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Engine-Codes – Generic – B1788

B1788 Code - Rear Occupant Classification Sensor Right Collision Detection

Quick Answer

The B1788 code indicates a problem with the rear occupant classification sensor on the right side of the vehicle, specifically related to collision detection. Common causes include Sensor malfunction due to wear and tear, Water damage to the sensor, Electrical faults in the sensor circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1788 indicates Rear Occupant Classification Sensor Right Collision Detection.
Common causes
Common causes include Sensor malfunction due to wear and tear, Water damage to the sensor, Electrical faults in the sensor circuit.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B1788 Description

The B1788 code indicates a problem with the rear occupant classification sensor on the right side of the vehicle, specifically related to collision detection. This sensor is responsible for detecting the presence of passengers in the rear seats and determining their size and weight to deploy airbags appropriately in the event of a collision. When this code is triggered, it means that the sensor is not functioning correctly, which can compromise the safety features of the vehicle.

OBDII Code B1788 - Rear Occupant Classification Sensor Right Collision Detection
B1788 Code - Rear Occupant Classification Sensor Right Collision Detection

Common Causes of B1788

  1. Sensor malfunction due to wear and tear.
  2. Water damage to the sensor.
  3. Electrical faults in the sensor circuit.
  4. Faulty airbag control module.
  5. Wiring issues in the sensor circuit.

Symptoms of B1788

  1. SRS (Supplemental Restraint System) warning light illuminated on the dashboard.
  2. Airbag system may not deploy in a collision.
  3. Inconsistent deployment of airbags in testing.
  4. Fault codes related to the rear occupant classification sensor.

How to Fix B1788

  1. Diagnose the specific cause of the issue using a diagnostic scanner to read the fault codes.
  2. Inspect the rear occupant classification sensor and wiring for any visible damage.
  3. Replace the faulty sensor or repair any wiring issues as needed.
  4. Clear the fault codes and reset the SRS system.
  5. Perform a test to ensure the rear occupant classification sensor is functioning properly.

Cost to Fix B1788

The cost of repairing a rear occupant classification sensor right collision detection issue can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair can range from $200 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $300 and $800. Keep in mind that these are rough estimates, and actual costs may vary based on the location, vehicle make and model, and the labor rates of the repair shop. It is recommended to get a personalized quote from a trusted auto repair shop before proceeding with the repairs.

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Code B1788 Information for Specific Makes

  • B1788 Lexus — Rear Occupant Classification Sensor Right Collision Detection
  • B1788 Scion — Rear Occupant Classification Sensor Right Collision Detection
  • B1788 Toyota — Rear Occupant Classification Sensor Right Collision Detection

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.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1788 Code

1. What does the OBDII code B1788 mean?

The B1788 code indicates a fault in the rear occupant classification sensor on the right side, specifically related to collision detection.

2. What are the common symptoms of the B1788 code?

Symptoms may include the airbag warning light being illuminated, improper airbag deployment functionality, or incorrect detection of rear seat occupants.

3. What causes the B1788 code to appear?

Common causes include damage to the rear occupant classification sensor, wiring issues, a faulty sensor module, or previous collision damage.

4. Can I drive with the B1788 code active?

While the vehicle may still be drivable, this code can affect airbag system performance, which could compromise safety in an accident.

5. How is the B1788 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the rear occupant classification sensor and its wiring, and check for any physical damage or loose connections.

6. How do you fix the B1788 code?

Repairs may involve replacing the faulty rear occupant classification sensor, repairing damaged wiring, or recalibrating the occupant classification system.

7. Can a reset clear the B1788 code?

Clearing the code without addressing the underlying issue will likely result in the code returning. Proper diagnosis and repair are necessary.

8. Does a past collision automatically trigger the B1788 code?

Not necessarily, but collision damage can affect the sensor or its wiring, leading to the code being stored.

9. Is the B1788 code specific to certain car brands?

This code is most commonly associated with vehicles using advanced airbag systems, but its specifics can vary by manufacturer.

10. How much does it cost to repair the B1788 code?

Repair costs vary depending on the issue, with sensor replacement typically costing $100-$300, plus labor fees.

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