926 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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