Summary of functions Use the front-wheel drive control switch to select the following transfer modes:
Shifting between "2WD" and "4H" ■ Shifting from "2WD" to "4H" 1. Reduce vehicle speed to less than 62 mph (100 km/h). 2. Turn the front-wheel drive control switch to "4H". The "4HI" indicator will come on. ■ Shifting from "4H" to "2WD" 1. Reduce vehicle speed to less than 62 mph (100 km/h). 2. Turn the front-wheel drive control switch to "2WD". The "4HI" indicator will go off. Shifting between "4H" and "4L" ■ Shifting from "4H" to "4L" 1. Stop the vehicle completely and continue to depress the brake pedal. 2. Shift the shift lever to N. 3. Push and turn the front-wheel drive control switch to "4L". The "4LO" indicator will come on. ■ Shifting from "4L" to "4H" 1. Stop the vehicle completely and continue to depress the brake pedal. 2. Shift the shift lever to N. 3. Push and turn the front-wheel drive control switch to "4H". The "4LO" indicator will go off. ■When the front-wheel drive control switch is shifted to "4L" VSC is automatically turned off. ■If the "4HI" indicator flashes The transfer mode may not successfully change. Drive straight ahead while accelerating or decelerating, or drive in reverse. ■If the "4LO" indicator continues to flash The transfer mode may not successfully change. Operate the front-wheel drive control switch again. ■If the "4LO" indicator continues to flash and a buzzer sounds The shift lever is not in N and/or the vehicle is moving. Stop the vehicle completely, shift the shift lever to N and make sure that the indicator stops flashing. ■If the "4HI" or "4LO" indicator flashes rapidly There may be a malfunction in the four-wheel drive system. Have the vehicle inspected by your Toyota dealer immediately. ■Four-wheel drive usage frequency You should drive in four-wheel drive for at least 10 miles (16 km) each month. This will assure that the front drive components are lubricated.
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Toyota Tundra Service Manual > Theft Deterrent System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the pow ...