B0025: Left Side Deployment Stage 2 Control

What it means

A fault is detected in the deployment control for the second stage of the left side airbag, used in vehicles with two-stage side restraint systems.

How it works

Some left-side airbags use two deployment stages; this code concerns the second stage, which provides additional inflation when crash conditions require it. The restraint control module monitors the stage 2 squib circuit and sets B0025 when it detects a fault, such as a problem at a corroded connector; read the SRS subfault for the exact condition.

Common causes

Most likely first.

1. Stage 2 squib circuit fault
2. Corroded connector

Symptoms

• Airbag warning light on

How to diagnose it

1. Read the SRS subfault and freeze-frame data to confirm that the fault is specific to the left-side airbag stage 2 loop.
2. With the system disabled according to the manufacturer’s instructions, inspect the left-side stage 2 connector and nearby harness for corrosion, looseness, or damage.
3. Check the wiring route for abrasion or pinching and inspect terminals at the airbag module and restraint control module.
4. Use the manufacturer-approved method to test the stage 2 circuit and connector; do not measure the inflator directly with a standard multimeter.
5. If the loop and connectors pass, follow the service diagnostic process to evaluate the left-side airbag module and restraint control module.

Common fixes

• Clean or replace a corroded stage 2 connector only as permitted by the SRS repair procedure.
• Repair damaged left-side stage 2 wiring or terminals.
• Correct an open or short in the stage 2 deployment circuit identified by the subfault diagnosis.
• Replace the airbag module or restraint control module only after the manufacturer’s tests confirm the fault.

Can I keep driving?

The left-side airbag’s second stage may be unavailable, reducing the protection available in a more severe side impact. Get the SRS fault diagnosed promptly and do not disturb the airbag wiring.