1Using Description: After the CAS programmer is connected to the CAS3, the LED light does not light up. The LED light will only light up after writing the EEPROM data. 2Function: Connect the CAS test platform to the CAS, after the power is turned on, whether the LED light is on or not helps to determine where the fault is. 3LED Light On: After the power is turned on, the LED light of the CAS test platform is always on, indicating that the CPU FLASH data is lost. It is recommended that you write the FLASH data of the models in the same year. 4LED Light Off: After the power is turned on, the LED light of the CAS test platform is off, indicating that the CPU FLASH data is locked caused by the unstable programmer when writing data, the EEPROM data needs to be edited. 5For CAS3 Broken Situation: When the CAS3 is broken during programming, the car cannot be started. Use the CAS test platform to connect to the CAS. After the power is turned on, the LED lights up to indicate that the FLASH data is lost, and the EEPROM data is lost and locked.