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TPMS interesting development.
#1
Instructor
Thread Starter
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I just put mounted snows on our '10 ES350.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
#2
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Maybe the programming is specific. That is, if there are no individual sensors to report to the "head unit", then it assumes there are no problems. When the sensors report a certain psi number and it does not jive with the variance number (say 26psi - 45 psi), then the light goes on. With your spare tire reporting, then the system assumes everything is OK. No report of the other four wheels = no problem. Just a long shot theory.
#3
Instructor
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Maybe the programming is specific. That is, if there are no individual sensors to report to the "head unit", then it assumes there are no problems. When the sensors report a certain psi number and it does not jive with the variance number (say 26psi - 45 psi), then the light goes on. With your spare tire reporting, then the system assumes everything is OK. No report of the other four wheels = no problem. Just a long shot theory.
The Feds want a system that works. The system can't be inactivated (easily) by the owner.
And what happens if a battery dies in a sensor? If the light goes out you'll assume it is a system glitch that recovered and all is well.
#4
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I just put mounted snows on our '10 ES350.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
Pete
#7
Instructor
Thread Starter
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#8
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Pete
#9
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I think Pete is probably right - the TPMS only checks at some fixed interval, miles or minutes, so having the tires in the garage probably would not have any effect. For example, if you walk out some morning and find that a tire is completely flat the TPMS warning would not come on if you started but did not drive the car. Having all four tires in the trunk might might fool the system, I don't know.
Dave Mac
Dave Mac
#10
Intermediate
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I had real problems with mine when I changed to a set of winter tires, the warning light did not intially come on, then with every bump I hit on the road. The resetting was a problem too, did not always work. The trick I found was if the tire pressure was 35lbs+ then when it hit the bumps it did not alway show the warning light. I would like to know what logic it follows .
#12
Instructor
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I just put mounted snows on our '10 ES350.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
There are NO TPMS sensors on the wheels.
Spare with sensor is still in the trunk.
I figured I'd be looking at the Yellow TPMS Warning light on the dash for the winter. Today the light WENT OUT.
The symbol illuminates when the ignition is turned and the system self tests and then goes out.
Anyone know what is going on? So far my local dealer has no answer.
Actrually it came back on the day I was schgeduled to have sensors installed in the aftermarket rims.
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