2003 Toyota Prius Owners Manual - Page 164

"ABS" warning light The light comes on when the ignition key is turned to the "ON" position. If the anti-lock brake system works properly, the light turns off after a few seconds. Thereafter, if the system malfunctions, the light comes on again. When the "ABS" warning light is on (and the brake system warning light is off), the anti-lock brake system does not operate, but the brake system still operates conventionally. Vehicle sold in U.S.A. A warning light turning on briefly during operation does not indicate a problem. CAUTION If the "ABS" warning light remains on together with the brake system warning light, immediately stop your vehicle at a safe place and contact your Toyota dealer. In this case, not only the anti-lock brake system will fail but also the vehicle will become extremely unstable during braking. Either of the following conditions may occur, but does not indicate the malfunction: 30p002a When the "ABS" warning light is on (and the brake system warning light is off), the anti-lock brake system does not operate so that the wheels could lock up during a sudden braking or braking on slippery road surfaces. If either of the following conditions occurs, this indicates a malfunction somewhere in the parts monitored by the warning light system. Contact your Toyota dealer as soon as possible to service the vehicle. D The light may stay on for about 60 seconds after the ignition key is turned to the "ON" position. It is normal if it turns off after a while. 30p007a D Depressing the brake pedal repeatedly may turn on the light. It is normal if it turns off after a few seconds. D The light does not come on when the ignition key is turned to the "ON" position, or remains on. Vehicle sold in Canada D The light comes on while you are driving. 157