Could This Be a BCM Issue?

[YukonRog]

I changed the Steering Position Sensor right? I know I bumped the BCM. Now I can't get any TPMS readings, nor does the manual learn work. I get the two horn beeps acknowledging it's ready but I get nothing when letting air out of the DS front tire. Is this BCM controlled?

 

[Joseph Garcia]

I believe that it is BCM controlled, but I'll let more knowledgeable folks here chime to confirm or deny.

 

[YukonRog]

So taking someone's advice I took it to America's Tires and the tech there couldn't get any of the was wheels to read. The vehicle enters the learn mode but nothing responds. I'm at a loss.

 

[George B]

I believe the signal comes in through the RCDLR or remote door lock receiver if that helps. I thought it was the passenger lock switch but not certain.
Just some info

 

[George B]

More:

2012 Tahoe LT/Tire Air Sensor and Remote Control Problems

Hi guys, for a few days the remote control of my tahoe has not worked and the tire air sensor turned on. Has this happened to someone and have they been able to solve it? It's a 2012 Tahoe LT. I can only open the door with the key and I cannot open the suitcase. greetings and thanks

www.tahoeyukonforum.com

 

[YukonRog]

I believe the signal comes in through the RCDLR or remote door lock receiver if that helps. I thought it was the passenger lock switch but not certain.
Just some info

George B I responded on the other thread I couldn't find this but now I have. I don't know if this applies to my '05. And both remotes have fresh batteries and work great. So, no connection maybe?

 

[George B]

George B I responded on the other thread I couldn't find this but now I have. I don't know if this applies to my '05. And both remotes have fresh batteries and work great. So, no connection maybe? Are you near someone with a tech2? Maybe they can help you.

 

[YukonRog]

No no where's near one.

 

[TJ Baker]

So just now seeing this... If I read the thread right you have an 05? I have an 05 Yukon. On mine the TPMS is part of the passenger door module. Last time I tried the relearn it failed over and over on the last wheel. In my case I was fortunate to have the sensor ID numbers and I was able to use an OBD2 adapter and write the values to the correct location myself.

 

[Doubeleive]

I changed the Steering Position Sensor right? I know I bumped the BCM. Now I can't get any TPMS readings, nor does the manual learn work. I get the two horn beeps acknowledging it's ready but I get nothing when letting air out of the DS front tire. Is this BCM controlled?

have you tried any other wheels? maybe that one tpms sensor has a low or dead battery, if the others work that would confirm or rotate the wheels to confirm if others work

 

[YukonRog]

have you tried any other wheels? maybe that one tpms sensor has a low or dead battery, if the others work that would confirm or rotate the wheels to confirm if others work

Yeah had a tech at America's Tires try to read all 4. Zip.

 

[YukonRog]

So just now seeing this... If I read the thread right you have an 05? I have an 05 Yukon. On mine the TPMS is part of the passenger door module. Last time I tried the relearn it failed over and over on the last wheel. In my case I was fortunate to have the sensor ID numbers and I was able to use an OBD2 adapter and write the values to the correct location myself.

Interesting. I don't have a Tech 2 only a Launch Millennium 90. No codes. It only does so much bidirectional too. I'll have to research that.

 

[TJ Baker]

Interesting. I don't have a Tech 2 only a Launch Millennium 90. No codes. It only does so much bidirectional too. I'll have to research that.

I found the Tech2 fairly useless here.

I actually used one of those $15 bluetooth adapters. That and a serial terminal app. It happens to be a hobby of mine, fiddling with the old GM single wire serial data stuff.

 

[TJ Baker]

Too bad my girlfriend sold the Penn Valley place or I could assist. Way out in Colorado now.

 

[YukonRog]

I found the Tech2 fairly useless here.

I actually used one of those $15 bluetooth adapters. That and a serial terminal app. It happens to be a hobby of mine, fiddling with the old GM single wire serial data stuff.

Sounds like computer programming to me. What did you use with the bluetooth?

 

[YukonRog]

Too bad my girlfriend sold the Penn Valley place or I could assist. Way out in Colorado now.

Ohh too bad. I would drive to Penn Valley. But not Colorado. LOL!

 

[TJ Baker]

Sounds like computer programming to me. What did you use with the bluetooth?

As I mentioned I used a serial terminal app. I have learned to speak the language of the network and can just send the right messages to the passenger door module instead of paying for some fancy softwares to do it for me! The lucky part was having previously read out the block memory locations of the PDM so I had the TPMS ID##s on record.

So it really was just typing in few lines like...

ATSH6CA1F1
3BD88FE5F38FE615

 

[YukonRog]

As I mentioned I used a serial terminal app. I have learned to speak the language of the network and can just send the right messages to the passenger door module instead of paying for some fancy softwares to do it for me! The lucky part was having previously read out the block memory locations of the PDM so I had the TPMS ID##s on record.

So it really was just typing in few lines like...

ATSH6CA1F1
3BD88FE5F38FE615

Easy for you! I can reprogram a map for my Harley and change AFR's and Stoichometric Values and timing, create spread sheets and things like that but I cant write programs. Guess if I learned it maybe. But here's my question, the keyless fobs work, would just the TPMS Receiver go out in that RCDLR?

 

[TJ Baker]

Easy for you! I can reprogram a map for my Harley and change AFR's and Stoichometric Values and timing, create spread sheets and things like that but I cant write programs. Guess if I learned it maybe. But here's my question, the keyless fobs work, would just the TPMS Receiver go out in that RCDLR?

Well that isn't a program, just a couple messages. The first line sets the header for the OBD2 adapter to send when the following message is sent. In 3 bytes it contains the message type, target of the message and sender of the message. The second line sends two sensor ID#s, front left and front right to memory block D8.


I cannot say I know which module contains the keyfob components on the Yukon !! On my TrailBlazer it is the liftgate module. Maybe I'll have a look tommorow.

 

[TJ Baker]

Check your door switch functions on both drivers and passenger doors.

If you disturbed the communications wiring between them this would happen because the messages from the passenger door module where the keyfob and TPMS fumctions reside could then not get to the BCM.