What Does B1919 Mean?
This diagnostic trouble code indicates that the airbag control module has detected an unintended voltage (battery voltage) present on the memory clear circuit. This circuit is used to erase stored crash data and fault codes from the airbag module. The short to battery condition means the circuit is receiving 12+ volts when it should normally be at ground or low voltage, which could prevent proper airbag system operation or cause unintended memory clearing.
Safety Warning
This is a critical safety issue as it may prevent airbags from deploying properly in a collision or cause unintended airbag deployment. The vehicle should not be driven until the fault is diagnosed and repaired by a qualified technician with proper airbag handling procedures.
Common Causes
40%
Damaged or chafed wiring harness causing the memory clear circuit to contact a constant power source
30%
Faulty airbag control module with internal short circuit on the memory clear input
20%
Corroded or damaged connector at the airbag control module allowing cross-circuit contamination
10%
Improper previous repair or aftermarket installation connecting wrong wires together
Diagnostic Steps
1
Step 1: Disconnect the negative battery cable and wait 10 minutes for airbag system capacitors to discharge. Visually inspect the airbag control module connector and wiring harness for signs of damage, corrosion, water intrusion, or chafing against sharp edges.
2
Step 2: Using a digital multimeter, backprobe or measure the memory clear circuit wire at the airbag control module connector (module disconnected) to verify if battery voltage (12+ volts) is present when it should be at 0 volts or floating.
3
Step 3: If battery voltage is confirmed, trace the memory clear circuit wiring from the module connector toward the diagnostic connector or scan tool interface, inspecting for shorts to power wires, damaged insulation, or pinched harness locations.
4
Step 4: Check the airbag control module connector terminals for bent pins, corrosion, or evidence of terminal-to-terminal contact that could create an internal connector short to an adjacent power circuit.
5
Step 5: If no external wiring faults are found, test the airbag control module by substituting a known-good unit or performing resistance checks per manufacturer specifications to determine if the module has an internal fault.
6
Step 6: After repairs, reconnect all components, clear the fault codes, perform an airbag system self-test, and verify the code does not return. Test the memory clear function if applicable per service procedures.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the airbag control module has detected an unintended voltage (battery voltage) present on the memory clear circuit. This circuit is used to erase stored crash data and fault codes from the airbag module. The short to battery condition means the circuit is ...
The most common cause of B1919 (Air Bag Memory Clear Circuit Short To Battery) is: Damaged or chafed wiring harness causing the memory clear circuit to contact a constant power source
Typical repair costs for B1919 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 it may prevent airbags from deploying properly in a collision or cause unintended airbag deployment. The vehicle should not be driven until the fault is diagnosed and repaired by a qualified technician with proper airbag handling procedures.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1919 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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