GM TPMS: The Setup And Relearn Procedures - AVI OnDemand

GM TPMS: The Setup And Relearn Procedures – AVI OnDemand

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Reading: How to connect tpms to car

Reading: How to connect tpms to car

Reading: How to connect tpms to car

gm tpms systems on buick, pontiac, chevy, gmc, cadillac and hummer models are some of the easiest to repair if you have the right tools and knowledge. As of 2007, most vehicles use a system made by TRW, Schrader, or VDO which share the same relearn behaviors and procedures, with only a few exceptions (such as the Pontiac Vibe).

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shops should use a tpms tool to reset sensor positions after rotation. there is a method in the owner’s manual to “match” the sensors which involves deflating a tire for eight seconds.

to see if a code has been set on vehicles with or without a driver information center (dic), turn the key on without starting the engine and the tpms light will flash for one minute then stay on with a service tire monitor the system message. if that happens, there is a problem in the tpms system. On vehicles equipped with a DIC, a Service Tire Monitor Type message will also be displayed. When the road tire is repaired and reinstalled in the original location, the tpms indicator icon illumination and dic message may remain on the screen until the dtc is resolved and cleared.

The initial “low tire” light is similar to the “low fuel” indicator and if you add air to the low tire the light will turn off. if the driver reinflates the flat tire, they must drive a short distance for at least 30 seconds before the sensors recognize the increased pressure and turn the light off again. if the deflation is rapid, it will give a more immediate signal by flashing a warning light.

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a gm tpms has pressure, temperature and acceleration sensors. The unit also has a radio transmitter, receiver, and battery. Sensors have an estimated battery life of 10 years/150,000 miles (GM estimate). the antenna and receiver are the same as those used for the keyless entry system. the antenna is normally sandwiched between the glass layers in the front or rear glass, but some vehicles have a dedicated antenna mounted in multiple places.

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The keyless entry module communicates with the tpms sensors and relays the information to the body control module (bcm) on the can bus. If the keyless entry module or bcm is replaced, the sensors must be reprogrammed. the same goes for keychains.

Each sensor has its own unique ID number. If a new sensor is installed, the bcm must be reprogrammed with its unique ID and position on the vehicle.

Each sensor takes a pressure measurement sample once every 30 seconds while in stationary mode. If the tire pressure increases or decreases by more than 1.2 psi since the last pressure measurement, another measurement will be taken immediately to verify the pressure change. if there has indeed been a pressure change, the sensor transmits in learning mode.

Each sensor has an internal low frequency coil, and when the tpms tool is used in trigger mode, it produces a low frequency transmission that triggers the sensor. the sensor responds to a low frequency trigger by transmitting in learning mode. when the tpms antenna receives a learn mode transmission while in the tpms learn mode, it will assign that sensor’s ID number to the location on the vehicle relative to the order it was learned.

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