Adding spare TPMS sensor to dash display with Autel TS508

2020 manufactured 07/20

Aftermarket wheels with OEM sensors
Stock steel wheel with OEM sensor (used as spare)

I am trying to add the spare sensor to my display. I can not get the spare to show. I scanned all 5 sensors and then connected to the OBD to write them. I have tried options 1-4 when selecting the year/sensor type. Does the spare show immediately after the OBD write is complete? What am I missing? @roughfisher any ideas? Do all 5 sensors have to be the same for it to work?

 

I believe I used the second setting on your screen for my sensors because I have push to start. I'm wondering if the mix of the sensors between the alloy and steel has something to do with it?
I did a OBD relearn in the advanced settings (page 34 in manual), said to overwrite existing data, scanned all four tires, then it asked me if I wanted to scan the spare so I did. then I plugged into OBD port and it asked something about writing the spare and I clicked OK. The spare info displayed almost instantly once it was written to the TPMS module via OBD.

 

Mine is key start. I'm wondering if Autel would know. I'll have to scan them again but after I scan all 5 sensors, I noticed that the connector next to the spare is gray, but I don't remember if it was before or after the OBD update. Mine did not ask me about writing the spare when connected to the OBD.

 

You have to scan the spare before you connect to OBD. After I scanned all four sensors in the order they prompt you I went back and selected the spare slot and scanned that sensor. Then I plugged in to OBD and it took care of it. I assume your unit is updated to latest firmware?

 

I scanned the spare along with the other 4.Yes it is updated.

 

Went out an messed with it this morning. The hangup is something with the 5th position. I used option 4 for this round. I have my running wheels at 38 psi, and the spare is at 19 psi. If I scan 3 wheels and scan the spare as the 4th wheel, they write to the ECU and the display shows all 4 wheels, 3 at 38 psi and the 4th at 19 psi. That shows that there can be a mixture of the OEM sensors loaded. After that I scanned again with the same process but this time scanned the last running wheel as the spare. Once all 5 are scanned and the signal is received (all green), I connect to the OBD for the learn. Once the process is finished, the icon at the 5th position is gray. @Jeff_5_7 any ideas?

 

interesting, I checked my unit yesterday and I definitely used option 2 when I did mine. I wouldn't think there would be a difference between a MY20 and MY21 for the ability to display the spare, but maybe there is a difference between keyed ignition an PTS? I was debating on walking through this process again on my truck step by step but kind of don't want to mess with it until my next tire rotation in the chance that whatever i did was a fluke LOL

 

I wouldn't think there would be a difference either. At least so far I know that both OEM sensor types can be loaded and read at the same time. I tagged @Jeff_5_7 to see if he had any ideas.

 

I am not an expert in the sensors but do know they can be touchy if you will. The only good results I have seen have been with the OEM sensors.

When you look at the concept you need to store the ID of all 5 sensors in the TPMS ecu. It’s my understanding that Toyota locked the ability to write to the 5th location. It can be enabled via OBD commands however. Obviously when the ecu knows the IDs of the sensors it polls them at an interval to read the data wirelessly and then sends it to the cluster display.

I think you have proven that the OEM steel and alloy sensors are working. The steel one was shown on the cluster display right?

Seems your problem is you can’t store data in the 5th position until it is unlocked. I would be surprised if the Autel knows the Toyota message structure to unlock it but it might. I have never heard of any tool with the ability to do it. It can be done using a similar message structure as enabling/disabling the seat belt warning in the instrument cluster.

I see @roughfisher got his to work but the theory would be his 5th position was already unlocked. Maybe Toyota left it open starting in 2021 or only on the smart key trucks. I am not sure

 

When I scanned 3 wheels and the steel wheel as the 4th, the steel wheel did show in the display. That's how I confirmed that both OEM style sensors can be displayed together.

 

I ran across a video that says the TS508 unlocks the ECU during the OBD relearn process. Now I just have to figure out why the spare isn't loading.

 

Just went out and messed with it. I think I have an idea as to why it isn't working. Option 3 and 4 will scan my sensors. Option 1 and 2 will not. On Option 3 for the alloy wheels, it shows the 0C091 as the OEM part number which is what I have. Opt 4 shows the OEM part number for the steel wheel. The only thing that I can see being the issue is that the ECU might be looking for the same part number for all 5 positions. The only way that I can think of to check this is either buy a 5th sensor, or try this process on our 4Runner. We have aftermarket wheels on the 4R with OEM sensors which should be the same part number as what is in the stock wheels. I'm thinking that if I scan 5 wheels on it and it works that it must be my issue with the Tundra.

 

Not a big deal since I'll get a full size spare in the future but picked up a 5th sensor from the dealer and quickly tried option 3 and it did not work. I'll mess with it this weekend I guess.

 

Hopefully you will get it to work one of these times!

 

Sent you a PM.

 

Did the relearn today with the Autel after rotating tires a few days ago. Super easy. It did allow me to add the spare during the process. Mine is a 21 push button start so seems to confirm the compatibility with push button trucks.

 

Did you scan and then the write to ECU option (or however it was worded)? I haven't looked at it in a while. Mine is a 2020 key start and I would think that the TPMS module would be the same.

 

So here is what I selected after selecting Toyota and Tundra:
1. 01/2020-12/2022 (315MHz Alloy C015)
2. Position Relearn
3. OBD Relearn
(Photos below are not in the correct order.)

Then it will ask you to scan each wheel, then ask if you want to include the spare. Scanned it and then follow the steps to plug in, write, etc.

My assumption based on what you posted above and what @roughfisher posted the "CO15" part of the option means the push button start models?

 

I'll have to go back and refresh my memory but I think the C015 has something to do with the part number of the sensors.

 

I used the second option like you did, the 2020-2022 315MHz alloy C015, even though I had aftermarket sensors in my new wheels. I still have my factory wheels with the OEM sensors in case I ever need to mount them in the future. I'm not sure if selecting that protocol is to ensure the TPMS module is able to read the specific sensor or if it ensures that the CPU can read the specific TPMS module, or both?