1Replacmenet for Gm All Series, replacmenet for Buick All Series. There are 4 radio frequency transmitting pressure sensors and serial data circuits to perform the read?in mode function of the tire pressure monitoring system. Every time the tire rotates, the body control module is replaced, or the sensor is replaced, the sensor must be read in again. 2Once the reread mode is enabled, the identification code of each sensor will be read into the body control module memory. When reading the sensor identification code, the body control module buzzes, indicating that the sensor has sent the identification code, and the body control module has received and read it in. 3The body control module reads the identification codes in the correct sequence to determine the sensor location. The first identification code read is assigned to the left front position, the second is assigned to the right front position, the third is assigned to the right rear position, and the fourth is assigned to the left rear position. The turn signal lights will light up to indicate the correct reading sequence. 4There is a low?frequency coil inside each sensor, the design is reasonable and scientific enough. When using tire pressure monitoring in enable mode, it generates a low?frequency transmission signal to activate the sensor well. 5In static mode, each sensor performs a pressure measurement sampling every 30 seconds. If the tire pressure increases or decreases by more than 8.3 kPa (1.2 lbf/square inch) compared to the last measured value, a re-measurement will be performed immediately to confirm the pressure change value. 6If the air pressure does change, the sensor transmits in read-in mode. In the tire pressure monitoring read-in mode, after receiving the read-in mode transmission signal, the body control module assigns the sensor identification code to the vehicle position corresponding to the read-in sequence.