Airbags

B0030 — Second Row Left Side Airbag Deployment Circuit Fault

Severity: high Drive with care, to a shop

What B0030 means

The SRS control module tests the squib (igniter) circuit of the second row left airbag every time the ignition is turned on, checking for opens, shorts, and incorrect resistance. B0030 is set when the circuit falls outside the expected range. The usual culprits are damaged wiring, a bad connector under the seat, or the airbag module itself. While the fault is present, that airbag may not deploy in a crash.

Symptoms

  • Airbag/SRS warning light is on
  • Scan tool shows B0030
  • Other SRS codes may be stored
  • Problem started after a seat was removed or interior work was done
  • The airbag may not deploy in a crash

Possible causes

  1. Open or short in the second row left airbag circuit wiring
  2. Damaged seat harness or pinched wire under the seat
  3. Corroded, loose, or unlatched connector under the seat
  4. Faulty side airbag module in the seat or trim
  5. Faulty SRS control module or communication problem (less likely)
  6. Seat work done without disconnecting the battery

How to diagnose

  1. Read all SRS codes with a scan tool that supports airbags and note freeze frame data
  2. Ask whether the rear seat or interior was recently worked on
  3. Disconnect the battery and wait several minutes, following SRS safety procedures
  4. Inspect the harness and yellow connector under the left rear seat for latching, corrosion, breaks, and pinched wires
  5. Check the wiring for opens and shorts to ground or power with the squib disconnected, per the service manual
  6. Never probe a squib with an ordinary multimeter; use only manufacturer-approved methods
  7. Clear the code and see whether it returns
  8. Replace the airbag module if the circuit still fails, then retest

Common fixes

  • Repair or replace damaged wiring and connectors
  • Reseat and secure the connector, clean the terminals
  • Replace the second row left side airbag module
  • Replace or reprogram the SRS control module if it is confirmed faulty

Questions and answers

Is it safe to drive with B0030?

The car will run, but the second row left airbag may not deploy in a crash. Get it fixed as soon as you can.

Why did B0030 appear after removing a seat?

The airbag connector sits under the seat. If it was left unplugged or not latched, the module sees an open circuit. Check the connector and clear the code.

Can I just clear the code?

No. If the cause is not fixed, the code will come back. Find and repair the circuit fault first.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.