What Does B1918 Mean?
B1918 indicates the airbag control module has detected an open circuit in the memory clear function circuit. This circuit is responsible for allowing authorized clearing of stored airbag deployment data and fault codes after repairs or servicing. The open circuit prevents proper communication between the diagnostic interface and the airbag module's memory clear function, which may prevent proper system reset after collision events or repairs.
Common Causes
35%
Damaged or corroded wiring harness between diagnostic connector and airbag control module
30%
Faulty airbag control module with internal memory clear circuit failure
20%
Corroded or damaged diagnostic link connector (DLC) pins or internal circuits
15%
Blown fuse or open circuit in airbag module power supply affecting memory clear function
Diagnostic Steps
1
Step 1: Perform visual inspection of the diagnostic link connector (DLC) under the dashboard for bent, corroded, or pushed-back pins, particularly on pins 4, 5, and 16 which handle ground and power supply
2
Step 2: Using a digital multimeter, test continuity from DLC pins to the airbag control module connector, checking for open circuits or resistance above 5 ohms in the communication and power supply lines
3
Step 3: Inspect the airbag control module connector for corrosion, moisture intrusion, or damaged terminals, and verify proper seating of the connector with adequate retention force
4
Step 4: Check airbag system fuses and relays in the fuse panel, verify battery voltage at the airbag module power supply pin with ignition on (should read 12-14V)
5
Step 5: If all wiring and connections test normal, perform airbag module voltage drop test during attempted memory clear operation to identify internal module failure
6
Step 6: After repairs, attempt to clear airbag codes using scan tool memory clear function and verify B1918 does not return, then perform airbag system self-test to ensure full functionality
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
B1918 indicates the airbag control module has detected an open circuit in the memory clear function circuit. This circuit is responsible for allowing authorized clearing of stored airbag deployment data and fault codes after repairs or servicing. The open circuit prevents proper communication betwee...
The most common cause of B1918 (Air Bag Memory Clear Circuit Open) is: Damaged or corroded wiring harness between diagnostic connector and airbag control module
Typical repair costs for B1918 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive as airbags should still deploy in a collision, but the inability to clear memory may prevent proper system diagnostics and could mask other airbag faults. This code should be addressed promptly as it indicates a communication issue within a critical safety system that may affect post-collision serviceability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1918 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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