Rick's Free Auto Repair Advice

Airbag light on Kia Spectra

Diagnose and fix airbag light on Kia Spectra

The airbag light comes on any time a connector or airbag component fails the preflight test as the engine is started. You can clear the code, but if the problem isn’t fixed, you’ll get an airbag light on Kia Spectra issue right away.

Airbag light on first step

Scan the trouble codes. Any time a warning light is on, there’s a trouble code stored in the computer. The trouble code will steer you in the direction of the fault. In the case of an airbag light on Kia Spectra issue, you may find codes B1448 occupant classification sensor defect and a B1378 side airbag front-driver resistance too high.

Airbag light on Step 2

Clear the codes. Then start the vehicle and scan again. If B1448 returns move on to the next step

Check voltage and ground on the occupant classification sensor

Power down the airbag system by disconnecting the battery negative terminal and let vehicle sit for at least 3-minutes without power. Unplug the occupant classification sensor three terminal connector. Reconnect battery. Check for battery voltage on the green/black wire at the terminal in the connector. Check for good ground on the black wire. Then check for continuity on the pink wire between the occupant classification connector and terminal 70 of the SRS control module (SRSCM) located in the console between the driver and passenger seat.

Check the side airbag connector

Power down the airbag system by disconnecting the battery negative terminal and let vehicle sit for at least 3-minutes without power. Unplug the connector to the side airbag driver’s side front.

The B1378 side airbag front-driver resistance too high sets if the side airbag resistance is 3.2Ω or more for more than 4-seconds. So the goal is to short across the side airbag terminals and repower the system to see if the trouble code changes to a shorted or low resistance code. Here’s how to do that:

The connector for the side airbag is under the seat. Disconnect it from the side airbag from the wiring harness. At the wiring harness, jumper from the gray/black wire terminal in the connector to the gray wire. Then connect the battery. Turn the key to RUN and clear the code. Turn the key off and then to RUN again. Scan the codes. If the short or low resistance code appears, the SRSCM and wiring harness are good. Power down again and let vehicle sit for at least 3-minutes without power.

Reconnect the side airbag connector to the wiring harness. If the airbag light stays off, the problem was a poor connection between the wiring harness and the side airbag. If the airbag lights comes on again with the same B1378 side airbag front-driver resistance too high, the airbag is defective.

©, 2018 Rick Muscoplat

Posted on by Rick Muscoplat

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