B0026: Left Side Deployment Stage 2 Loop Open

What it means

An open circuit is present in the second-stage deployment loop of the left side airbag.

How it works

The left-side airbag’s second deployment stage has its own electrical loop, monitored by the restraint control module. B0026 specifically indicates that this stage 2 loop is open, so the module cannot confirm a complete deployment circuit.

Common causes

Most likely first.

1. Open wiring under seat
2. Unseated airbag connector

Symptoms

• Airbag warning light on

How to diagnose it

1. Use an SRS-capable scan tool to confirm B0026 is current and review freeze-frame or event data for when the stage 2 open was detected.
2. Disable the SRS following the manufacturer’s procedure, then check that the left-side airbag connector is fully seated and its lock is intact.
3. Inspect the under-seat or other applicable harness route for a broken, stretched, or pinched wire that could leave the stage 2 loop open.
4. Use the manufacturer’s approved SRS continuity procedure to locate the open between the airbag connector and restraint control module; do not test the inflator directly with a regular meter.
5. If the wiring and connectors are intact, follow the service diagnostic tree to determine whether the airbag module or restraint control module has an internal fault.

Common fixes

• Reseat a displaced left-side stage 2 connector using the approved SRS disable and reconnect procedure.
• Repair a broken or pinched wire in the stage 2 loop according to manufacturer service information.
• Replace a damaged connector or terminal that is interrupting continuity.
• Replace the airbag module or restraint control module only if specified checks identify it as the source of the open.

Can I keep driving?

The left-side airbag’s second stage may not deploy while the loop is open, which can reduce protection in a side crash. Arrange prompt repair and avoid moving or working on the related seat or airbag harness.