[lowrydr310]

My 06 325i and 330i have (had) FTM by default, using the wheel speed sensors. My 07 335i has TPMS and this past week one of the sensor batteries died, giving me intermittent TPMS inactive errors. So I disabled TPMS and switched to FTM.

I found a bunch of general instructions but nothing was specific to the Pre-LCI E93 that I have. What I found is that the E93 RDC RDC module is not easily accessible. It's sandwiched behind the rear seats (similar spot as the EKPM) and not easy to disconnect, so I disconnected the fuse. Many videos online show the fuses but none are for the E93. I pulled the fuse cover in the back of the glovebox which showed #13 for the RDC so I removed that.

Then onto coding. My 335 has no iDrive, so no CCC/CIC to code. Just KOMBI and DSC. I removed $2VB from the VO and default coded DSC and KOMBI, but still got the TPMS error on KOMBI even after several power cycles and letting the car go to sleep.

Then I found this post on the M3 forum which fixed it.

I *didn't* add $265 to the VO (which enables the FTM) however I did make the manual changes which essentially do the same thing:

KOMBI: RDC_ALIVE
nicht_aktiv
KOMBI: MMI_ENA_RPA_RDC ** Optional if you want FTM enabled ** 
aktiv
KOMBI: RDC_VERBAUT
nicht_aktiv
KOMBI: DSC_MIT_RPA_CC ** Optional if you want FTM enabled ** 
aktiv
KOMBI: RDC_DISP_SWITCH
nicht_aktiv

And that got rid of the TPMS inactive error.

There were a few other minor changes in the FSW_PSW.TRC file that I pulled after default coding, I'm guessing these were related to the deactivation of TPMS.

I don't know if FTM is working, though it does show up in KOMBI and I can reset it. I need to go back and add $265 to the VO and default code the DSC module again to ensure it's configured for FTM to work.

[StradaRedlands]

Good on ya, this is such a nice change, especially if you don't have a CIC/CCC.
I actually did this on the '09 E91, but TBH don't even know how I pulled it off.
Coding is just magic. Some people have it, others not so much.

[ppointer]

Originally Posted by lowrydr310

My 06 325i and 330i have (had) FTM by default, using the wheel speed sensors. My 07 335i has TPMS and this past week one of the sensor batteries died, giving me intermittent TPMS inactive errors. So I disabled TPMS and switched to FTM.

I found a bunch of general instructions but nothing was specific to the Pre-LCI E93 that I have. What I found is that the E93 RDC RDC module is not easily accessible. It's sandwiched behind the rear seats (similar spot as the EKPM) and not easy to disconnect, so I disconnected the fuse. Many videos online show the fuses but none are for the E93. I pulled the fuse cover in the back of the glovebox which showed #13 for the RDC so I removed that.

Then onto coding. My 335 has no iDrive, so no CCC/CIC to code. Just KOMBI and DSC. I removed $2VB from the VO and default coded DSC and KOMBI, but still got the TPMS error on KOMBI even after several power cycles and letting the car go to sleep.

Then I found this post on the M3 forum which fixed it.

I *didn't* add $265 to the VO (which enables the FTM) however I did make the manual changes which essentially do the same thing:

KOMBI: RDC_ALIVE
nicht_aktiv
KOMBI: MMI_ENA_RPA_RDC ** Optional if you want FTM enabled ** 
aktiv
KOMBI: RDC_VERBAUT
nicht_aktiv
KOMBI: DSC_MIT_RPA_CC ** Optional if you want FTM enabled ** 
aktiv
KOMBI: RDC_DISP_SWITCH
nicht_aktiv

And that got rid of the TPMS inactive error.

There were a few other minor changes in the FSW_PSW.TRC file that I pulled after default coding, I'm guessing these were related to the deactivation of TPMS.

I don't know if FTM is working, though it does show up in KOMBI and I can reset it. I need to go back and add $265 to the VO and default code the DSC module again to ensure it's configured for FTM to work.

What is FTM?

[lowrydr310]

Originally Posted by ppointer

What is FTM?

Flat tire monitor. It uses wheel speed sensors to detect a flat when one of the wheels has a smaller diameter and is rotating faster than the others. My 2006 E90s both had it set up this way, my 2007 has TPMS sensors. I believe the non-US market used FTM as wel as the TPMS was a US-only requirement.

Here's how sensitive it is: My 06 330 has a slow leak from a rear tire that loses about 10psi every 4 weeks. I inflate to 36psi and when the tire gets to 25psi it triggers the flat tire warning. I refill to 36 (and check the other tires which are usually fine) and then reset the FTM, and when it gives me the flat tire warning that tire is back to 25psi.

Now to fix that leak; It has to be a valve stem or some puncture that isn't obvious.

[StradaRedlands]

Originally Posted by lowrydr310

Flat tire monitor. It uses wheel speed sensors to detect a flat when one of the wheels has a smaller diameter and is rotating faster than the others. My 2006 E90s both had it set up this way, my 2007 has TPMS sensors. I believe the non-US market used FTM as wel as the TPMS was a US-only requirement.

FWIW, some early production 2007 cars had FTM as well.

[ppointer]

Originally Posted by lowrydr310

Flat tire monitor. It uses wheel speed sensors to detect a flat when one of the wheels has a smaller diameter and is rotating faster than the others. My 2006 E90s both had it set up this way, my 2007 has TPMS sensors. I believe the non-US market used FTM as wel as the TPMS was a US-only requirement.

Here's how sensitive it is: My 06 330 has a slow leak from a rear tire that loses about 10psi every 4 weeks. I inflate to 36psi and when the tire gets to 25psi it triggers the flat tire warning. I refill to 36 (and check the other tires which are usually fine) and then reset the FTM, and when it gives me the flat tire warning that tire is back to 25psi.

Now to fix that leak; It has to be a valve stem or some puncture that isn't obvious.

Very cool. Thank you for facilitating my learning process for today!