What Does B1992 Mean?
This code indicates that the Airbag Control Module (ACM) has detected a short circuit to battery voltage (Vbatt) in the driver's side side-impact airbag (seat-mounted or door-mounted) circuit. The ACM continuously monitors airbag circuit resistance and voltage, and has detected an abnormal high voltage condition where the circuit is shorted directly to positive battery voltage instead of maintaining proper resistance values. This fault prevents the airbag system from functioning correctly and typically disables the affected airbag.
Safety Warning
The vehicle should not be driven as the driver's side airbag is disabled and will not deploy in a side-impact collision, significantly increasing injury risk. The airbag warning light will be illuminated, and immediate professional repair is required before operating the vehicle.
Common Causes
45%
Damaged or chafed wiring harness under driver seat causing short to power wire
30%
Failed side airbag module with internal short circuit to power
15%
Corroded or damaged airbag connector with pin-to-pin short
10%
Airbag Control Module internal fault causing false short detection
Diagnostic Steps
1
Step 1: Disconnect negative battery terminal and wait 10 minutes for airbag system capacitors to discharge. Visually inspect driver seat area, particularly under seat rails and mounting brackets, for damaged, pinched, or chafed wiring that could contact power sources
2
Step 2: Disconnect the driver side airbag connector (yellow connector under seat or in door). Using a digital multimeter, measure resistance between each airbag circuit pin and battery positive terminal - should read infinite resistance (open circuit). Any continuity indicates a short to Vbatt
3
Step 3: If no short found at connector, measure resistance across the airbag module terminals with module disconnected - should read 2-4 ohms typically. Reading of 0 ohms or erratic readings indicates failed airbag module
4
Step 4: Inspect airbag connector for corrosion, bent pins, moisture intrusion, or foreign debris causing cross-circuit contamination. Check connector locking mechanism for proper engagement
5
Step 5: If wiring and module test normal, substitute known-good Airbag Control Module or use factory scan tool to perform ACM self-test and circuit integrity checks to rule out false detection
6
Step 6: After repairs, reconnect all components, reconnect battery, clear codes, and perform airbag system self-test. Verify code does not return and airbag warning light extinguishes properly
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code indicates that the Airbag Control Module (ACM) has detected a short circuit to battery voltage (Vbatt) in the driver's side side-impact airbag (seat-mounted or door-mounted) circuit. The ACM continuously monitors airbag circuit resistance and voltage, and has detected an abnormal high volt...
The most common cause of B1992 (Driver Side, Side mount Airbag Circuit Short to Vbatt) is: Damaged or chafed wiring harness under driver seat causing short to power wire
Typical repair costs for B1992 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 as the driver's side airbag is disabled and will not deploy in a side-impact collision, significantly increasing injury risk. The airbag warning light will be illuminated, and immediate professional repair is required 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 B1992 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Airbag System
Difficulty
Type
Manufacturer
Recommended Tools
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