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OBD-II · Body (B)

B0020

Left side airbag circuit fault

What it means

The airbag control unit has found a problem in the wiring circuit to the left side airbag (usually in the seat), so it may not deploy in a crash.

Symptoms

  • Airbag warning light on
  • Light may come and go when the seat is moved

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01loose or corroded yellow airbag connector under the front seat
02wiring pulled or chafed by seat movement or items under the seat
03seat removed or wiring disturbed during interior work
04faulty seat side airbag

What to check, step by step

  1. 01Read and record the SRS failure-type subcode
  2. 02Before touching SRS connectors, follow the OEM battery-disconnection and reserve-energy wait procedure
  3. 03Inspect the left front seat connector and harness for damage or tension; use only OEM-approved repair methods
  4. 04Do not measure resistance directly across the airbag inflator; an SRS-trained technician must follow the specified circuit test procedure
  5. 05For a seat-movement live-data test, first fully reassemble and secure the SRS wiring and restore power as specified; do not handle connectors during the powered test
  6. 06After repair, clear codes and verify the SRS self-test