![]() ![]() The signals can be blocked by components like rotors, calipers and knuckles. If you can not get a sensor to initialize, try pushing the vehicle forward a foot or two.Aim at the sidewall below the valve stem, and not at the stem.This decreases the chance of other radio signals interfering with the relearn process. It is best to perform the TPMS relearn procedure away from the shop in the parking lot.When the TPMS antenna receives a learn mode transmission while in TPMS learn mode, it will assign that sensor’s ID number to the location on the vehicle relative to the order in which it was learned. ![]() The sensor responds to low frequency activation by transmitting in learn mode. When the TPMS tool is used in activate mode, it produces a low frequency transmission that activates the sensor. If a pressure change has indeed occurred, the sensor transmits in learn mode.Įach sensor has an internal low frequency coil. If the tire pressure increases or decreases by more than 1.2 psi from the last pressure measurement, another measurement will occur immediately to verify the change in pressure. If a new sensor is fitted, the body control module must be reprogrammed with its unique ID and its position on the vehicle.Įach sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. ![]() If the Keyless entry module is replaced, the sensors must be relearned, same with the key fobs.Įach sensor has its own unique ID number. The keyless entry module communicates with the TPMS sensors and relays the information with the Body Control Module (BCM) on the CAN BUS. But, some vehicles have dedicated antenna mounted in various places. The antenna is typically sandwiched between the layers of glass in the front or rear glass. The antenna and receiver is the same one that is used for the keyless-entry system. The unit also has a radio transmitter, receiver and battery. If the deflation is rapid, it will give a more immediate warning by flashing the warning light.Ī GM TPMS sensor has pressure, temperature and acceleration sensors. If the driver re-inflates the low tire, they must drive a short distance for at least 30 seconds before the sensors recognize the increase in pressure and turn the light off again. The initial “low tire” light is similar to the “low fuel” indicator and adding air to the low tire will extinguish the light. When the road tire is repaired and reinstalled in the original location, the TPM indicator icon illumination and DIC message may remain displayed until the DTC is resolved and cleared. On vehicles equipped with a driver information center, it will also display a Service Tire Monitor type message. If that occurs, a TPM system problem exists and the system will have set a DTC. On vehicles without a driver information center, you will know you have a code set if you turn the key on, without starting the engine, and the TPMS light blinks for one minute and then stays on solid with a Service Tire Monitor System message (on vehicles equipped with a DIC). There is a method in the owner’s manual to “match” the sensors that involves deflating a tire for eight seconds. Shops should use a TPMS tool to reset the sensor positions after rotation. ![]()
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