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AutoCodes - Generic - B1787

B1787 Code - Rear Occupant Classification Sensor Left Collision Detection

- Code Popularity: 5,025 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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By AutoCodes.com - Updated Oct 16, 2022
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|Code B1787 Possible Causes

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

|How do I Fix the Code B1787?

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's pins.

Does your Car have Safety Recalls? → Check here

|What is the Cost to Diagnose the Code B1787?

Labor: 1.0

The cost of diagnosing the B1787 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

|What are Code B1787 Possible Symptoms?

  • Air Bag Warning Light ON

|Code B1787 Description

The Diagnostic Trouble Code (DTC) B1787 is output when the Occupant Detection ECU receives a collision detection signal sent by the Rear Occupant Classification Sensor Left (LH) when an accident occurs. DTC B1787 is also stored when the separate type of front seat cushion spring assembly is subjected to a strong impact, even if an actual accident has not occurred. However, when the Occupant Detection ECU outputs a collision detection signal, even if the vehicle is not in a collision, DTC B1787 can be cleared by performing the zero point calibration and sensitivity check. Therefore, when DTC B1787 is output, first perform the zero point calibration and sensitivity check.

OBDII Code B1787 - Rear Occupant Classification Sensor Left Collision Detection - AutoCodes.com
B1787 Code - Rear Occupant Classification Sensor Left Collision Detection

|Need More Information on the B1787 Code?

Need more information on how to fix the B1787 code? Get Access to Factory Service Manuals

|Information for Specific Makes

  • B1787 Lexus Rear Occupant Classification Sensor Left Collision Detection  📷
  • B1787 Scion Rear Occupant Classification Sensor Left Collision Detection  📷
  • B1787 Toyota Rear Occupant Classification Sensor Left Collision Detection  📷

|Need Help with the B1787 Code?

Get the B1787 code diagnosed by a professional: Find a repair shop in your area

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.

|Code B1787 comments

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