On 2007 Chrysler Pacifica - When the car is started, the alarm sounds and the service tire system soon light flashes 8 or 9 times and then remains on. Do I have worn out batteries in the sensors or ??? And if the batteries need to be replaced, where do I buy the parts and are there any surprises awaiting me? (I live in Canada so Canadian Tire, NAPA and Walmart are options - unless you include the expensive dealership as a source for parts)

SOURCE: 2004 chrysler pacifica service tire system light

Make sure that your tire pressure sensors were not damaged. one simple way to check what tire sensor is causing the problem is to lower each tire individually and check to see if the message displays to a different tire or more than 1, depending on the TPM system your pacifica has. Chrysler has a TPM (tire pressure monitor) tester which can check each individual sensor for correct operation. and the sensor's batteries have typically a 5-7 year life span.

SOURCE: Service Tire Soon @ 2004 Pacifica

dont have it disconnected make them fix the problem the computer needs to be reprogramed

SOURCE: 2002 town & country "service tire system soon"

If all the sensors retrained, you either still have low tire pressure, or the computer which reads the sensors needs to be reprogrammed with a different tire pressure threshold.

SOURCE: Service Tire System Soon

there should be a tire reset button either inside the cars fuse box or under the hood in one of those fuse boxes

SOURCE: I have a service tire system soon alert on my 2004

This is likely a mileage triggered warning. If you have good tires already, a rented scanner will allow you to reset the mileage goal and clear the message. Alternatively, go back to where you bought the tires and see if they will erase the warning.