Modern Tire Dealer

MAR 2019

Magazine for the professional tire industry

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M T D M a r c h 2 0 1 9 60 T P M S SUBJECT VEHICLES: 2007 – 2018 Toyota Sienna. RELEARN PROCEDURE? No. SPECIAL TOOLS NEEDED? Yes, a Toyota Techstream. T he tire pressure monitoring system (TPMS) on 2007 – 2018 Toyota Siennas is designed to provide warning when tire inflation pres- sure of one or more road tires is low. A tire pressure warning valve sub-assembly equipped with a tire pressure sensor/trans- mitter is installed in each tire and wheel assembly. e sensor measures the air pres- sure and internal temperature of the tire. ese measured values and the transmit- ter ID are transmitted to the tire pressure monitor antenna and receiver assembly on the body via radio waves. is data is then sent to the tire pressure monitor electronic control unit (ECU) from the tire pressure monitor receiver. If the transmitter ID has been previously registered, the ECU compares the measured air pressure value and the standard value. When the value is less than the standard value registered in the tire pressure monitor ECU, the tire pressure warning light on the instrument cluster will turn on. In order to reset the warning threshold in response to changes in tire pressure values due to tire type and installation position changes, a tire pressure warning reset switch is used. is switch is used to initialize the system aer certain repair procedures. Under the following conditions, the system may not function properly: • Facilities or devices that use similar radio wave frequencies are located in the vicinity. • A radio device of similar frequency is used near the vehicle. • A large amount of snow or ice is stuck to the vehicle, especially around the wheels or wheel housings. • e ID of the tire pressure warning valve and transmitter has not been registered with the ECU. • Tires and wheels are installed that are Toyota Sienna 2007-18 T P M S PHOTO AND ARTWORK COURTESY OF TOYOTA MOTOR SALES U.S.A. INC. Figure 1: Locating the tire pressure monitoring system (TPMS) reset switch.

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