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DTC codes / B00xx · Airbags, seats, doors, lights and comfort systems / B0088

B0088Third Row Right Seat Belt Load Limiter Deployment Control

B0088 indicates that the restraint control module (RCM) has detected a fault in the deployment circuit for the third-row right seat belt load limiter, which is a pyrotechnic device that manages belt force during a crash. The module monitors the circuit's resistance and continuity and sets this code when the signal falls outside the expected range, often due to an open or shorted connection.

SystemBody
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaAirbags, seats, doors, lights and comfort systems

Symptoms you may notice

  • The supplemental restraint system (SRS) warning light stays illuminated on the dashboard.
  • Often no symptoms besides the warning light, with no change in vehicle driveability.
  • The seat belt may not lock or retract as designed in a collision, compromising occupant protection.
  • Other airbag-related codes may be stored if the fault affects shared wiring or the RCM.
  • In some vehicles, a chime or message may appear reminding you to service the restraint system.

Common causes, most likely first

  1. Corroded, loose, or damaged electrical connector at the third-row right seat belt load limiter.
  2. Open or shorted wiring in the circuit between the RCM and the load limiter, often from pinched harnesses or chafing.
  3. Failed seat belt load limiter squib (the pyrotechnic element) due to age, moisture, or manufacturing defect.
  4. Internal fault in the restraint control module (RCM) causing false detection.
  5. Water intrusion or debris in the connector or seat belt assembly area.
  6. Improper previous repair or aftermarket accessory installation disturbing the SRS wiring.

How to diagnose and fix it

  1. Inspect the third-row right seat belt assembly and its connector for corrosion, damage, or loose pins; clean or repair as needed.
  2. Disconnect the battery and wait for the SRS capacitor to discharge, then check the resistance of the load limiter squib with a digital multimeter (DMM) and compare to specification.
  3. Perform a wiggle test on the harness while monitoring resistance to identify intermittent opens or shorts.
  4. Check for continuity and short-to-ground or short-to-voltage on the wiring between the RCM and the load limiter, repairing any damaged wires.
  5. If the squib resistance is out of range, replace the seat belt load limiter assembly (the entire seat belt retractor may be required).
  6. Clear the code and verify the repair by cycling the ignition and confirming the SRS light goes out; if the code returns, suspect the RCM.
  7. If all external circuits test good, follow the manufacturer's diagnostic flow to test or replace the RCM.

Before you replace the seat belt assembly

  • A common oversight is failing to disconnect the battery and wait for the SRS capacitor to discharge before working on the circuit, which can cause accidental airbag deployment and serious injury.
  • The code often sets due to a poor connection at the connector under the third-row seat, not a failed load limiter, so always inspect and clean terminals first.
  • Resistance measurements must be taken with the squib disconnected from the RCM to avoid damaging the meter or the module, and the specified resistance is typically very low (a few ohms).
  • Aftermarket seat covers or cargo that presses on the seat belt mechanism can damage wiring or the connector, leading to this code.
  • A faulty RCM is rare; misdiagnosis often leads to unnecessary replacement when the real issue is a chafed wire behind trim panels.

Can I keep driving with B0088?

The vehicle remains driveable, but the SRS may not deploy the third-row right load limiter in a crash, reducing occupant protection. Avoid carrying passengers in that seat until the fault is repaired, and have the system diagnosed promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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