TPMS sensor antennas location?

[UCrazyKid]

Where are the TPMS sensor antennas located in a 2011 LX570? Specifically the one for the spare location? Is there one central location (as the 2011 has no idea if the individual tire locations, or is there one for each corner and the spare?

Temps dropped in the Midwest and it triggered low pressure warnings. I filled all 5 tires up, system now cannot connect to the spare.

Any advice?
Andy

 

[doru]

Each sensor has its own built-in antenna. There are no other antennas around the wheels.
With cold temps some sensors may not have enough juice left in the battery to be able to connect to the TPMS system especially in the back of the truck.
Connectivity issues are best resolved with a tool that wirelessly connects to the sensor (when placed next to the valve stem) and reads sensor status like battery life and can try to "wake" up the sensors if they are still communicating. If you don't have one you can buy one or go to the local tire shop and let them do it.

W/o a tool you have to guess and do experiments to deduct what might be wrong. Some things to try:
- find out what tire(s) is the problem by changing pressure on the tires and reading the display to see which one doesn't change (assumes the 2011 displays the pressure for each like my 2013 does)
- once you find the unresponsive tire, play with large changes in tire pressure up and down to see if that wakes it up
- bring it closer to the front of the truck
- switch one of the front tires with that one and go for a drive.

Q: how do you know it is the spare that cannot connect? The 2011 does not show you tires locations.

 

[UCrazyKid]

Each sensor has its own built-in antenna. There are no other antennas around the wheels.
With cold temps some sensors may not have enough juice left in the battery to be able to connect to the TPMS system especially in the back of the truck.
Connectivity issues are best resolved with a tool that wirelessly connects to the sensor (when placed next to the valve stem) and reads sensor status like battery life and can try to "wake" up the sensors if they are still communicating. If you don't have one you can buy one or go to the local tire shop and let them do it.

W/o a tool you have to guess and do experiments to deduct what might be wrong. Some things to try:
- find out what tire(s) is the problem by changing pressure on the tires and reading the display to see which one doesn't change (assumes the 2011 displays the pressure for each like my 2013 does)
- once you find the unresponsive tire, play with large changes in tire pressure up and down to see if that wakes it up
- bring it closer to the front of the truck
- switch one of the front tires with that one and go for a drive.

Q: how do you know it is the spare that cannot connect? The 2011 does not show you tires locations.

I know it is the spare because I programmed them myself when I changed wheels. And the spare is a road tire and the rest are AT’s so I don’t do a 5 wheel rotation. So the location in the list of 5 (though not labeled for location on the 2011) stays the same.

Things are warming, and I will try to “wake it up” as you say. Thanks!