OBD Guide
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B1785

Front Occupant Classification Sensor Left Collision Detection

B1785 is an OBD-II diagnostic trouble code meaning: Front Occupant Classification Sensor Left Collision Detection. Common causes: passenger classification sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • Incorrect deployment of the airbag
  • Error in the diagnostic system

Causes

  • Passenger classification sensor malfunction
  • Open or short circuit in wiring harness
  • Problems with the airbag control module
  • Mechanical damage after an accident
  • Incorrect sensor calibration

How to Fix

  1. Diagnose the airbag system
  2. Check the integrity of the wiring harness
  3. Test the passenger classification sensor
  4. If necessary, replace the sensor or wiring harness
  5. Reflash or replace the airbag control module
  6. Calibrate the system

Related codes

B1780B1781B1782

FAQ

What does the B1785 code mean?

B1785 is an OBD-II diagnostic trouble code that indicates: Front Occupant Classification Sensor Left Collision Detection

What causes a B1785 error code?

The most common causes of B1785 include: Passenger classification sensor malfunction; Open or short circuit in wiring harness; Problems with the airbag control module; Mechanical damage after an accident.

How do I fix a B1785 diagnostic trouble code?

To fix B1785: Diagnose the airbag system. Check the integrity of the wiring harness. Test the passenger classification sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1785?

Do not drive — repair immediately

How much does it cost to fix B1785?

The estimated repair cost for B1785 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat