2010 Toyota Highlander Owners Manual - Page 254

2-4. Using other driving systems n Conditions in which the downhill assist control system does not operate l In the following situations, the downhill assist control system indicator flashes and the downhill assist control system does not operate or will stop operating: • The shift lever is not in 1 range of S mode or R. • The vehicle speed is higher than 15 mph (25 km/h). l If the accelerate or brake pedal is depressed, the downhill assist control system will stop operating with the downhill assist control system indicator stayed on. n If the "DAC" switch is turned off during operation of the downhill assist control system The downhill assist control system gradually ceases operation. The downhill assist control system indicator will flash during the canceling operation, and then go off when the system is fully off. n Downhill assist control system operation sound l A sound may be heard from the engine compartment during operation of the downhill assist control system. This sound does not indicate a malfunction. l If the accelerator or brake pedal is depressed during operation of the downhill assist control system, a sound caused by the release of system operation may be heard, or you may feel the brake pedal push-back. This does not indicate a malfunction. n When the downhill assist control system operates continuously The brake actuator may overheat. In that case, the downhill assist control system will stop operating, a buzzer will sound and the downhill assist control system indicator will start flashing. Refrain from using the system until the downhill assist control system indicator stays on. (There is no problem with continuing driving normally.) n If the slip indicator comes on...It may indicate a malfunction in the system. Contact your Toyota dealer. 226