2005 Toyota 4Runner Owners Manual - Page 171

'05 4Runner_U (L/O 0409) D You may feel vibration or noise in your vehicle, caused by operation of the brakes. This indicates the system is functioning properly. The slip indicator light comes on for a few seconds when the ignition key is turned to "ON". If the indicator light does not come on when the ignition is turned on, contact your Toyota dealer. The brake actuator temperature increases during continuous operation of the active traction control system, the vehicle stability control system, the downhill assist control system and the hill −start assist control system such as on slippery roads. If the brake actuator temperature becomes too high while any of the systems is operating, a buzzer will start to sound intermittently to indicate that the active traction control system can no longer operate. In this case, immediately stop your vehicle at a safe place. If the system continues to operate, the buzzer sound changes from intermittent to continuous. (The continuous buzzer sounds for about 3 seconds.) At the time, the slip indicator light will come on and the active traction control system temporarily stops operating in order to protect the brake actuator. (Although the active traction control system does not operate, there is no problem to continue your driving.) The system will be automatically restored after a short time and the slip indicator light goes out. Leave the system on during the ordinary driving so that it can operate when needed. You may hear a sound in the engine compartment for a few seconds when the engine is started or just after the vehicle begins to move. This means that the active traction control system is in the self − check mode, but does not indicate a malfunction. When the active traction control system is operating, the following conditions occur: D The system controls the spinning of the 4 wheels. At this time, the slip indicator light blinks. 171 2005 4RUNNER from Sep. '04 Prod. (OM35843U)