2001 Toyota 4Runner Owners Manual - Page 211

'01 4Runner_U (L/O 0008) "ABS" warning light The light comes on when the ignition key is turned to the "ON" position. If the anti− lock brake system and the brake assist system work properly, the light turns off after a few seconds. Thereafter, if either of the systems 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, the brake assist system, the traction control system (two− wheel drive vehicles), the active traction control system (four−wheel drive vehicles) and the vehicle skid control system do not operate, but the brake system still operates conventionally. 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. "TRC" or "VSC/TRAC" warning light may come on with the "ABS" warning light (brake assist system warning light) when there is a malfunction somewhere in the anti−lock brake system (brake assist system). 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 does not come on when the ignition key is turned to the "ON" position, or remains on. D The light comes on while you are driving. A warning light turning on briefly during operation does not indicate a problem. Type A 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. Type B 2001 4RUNNER (OM35768U) 199