SYMPTOM: The amber TPMS light on the dashboard flashes for a minute or so and then stays lit; there is no "TIRE PRESSURE WARNING" on the alpha-numeric cluster display. Checked tire pressures, all are OK.

I read out the OBD II codes and I'm seeing these codes from the BCM (Body Control Module) and this looks like the problem might be the BCM and not a dead TPMS sensor in one of the tires. I plan on checking the connectors to the BCM as my next step. I've learned it's down behind the trim panel on the right side of the passenger footwell.\

DOES ANYONE HAVE ANY OTHER SUGGESTIONS HERE?

If I have to replace the BCM, can I just get the part and swap it in- or is there some kind of programming needed?

================================================
OBD II CODES
BCM (Body Control Module)

Version Information
Ecu Part Number284B2-1V47B
DTC Qty (12)

• U1000CAN COMM PAST ERROR RECORDED
• U0415VEHICLE SPEED PAST ERROR RECORDED
• B2562LOW VOLTAGE PAST ERROR RECORDED
• C1704FLAT TIRE FL SEE SERVICE MANUAL PAST ERROR RECORDED
• C1705FLAT TIRE FR SEE SERVICE MANUAL PAST ERROR RECORDED
• C1706FLAT TIRE RR SEE SERVICE MANUAL PAST ERROR RECORDED
• C1707FLAT TIRE RL SEE SERVICE MANUAL PAST ERROR RECORDED
• C1708[NO DATA]FL SEE SERVICE MANUAL PRESENT ERROR
• C1709[NO DATA]FR SEE SERVICE MANUAL PRESENT ERROR
• C1710[NO DATA]RR SEE SERVICE MANUAL PRESENT ERROR
• C1711[NO DATA]RL SEE SERVICE MANUAL PRESENT ERROR
• C1729VHCL SPEED SIG ERR PAST ERROR RECORDED

 

Now that I look at the error codes, I think it's not the Body Control Module, but the "TPMS Antenna" ( which is actually the whole 315 MHz TPMS radio transceiver, not just an "antenna" ) I think it's P/N 40740-1NC2A for my 2013 G37x. The codes from the BCM look to me like no data is being received from the "TPMS Antenna" which lives behind the glove compartment.

They are $200~$60 for various new and used ones out there.

I ordered a used one which is said to have been working OK when the donor G37 was parted out. We'll see.

There's a YouTube video that shows how to replace this: [Is it proper English to say "no data is being received" - isn't DATA plural, with DATUM being the singular? Wouldn't you say "no data ARE being received?" Or you could just say "it don't work, it's all busted." ]

 

You beat me to it, I'd say that Tire Data Receiver would be the first thing to check since you're showing "no data" on all 4 tires. Make sure that receiver hasn't been disconnected or has simply failed.

Unless your snow tires are mounted on different wheels and you just put them on without thinking about it.

It seems we use the word "data" like the word "information" now. I guess "datum" is the correct singular form in Latin but doesn't get used these days outside of specialized scientific fields.

 

The tire shop "paired" the winter tires' TPMS's , so TPMS worked for a month after I switched over from the Michelins to the Blizzaks.

Blizzaks are on the original 2013 17" Infiniti wheels that the car came with. ('3 spoke")

The Michelins are on a set of new 2016 17" Infiniti Q60 wheels that I bought. ("2 spoke") - you can find quite a few OEM Infiniti 17" wheel sets for sale. many buyers want the car but want 18" wheels so dealers change them over and are left with brand-new sets of 17s to sell.

Yeah, I'm thinking it's got to be the 315 MHz radio transceiver that died, the so-called "TPMS Antenna." Or maybe a plug came loose. But I bet it's not a plug, but the TPMS radio module crapped out.

 

FYI in case it is the BCM - which is no longer available as a new item AFAIK- there's an outfit that can repair / rebuild it.

https://www.g7computers.com/

They can repair and rebuild BCM, ECMs, etc all the computers, and they advertise overnight turnaround.

Good to know.

 

Replacing the TPMS Antenna P/N 40740-1NC2A (actually it's the 315 MHz radio transceiver for the TPMS system, not just an antenna) and then using my OBD II dongle + cellphone/bluetooth to clear the codes took care of the issue.

TPMS light is off now. If I get around to it, I will bleed a tire down to 22 PSI to see if it triggers a LOW TIRE PRESSURE alert. TPMS is a pain but it's a good system, might not be a bad idea to verify it is actually working.

Here's what's inside P/N 40740-1NC2A the gold metal structure is the 315 MHz antenna, the radio-frequency electronics are under that rectangular metal shield.


================================================== ================================================== ================================================== ===========
BONUS! BONUS!
When I pulled the panel off that is behind the glove box to get at this TPMS Radio module, I heard a "plink" sound as something fell out onto the plastic glove box which was sitting on passenger side floor as I was working. I found what looked like part of a plastic sprue - some molding piece from one of the car's plastic panels that would normally be cut off during assembly- kind of a rod like thing about an inch long with a fractured cut on one end and kind of a melty glob on the other. Looks like something that fell or otherwise got into my car when they were building it.
Afterwards, an annoying clicky sound that I used to hear driving over potholes and bumps was GONE. The factory-installed RATTLE came out, apparently. It was kind of way in there kind of near the cabin air filter, so it was muffled behind the panels and glovebox, so it wasn't loud- but you know how it is when your car is MOSTLY SILENT except for that ONE LITTLE RATTLE..... well it's gone now. I am almost happier about that than I am about fixing the TPMS.

G37 P/N 40740-1NC2A TPMS radio unit

 

Thanks for reporting back on your successful fix. I agree the TPMS is a good thing to have. It caught a cut tire for me once and I was able to get off the highway and roll into a station before the tire came apart. Gave me an alert the other day when the weather got cold and the tire pressure dropped below the threshold. I topped them up and it reset itself.

Nice that for your troubles you also got rid of an annoying rattle! That makes me want to pull that panel off just to have a look...

 

Thanks for the update. Only question I have: when you replaced the TPMS unit, did you have to calibrate your wheel sensors or was that process automatic?

 

No, I just cleared the codes using my OBD II tool and it was fine. I drove around for 30 minutes or so and then later another 30 minutes and all seemed well. No TPMS yellow warning light, OBD II codes all "OK."