B1378 Driver side airbag circuit resistance too high (Suzuki, Kia)

Driver side airbag resistance too high

B1378 in short

On Suzuki and Kia, B1378 means the airbag computer measured too much resistance in the driver side (seat-mounted) airbag circuit. The airbag light comes on and that side airbag may not deploy. Bulletins and dealers point to connectors, and sometimes the seatback airbag. Have it checked soon; never probe airbag wiring yourself.

The airbag computer checks the resistance of each airbag firing circuit every time the car starts. B1378 means the driver side airbag circuit, the one in the seat on these models, reads higher than it should, so the airbag light comes on.

Suzuki's bulletin for the 2005–2006 Forenza and Reno pairs B1378 (driver side) with B1382 (passenger side). Kia covers the same pair on the 2001–2005 Optima and, under warranty extension WTY025, on the 2017–2018 Sedona, where front seat side airbag connector resistance is higher than normal; Kia also published a B1378 FAQ for the Optima.

B1378 also appears on Hyundai and Genesis vehicles, but we did not find enough sources to state its meaning there, so this page speaks for Suzuki and Kia.

Pick your make

B1378 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Poor connection in the side airbag circuit (seat or module connector)

    Supported by vehicle data
    Why it ranks here
    Kia's WTY025 bulletin names higher-than-normal side airbag connector resistance, and a Suzuki dealer readout quoted in a complaint found a loose connector at the airbag module.
    What would change this
    Rises if the light came on after seat work. Falls if the connectors check good.

  2. Driver seatback side airbag assembly

    Possible — needs testing
    Why it ranks here
    One Kia dealer readout quoted in a complaint recommended replacing the driver seatback for B1378; a single report, so it needs testing.
    What would change this
    Rises if the connectors check good and the resistance is high at the airbag itself. Falls if a connector repair clears the code.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Have the airbag codes read with a scan tool that can talk to the airbag module, and note every code stored.

    Low riskTool: scan tool with airbag (SRS) access

    • IfB1378 is stored, with or without B1382

      It meansThe driver side airbag circuit reads high resistance.

      Go to step 2

    • IfOther airbag codes are stored as well

      It meansA technician should work through them in the order the service manual gives.

      Go to step 3

  2. Give your VIN to the dealer and ask whether a side airbag bulletin or warranty extension (such as Kia WTY025) covers the car.

    Low risk

    • IfCovered

      It meansThe dealer repairs it under the bulletin.

      Go to step 3

    • IfNot covered

      It meansThe circuit still needs a diagnosis.

      Go to step 3

  3. Have a dealer or trained technician run the airbag system diagnosis from the service manual.

    Best left to a shopTool: maker's diagnostic tool

    Warning:Never probe airbag connectors or wiring with a test light or meter, and never unplug them yourself. Nissan warns that airbags and pretensioners can still deploy after the ignition is off, and that test equipment must not be used on airbag circuits unless the service manual calls for it. Leave this to a dealer or trained technician.

Symptoms

  • Airbag warning light stays on after the engine starts

How to fix

This is a safety-critical system, so we explain the code but don't give repair steps. Have it inspected by a qualified technician.

Parts and cost context

  • Driver seat side airbag connector / seatback side airbag:Kia extended coverage on some Sedonas (WTY025); ask before paying. Dealer or trained-technician work. Labour varies; get a quote.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Suzuki

  • 2005–2007 · Forenza

    Supported by vehicle data

    Suzuki's bulletin covers 2005–2006 models; a 2007 owner reports a dealer finding a loose connector at the airbag module. Whether the bulletin is still current is not verified.

  • 2005–2006 · Reno

    Supported by vehicle data

    Suzuki's bulletin covers B1378 with B1382. Whether it is still current is not verified.

  • TS 05 01158Status unverified

    Airbag light on, B1378 and/or B1382

    2005–2006forenza, reno · issued · NHTSA 10024195

    Driver side (B1378) and/or passenger side (B1382) airbag resistance too high.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Kia

  • 2017–2018 · Sedona

    Supported by vehicle data

    Kia's WTY025 warranty extension covers the front seat side airbag connector. Whether it is still current is not verified.

  • 2001–2005 · Optima

    Supported by vehicle data

    Kia's bulletins cover B1378 on the Optima. Whether they are still current is not verified.

  • ELE259Status unverified

    Side airbag warning light on with B1378/B1382 (WTY025)

    2017–2018sedona · issued · NHTSA 10217680

    Warranty extension to diagnose and repair the side airbag light; front seat side airbag connector resistance higher than normal.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 035Status unverified

    SRS warning lamp for B1378 and B1382

    2001–2005optima · issued · NHTSA 10022959

    SRS warning lamp illumination with B1378 and B1382.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • B1382Passenger side airbag circuit resistance too high (Suzuki, Hyundai, Kia)

    Shares causes Supported by vehicle data

    B1382 is the passenger side version; Suzuki and Kia bulletins cover the two codes together.

All Airbags and seat-belt restraints (SRS) codes

Sources and review

  1. 2023 Accord Owner's Manual: Airbag System Indicators — American Honda Motor Co.
  2. Camry Owner's Manual (OM06291U) — Toyota
  3. Suzuki TS 05 01158: airbag light on, DTC B1378 (driver side airbag resistance too high) and/or B1382 (passenger side airbag resistance too high) — American Suzuki Motor Corp. ,
  4. Kia TSB ELE259: side airbag warning light on with DTC(s) B1378/B1382 (WTY025 warranty extension) — Kia America ,
  5. NHTSA complaint ODI 10237761 (2007 Suzuki Forenza) — NHTSA Office of Defects Investigation
  6. NHTSA complaint ODI 10248016 (2004 Kia Optima) — NHTSA Office of Defects Investigation
  7. Kia TSB 035: SRS warning lamp illumination for B1378 and B1382 — Kia Motors America ,
  8. Nissan Supplemental Restraint Systems: damage analysis and repair using Diagnostic Trouble Codes (TechNews, Summer 2016) — Nissan North America ,
  9. NHTSA complaint ODI 10659109 (2006 Suzuki Reno) — NHTSA Office of Defects Investigation
  10. Kia TSB 85: DTC B1378 driver's side airbag, frequently asked questions (Optima) — Kia Motors America ,
  11. NHTSA complaint ODI 10749893 (2009 Kia Spectra) — NHTSA Office of Defects Investigation
Last reviewed
Written by
Saurabh K.
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