Engine-Codes - Lexus - B1786 Lexus

B1786 Lexus Code - Front Occupant Classification Sensor Right Collision Detection

- Code Popularity: 1,073 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC B1786 Lexus?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Front Seat RH (Front Occupant Classification Sensor (RH))
  • Front Seat RH harness is open or shorted
  • Front Seat RH circuit poor electrical connection
  • Faulty Occupant Classification ECU
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How to Fix the DTC B1786 Lexus?

Check 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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the B1786 Lexus code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Air Bag Warning Light ON

What Does the B1786 Lexus Code Mean?

The Diagnostic Trouble Code (DTC) B1786 is output when the Occupant Classification ECU receives a collision detection signal sent by the Front Occupant Classification Sensor Right (RH) when an accident occurs. DTC B1786 is also output when the Front Seat Assembly RH is subjected to a strong impact, even if an actual accident does not occur. However, when the Occupant Classification ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1786 can be cleared by performing the zero point calibration and sensitivity check. Therefore, when DTC B1786 is output, first perform the zero point calibration and sensitivity check.

B1786 Lexus Code - Front Occupant Classification Sensor Right Collision Detection

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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.