Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ABS warning light
This is located on the instrument panel (dashboard) and is activated if the ABS system control module detects a fault in the ABS system. When the ignition is switched on or the engine starts, the control module switches the warning light on. The light then goes out after approx. 2 seconds if no fault is detected. If the warning light is on, the ABS system is not working but normal braking power is still available. The warning light flashes when the ABS system DTM is activated.
ABS and EBD are not available while Volvo Diagnostics is activated. Take great care when test driving as there is a serious risk of the wheels locking when braking.
When the control module DTM is disengaged, the warning light comes on for approx. 2 seconds and then goes out if no fault is detected.
The warning light is controlled by a relay on the instrument panel (dashboard). When the ABS control module grounds the signal to the relay, the relay breaks the light's ground and the light goes out. When the ABS control module increases the voltage over approx. 7 V, the relay opens and the light comes on.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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