Driver Side Sensor 1 Circuit Low
The computer sees a low signal from the driver-side airbag sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The airbag system is not getting the expected voltage from the driver-side sensor, which should normally see 0.5 to 4.5 volts depending on the condition. Instead, it's seeing something much lower, like less than 0.1 volts.
What the computer is actually seeing
The computer monitors the airbag sensor signal voltage. In this case, it's detecting a voltage that is significantly below the expected range, indicating a problem in the circuit.
What a healthy reading looks like
Expected voltage is between 0.5V and 4.5V. Anything below 0.1V is a fault condition.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the condition of the wiring and connectors for corrosion or damage between the airbag sensor and the module. Isolate and address any visible issues?
- 2Measure the voltage at the driver-side airbag sensor. Is it within the expected 0.5V to 4.5V range? If not, proceed.
- 3Disconnect the sensor and measure the resistance of the circuit. Is it within specs (usually should be close to zero for a good circuit)? If it's open or very high, repair the circuit.
- 4Replace the driver-side airbag sensor if the circuit is good but the sensor voltage is still low after reconnecting.
Common causes
- Wire damage or corrosion in the airbag sensor circuit
- Faulty driver-side airbag sensor
- Bad ground connection
- Connector issues or poor contact at the sensor or module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Driving is possible, but airbags may not deploy in an accident, increasing risk.
Will this code come back after a repair?
If the circuit and sensor are properly fixed, the code should not return.
Why might this code pair with B1640?
B1640 indicates a fault in the passenger airbag sensor circuit, which may share wiring or related issues.
Working a real vehicle right now?
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