DavidinCT

Hey all,

Just got a strange issue. In my 2014, it should show tire pressure levels. It shows "--" for each one in all spots. If I take a tire and lower the PSI to say 20psi, the dash light will come on warning about system, if I put it back up to 33psi (where I keep my tires) the lights go off but, it still shows dashes for the pressure levels.

I had a shop check all sensors and they all report fine.

Is there a reset, or something, even with Techstream to reset the system so it can display values again?

Thanks !

swfla

iTrader: (1)

Was the spare tire checked too? Not sure if this applies to 2014, but if one sensor is down, it can affect the display. Puzzling that it shows low warning on dash. These Lexus engineers are sometimes like savants. I'm sure you know about the reset button on the knee panel below the steering wheel. You use it once you have all tires set at desired pressure.

lexo98

iTrader: (2)

Not sure if this applies but on my GS you need to drive for it to show the pressures. If you just get in and start the car 9 out of 10 times it will only show dashes. Also have any of the sensors been replaced recently ?

DavidinCT

I had them check all tires when at the tire shop. I also booted up Techstream and it did say 5 tires were registered.

I did hit that button on the Knee panel but, it didn't seem to do anything. Should I get some notification on it?

Not sure how long but, after a 57-mile trip, they still show dashes. This did all work fine before and now it's always showing dashes.

I did have a sensor out, leavihng a nice light the dash but, when they were tested, they found the bad one and replaced/reprogrammed for it.

Is there any way in Techstream, to figure out why this happening?

swfla

iTrader: (1)

I read that you hold the button until the dash light blinks three times. Then turn on ignition for about 20 minutes to finalize. This should turn off the warning light. Not certain if it will address your situation. Worth a try!

swfla

iTrader: (1)

Boykie is quite knowledgeable about Techstream.

Boykie

Go to TPMS then Data list. You should see receiving status of all 5 sensors, their batt status and pressure readings. If one of those is out - there's your problem. Try that. You may also have TMPS DTCs directly pointing to the problem at hand.

lexo98

iTrader: (2)

If you can post up the brand and part number of the new replacement. If they used the wrong sensor the light will turn off but you will only get dashes

DavidinCT

I went to data list, and it shows no communication with any of them. Nothing at all. Keep in mind, I have what's known as HACKSTREAM, a $15 setup, I think it's version 13 on a Windows 7 x86 laptop...I've had this setup for a very long time.

I did also, try manually filling all the tires, including spare to 33PSI, and hit the reset under the dash till the light flashed. Let it sit for 25 min and also Drove 57 miles, no change.

swfla

iTrader: (1)

It seems that it's either the sensors or the car's receiver. Was there any event/repair done that may have caused this? Were they working fine and suddenly one day they stopped? Sounds like maybe the one replaced sensor is different from all the others and that's the cause.

miket000

The hand held scanner / programmers require a certain sequence when programming the tpms sensors to the car. I wonder if the shop messed that process up. I have a 2007 with no location capabilities. I imagine it's more critical to do the process correctly on your model.

I've had good luck with discount tire. They have programmed my sensors for free. Even though they were installed at another shop. They should have the capability to diagnose your issue.

lexo98

iTrader: (2)

If the tire light comes on when you drop the pressure that means the sensors are programmed ro the vehicle. Of course there is always a chance something went wrong I’m still thinking you have a wrong sensor. Need the brand and part number still.

MiracleToast

I've been fighting this same problem. I have the same symptoms -- dashes, and warning light turns on when low, off when correct. However, my techstream shows real-time data from all 5 sensors. Would techstream report data if the tpms sensors were replaced with non-lexus units? Thanks!

lexo98

iTrader: (2)

I know it doesn’t make sense but the wrong sensors can still show real time data. They will also trigger the low pressure light. They just won’t show up on the dashboard.

swfla

iTrader: (1)

Going back to the shop that replaced that one sensor and asking them to reprogram all 5 sensors (full procedure) would eliminate erroneous programming. Then see if readings show up without any error light before you leave the shop.