Wondering why your airbag light is on? You’re not alone. Seeing a glowing warning on your dashboard is never ideal, and since it involves your safety, it’s even more of a priority to fix. This light is a signal from your Supplemental Restraint System (SRS) — the complex ‘brain’ that manages your airbags and seatbelt pretensioners. When the light stays on, it means the system has detected a fault. In most vehicles, this means the airbags are disabled and will not deploy during a collision.

Often, the reason why an airbag light came on suddenly is due to a simple electronic glitch, but more frequently, it points to a mechanical wear-and-tear issue. One of the most common culprits is the clock spring, a critical component within your vehicle electrical system that bridges the gap between the moving steering wheel and the stationary column.

Common Causes: Why the SRS Light Activates

The SRS is a sensitive network, and a professional airbag system diagnosis can reveal several potential failure points.

Before you assume the worst, it’s worth considering these five common causes:

Depleted Car Battery

At the heart of every vehicle electrical system is the primary car battery, which also charges the backup batteries that provide the airbags with power. If your main battery has been struggling to start the car lately, it may have depleted the backup power source for your airbags. Sometimes, simply charging the main battery will clear the light; other times, the backup battery itself may need a separate charge or replacement.

Worn-Out Airbag Clock Spring

If you notice the airbag light after turning the steering wheel, you are likely dealing with a bad clock spring airbag light. The clock spring is a spiral cable that allows the steering wheel to spin while maintaining a constant electrical connection. Over time, the internal wires wear out from the friction of turning. Bad clock spring symptoms often manifest as intermittent flickers when you take a sharp corner, but eventually become a permanent warning light until it is fixed. For those curious about the technical stuff, you can learn more about exactly what happens when a clock spring fails.

Wet or Damaged Airbag Module

If your car has suffered from flood damage or even a significant interior spill, moisture can seep into the SRS control module. A wet airbag module can short-circuit, which could be why an airbag light came on suddenly without any accompanying mechanical symptoms. If there's been water ingress, the module almost always needs to be replaced to ensure the system is functioning properly.

Airbag Sensor Fault

Modern cars are chock-full of impact sensors in the bumpers, doors, and chassis. An airbag sensor fault can occur if a sensor is bumped or corroded by road salt, or even if the wiring is damaged by a rodent. Because these sensors alert the ECU to a potential collision, the system will trigger a warning light the moment it loses communication with any single one of them.

Seatbelt Issues

Don’t forget, it’s the airbag and seatbelt pretensioner warning light, so the cause might not be related to your airbag at all. If the potential causes above don’t help you find the source of your dashboard light, take a look at your seatbelts.

Airbag Light After Repair

No one wants to see an airbag light after repair work, but it’s surprisingly common if the work isn't done correctly. For example, if you’ve recently had steering parts serviced or your dashboard removed, a connector might not have been seated properly afterwards. Even a slight airbag sensor fault caused by a loose wire or a bumped impact sensor will trigger the light, as the ECU performs a "handshake" with every component every time you start the car. It’s best to go back to the workshop ASAP to get to the bottom of why your airbag light is on.

Airbag System Diagnosis: Spotting Faulty Clock Spring Symptoms

So, how do you know if the clock spring is the specific problem? Beyond the dashboard light, there are specific faulty clock spring symptoms to watch for. Since the clock spring powers everything on your wheel, a failure usually affects more than just the SRS.

When performing an airbag system diagnosis, look for these clock spring failure signs:

• Lost Steering Functions: If your horn has stopped working or your steering wheel radio controls are unresponsive, it probably means that the internal ribbon has snapped.
• Steering Wheel Airbag Wiring Noise: A faint clicking or rubbing sound from behind the wheel when you turn is a classic indicator of a ribbon cable bunching up.
• The Intermittent Light: If the light turns off when the wheel is straight but pops up when you full-lock, it indicates an issue with the steering wheel airbag wiring.

Is it Safe to Drive with the Airbag Light On?

Pressed for time or money, and asking yourself: is it safe to drive with the airbag light on? We strongly advise against it, because while the car is physically drivable, your primary safety net is gone. When the SRS light is active, the computer often disables the entire system to prevent an accidental deployment. This means in an accident, your airbags likely won't fire. You should book a service immediately to minimise risk. After all, airbags are proven to save lives, so why take the risk of delay?

How much does it cost to fix the airbag light?

Clock spring replacement cost varies depending on your vehicle make and model, but sourcing aftermarket parts can save you hundreds over dealer prices. If the issue is a simple loose connector, the cost is minimal. However, if you need a new spiral cable or sensor, you'll be looking at the cost of the part plus an hour or two of labour.

Can I fix the airbag light myself?

While a DIYer can perform basic checks — like looking for loose plugs under the seats — working on the steering wheel airbag wiring can be a high-risk job. Airbags contain small explosive charges called squibs. If you aren't comfortable with the strict battery-disconnection and capacitor-discharge procedures required for SRS work, this is a job best left to a qualified technician. A technician is also skilled at understanding fault codes and applying best practices to resolve them, so you can get back on the road sooner.

Why Source Your Replacement Parts From Machter?

Machter has been supporting the Aussie automotive community for over 10 years, providing high-quality aftermarket solutions that don't carry the "dealer-only" price tag.

• Specialist Range: We carry a massive selection of clock springs for thousands of models.
• Guaranteed Fitment: Use our "Find My Vehicle" tool to ensure your replacement matches your OEM specs perfectly.
• Reliability: Every part is backed by a local warranty and fair prices.
• Fast Delivery: We offer fast delivery Australia-wide, because we know your safety can't wait.

Getting Back on the Road Safely

Understanding why your airbag light is on is the first step toward restoring your car’s safety. Whether you’ve noticed the airbag light after turning the steering wheel, after repair, or it just came on suddenly, don't just brush it off.

By checking for other clock spring failure signs — like a dead horn or faulty wheel buttons — you can narrow down the issue before heading to the shop. Once you have an idea of your airbag system diagnosis, Machter is he