2003 Lexus GX 470 Owners Manual - Page 341

STARTING AND DRIVING If the indicator light does not come on when the switch is pushed, contact your Lexus dealer. If the system is used frequently, the brake actuator temperature may become too high and a buzzer will sound intermittently. If this happens, the downhill assist control system indicator light will flash and a buzzer will sound intermittently. When the temperature of the brake actuator goes down, the system will begin to operate again. Until it restarts, the active traction control system and hill−start assist control system will not operate; however, the conventional brake can be operated. " Slip indicator light With the vehicle traveling at a speed of 25 km/h (15 mph) or less, release your foot from the accelerator or brake pedal to activate the system. The vehicle will descend the hill at a low speed. While the system is operating, the slip indicator light on the instrument panel will flash and the stop lights and high mounted stoplight will be lit. If you push the "DAC" switch to turn the system off while it is in operation, the system will stop operating gradually. The downhill assist control system indicator light will flash to alert the driver. To continue driving at a low speed, push the "DAC" switch to turn the system on. The slip indicator light and downhill assist control system indicator light come on for a few seconds when the ignition key is turned to "ON". If any of the indicator lights does not come on when the ignition is turned on, contact your Lexus dealer. 327