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Ysding EL-50448 TPMS Relearn Reset Auto Tire Pressure Monitor Sensor Activation Tool OEC-T5 for GM Series Vehicle Most of G.M vehicles equipped with a 315 or 433 MHz (TPMS) Tire Pressure Monitoring system,a "Sensor Re-Learn Procedure" must be performed after tire rotations.This re-learn procedure can be performed by using EL-50448 special tire pressure tool.EL-50448works on 2014 G.M models too. The tire pressure sensor on models in and after 2012 can be read, only with some specified diagnostic tools.Before tire pressure monitoring system works normally properly, the body control module will record ID information of each position in the tire pressure sensor;and use the following methods to read the tire pressure sensor.After replacing a tire or wheel speed sensor. Specific Methods To Read The Tire Pressure Sensor Step 1 - Enter leaning mode Set the gearshift lever to "P" Put the ignition switch to "ON" Enter the interface of tire pressure display by DIC DIC shows "Press Set / Ctrl to re-learn" Press "Set / Ctrl" The turn signal is lighted for 3 seconds and the horn beep sound twice to enter the learning mode Step 2 - Read tire pressure sensor information Start from the front-left wheel, Make the J-46079 or Diagnostic Tool EL-50448 antenna up against the valve core position & close to the rim of the tire sidewall El-50448 tire pressure tool starts by the start switch Successful to read the tire pressure sensor information when the horn bleeps once Step 3 - Same method to read other tire pressure informationFollow the instuction above to read tire pussure of the front-right, rear-right, rear-left wheels. Turn signals is lighted for 3 seconds and the horn bleeps twice when the learning is complete.