Newest 2in1 EL50448 Plus Electronic Tire Pressure Monitor Sensor for Ford for GM Switch TPMS Auto Monitoring SystemEL 50448 plus Notice: 1. When using 50448 Plus, please make sure antenna in correct position. 2. Please make sure the 9v battery in good condition. 3. Package would not come with battery due to the rules of post office (this item has no battery). It is an essential tool for replacing tire pressure sensors, tire pressure alarms or tire replacements in models such as the for GM series (for Opel / for Chevy / for Buick / for GM / for Cadillac) for Ford series (for Lincoln / for Mercury). Monitor Sensor 50448 Plus Usage: 1. Need 1x Pcs 9V battery to work 2. Set the car in TPMS learning mode. (car horns twice) 3. Starting from the left front tire, the antenna of the dedicated tool for tire pressure monitoring is facing upwards against the tire sidewall near the rim of the valve stem to start the antenna. Press and release the button and wait for the speaker to emit a chirp. Once the speaker is chirping, the sensor information is read and the turn signal to be read at the next position will light. 4. Follow this order to rest TPMS one by one: Front left, front right, rear right, rear left. 5. After all sensors reset, the car horns twice, the TPMS re-learn finished. How do I detect which mode my device is in? Press the power button, if the Green LED flashing, means 50448 Plus in for GM mode, if the Red LED flashing, means 50448 Plus in Ford mode. How to switch between for GM and for Ford brand? Hold the power button for 3 seconds and 2 LEDs flashing 2 times, selected brands LED flashing 2 times. How to set the car to TPMS relearning mode? for GM series cars: 1. Make the gear in P position. 2. Use cruise to choose TPMS re-learn mode in the dashboard settings. 3. Horn will ring twice and the TPMS indicator flashes, then the learning mode has been successfully entered. If equipped,the message center will display the front left (LF) tire. for Ford series cars: