What Does B1994 Mean?
This code indicates the airbag control module (ACM/SRS) has detected an open circuit in the driver's side-mounted side airbag deployment circuit. An open circuit means there is a break in electrical continuity between the airbag control module and the side airbag squib/inflator, preventing proper airbag deployment if needed. This compromises the supplemental restraint system's ability to protect the driver in a side-impact collision.
Safety Warning
Not safe to drive as the driver side airbag will not deploy in a side-impact collision, significantly increasing injury risk. This is a critical safety system failure requiring immediate professional repair before operating the vehicle.
Common Causes
45%
Damaged or disconnected wiring harness under driver seat or in B-pillar due to seat movement, corrosion, or chafing
30%
Faulty or corroded connector at side airbag module inside seat back or side bolster
15%
Failed driver side-mounted airbag module or squib internal circuit failure
10%
Faulty airbag control module or internal circuit board failure
Diagnostic Steps
1
Step 1: Disconnect battery negative terminal and wait 10+ minutes for airbag capacitor discharge. Visually inspect driver seat area, B-pillar trim, and under-seat wiring for obvious damage, disconnected connectors, or chafing against seat rails
2
Step 2: Using a multimeter set to resistance mode, check continuity of the side airbag circuit from the ACM connector to the seat-mounted airbag connector. Proper resistance should be 2-5 ohms through the squib (consult manufacturer specifications). Infinite resistance confirms open circuit
3
Step 3: If open circuit confirmed, disconnect connectors at both ends and inspect terminals for corrosion, bent pins, or damage. Clean with electrical contact cleaner and check harness continuity wire-by-wire between ACM and airbag module
4
Step 4: If wiring and connectors are intact, perform resistance test directly at side airbag module connector. If out-of-spec or open, replace airbag module. If within spec, suspect ACM failure
5
Step 5: After repair, reconnect all components, reconnect battery, clear codes, and verify airbag warning light extinguishes. Perform system self-test using scan tool to confirm proper circuit operation and no stored faults
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code indicates the airbag control module (ACM/SRS) has detected an open circuit in the driver's side-mounted side airbag deployment circuit. An open circuit means there is a break in electrical continuity between the airbag control module and the side airbag squib/inflator, preventing proper ai...
The most common cause of B1994 (Driver Sid, Side mount Airbag Circuit Open) is: Damaged or disconnected wiring harness under driver seat or in B-pillar due to seat movement, corrosion, or chafing
Typical repair costs for B1994 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not safe to drive as the driver side airbag will not deploy in a side-impact collision, significantly increasing injury risk. This is a critical safety system failure requiring immediate professional repair before operating the vehicle.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1994 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
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