Description

FCC ID: GQ4-48T

Operational Description

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FCCID_1599063

TRW Automotive October 26, 2011 TEE 24175 Research Dr. Farmington Hills, MI 48335-2642 Tel 248.478.7210 Fax 248.699.4241 RE: Certification for GM Aftermarket ASK 315MHz TPM Sensor Model #: 221849-104 FCC ID: GQ4-48T Canada IC: 1470A-29T GENERAL DESCRIPTION The TPM Sensor is an RF transmitting device that contains an integrated tire valve stem that is mounted in the valve hole of each of the wheel rims on the vehicle. The sensor transmits the pressure and temperature inside the tire, as well as the battery voltage status of the transmitter. Each sensor’s unique tire identification code (ID) is also sent with each transmission. The sensor will transmit at 315MHz periodically when the vehicle speed is ~20mph. The vehicle speed is determined from an accelerometer that is contained within the sensor. The sensor will also transmit data if a change in the air pressure occurs while the vehicle is stationary or in a rolling state. The transmissions from each sensor have a random delay to ensure that RF signals from each tire will not interference due to simultaneous transmissions. The RF transmission format is ASK (Amplitude Shift Keying) Manchester encoded at 315 MHz. Description of Operations Mode of Explanation Frequency of Transmission Operation No transmission. Measures temperature, pressure, & 16 words when activation occurs with Storage Mode battery voltage TPM diagnostic tool for LF Learn Measures temperature, pressure, acceleration, &  6 words every 60seconds battery voltage. Transmits periodically. Enters this  16 words when activation occurs Normal Mode mode from storage when pressure goes above with TPM diagnostic tool for LF threshold. Learn 6 words whenever pressured delta > Alert Mode Transmits when significant pressure delta detected threshold Legal name here


Document Created: 2011-11-09 13:31:14
Document Modified: 2011-11-09 13:31:14
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