Tire Pressure Monitoring System (TPMS) Mode Description: This mode allows the user to modify the factory Tire Pressure Monitoring System (TPMS) low tire pressure threshold values. In stock configuration, when tire pressure drops below the factory threshold value, the TPMS warns the driver by illuminating a dash warning lamp. The ProCal Module can establish alternate threshold values so that low tire pressures can be utilized without triggering a warning. Generally, the warning threshold is set 4psi less than the desired tire pressure (ie. set the threshold at 24 psi for tires running at 28psi). For a detailed description of TPMS functions please consult your vehicle’s Owners Manual. Notes: Disabling the factory TPMS should be used for off road use only and may not be legal to change is certain countries, please check local regulations. For on road use, please consult your tire manufacturer to determine an appropriate value for your vehicle’s tires and gross vehicle weight (GVW). Some users have reported the TPMS indicator lamp staying on after setting the Low Pressure Threshold to a new value. The TPMS sensors use timed and pressure-loss triggers to update the vehicle of tire pressures. In the event that the Low Pressure Threshold has changed to a value equal to or higher than actual tire pressure, the tires must be inflated to at least 5 psi over the new low value. The vehicle must then be driven up to 10 minutes above 15mph before the TPMS sensors update the vehicle of the new tire pressure. Once the reported tire pressure is 5psi above the Low Pressure Threshold the TPMS indicator lamp will turn off. Procedure: Consult the Quick Reference Guide and set the DIP switches accordingly. With the engine off and ignition on, plug the module into the OBD port and wait for the horn to sound. If the horn does not sound, consult the troubleshooting section of these instructions.