Engine-Codes - Generic - B1780

B1780 Code - Front Occupant Classification Sensor Left Circuit Malfunction

- Code Popularity: 5,478 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the Code B1780?

  • Faulty Separate Type Front Seat Cushion Spring Assembly Left (Front Occupant Classification Sensor Left)
  • Separate Type Front Seat Cushion Spring Assembly Left harness is open or shorted
  • Separate Type Front Seat Cushion Spring Assembly Left circuit poor electrical connection
  • Faulty Occupant Detection ECU

How to Fix the B1780 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

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What is the Cost to Diagnose the Code B1780?

Labor: 1.0

The cost to diagnose the B1780 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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What are Code B1780 Possible Symptoms?

  • Air Bag Warning Light ON

What Does the B1780 Code Mean?

The Front Occupant Classification Sensor Left (LH) circuit consists of the Occupant Detection ECU and the Front Occupant Classification Sensor Left. The Diagnostic Trouble Code (DTC) B1780 is recorded when a malfunction is detected in the Front Occupant Classification Sensor Left circuit.

B1780 Code - Front Occupant Classification Sensor Left Circuit Malfunction

Need more Information on the B1780 Code?

Need more information on how to fix the B1780 code? Get Access to Factory Service Manuals

Code B1780 Information for Specific Makes

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.
Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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