Short story: my car has been at chevy dealer for 3 months due to issue of car starts and runs but locks doors, all controls wont work, dash posts all service system messages. I would unhook battery to clear codes and start car few minutes after it would reoeat condition. Service dept says its my sercurity keyless computor i believe they called it an rcm. They said its nolonger made must be bought either used or refurbished.they bought one and installed, it wouldnt work and they couldnt flash it.when they reinstalled my original it went back into a supposed limp mode. They said it does communicate with the bcm but not correctly and they cant access it. They tried another and it failed as well. Im affraid they might say they cant fix it. They said they need a refurbished one thats not beed flashed. I dont know what to do is there a place to get one? The car probably would drive but i was affraid with all service codes posting and doors,windows and controls wont work. It is a manual base model z51.could that have anything to do with part replacement as most cars are automatic ? Any help or suggestions are welcome.

 

The module is a RCDLR, or remote control door lock receiver, and what receives the Fob and TPMS singnals, and sends that information to the BCM for it needs.

On the RCDLR, when you flash it in to the car, it has be flashed in as new device (replaced and firmware flashed, not just firmware flashed option), so it can marry to the BCM with the correct security code number. Hence the SPS replace and flash option goes through all the modules in the car, so to make they are all flashed correctly to the Vin BCM secuirty code.

So either the replacement modules are bad,
or they did not use the "replace and firmware flash option so the RCDLR is correctly security code matched to the BCM (just used firmware update option),
or someone put an after "locked tune" in the car, which changes the OEM secuirty code and they can not their MDI using TDS to commitment with the BCM in the first place.

So on that note, would check to make sure that the last two are not the problem, and it really is that the used modules are the problem to start with. Hence have not had problems flashing in a used RDCLR to a car, so long as it was the correct one to start with and not a defective one in first place.

Also, going to add another one to this, and if they can get the RCDLR firmware flash correctly with the needed securtiy code, can get it to learn the TPMS, but will not learn the fobs, that is a different problem instead.
In the glove box slot, there is an antenna that has to be in the correct location for it to be able to learn a fob.

If #12 antenna pops out of it receiver slot next to the glove box slot, and is now laying in the bowels of the dash (second photo), it will not be close enough to the glove box slot to pick up the fob correctly to all it to be programmed in to the RCDLR.




Hence dead give away on a replacement RCDLR is the tpms use different antenna;s, so they can be learned fine, while the Fob can not be found during its learning instead.

As for the used RCDLR, its a crap shoot right now, since some have been pulled for being defective in the first place, and being sold off as still good. Myself, since the original one has already programmed in, just too easy to pull it apart to fix the problem it has isntead. 90% of the time, its just a cold solder joint on the connector header pins the problem and just need to be re-soldered to resolve the colder solder joint problems.


And if you look at the bottom of the board where the long connector head pins are soldered into it, littered with cold solder joint from the factory that was the problem with this board.


As for the other 5% of the time, its either one of the relays that need to be replace (white axicom devices), or car was driven on rough roads too much to cause the a CPU leg to come un-soldered (under the 215 NA heat shield that has the orange sticker), while the last 5%, water damage corrosion that takes out too many of the traces on the board to repair it instead.

You don't list your location, but if in the Denver area, more than welcome to come over with the RCDLC to see if its a problem that I can resolve on it.

 

Thankyou for the info, i will send this to the dealership to see if it helps. Im from Tennessee definitally wish we were closer. Question: can you repair and flash these? Or do you have refurbished ones? If the dealership cant fix mine like you suggested maybe they could send you mine if you refurbish these.

 

I just got the car back, so both the bcm and rcdlr were bad. How it happened i dont know. The dealership had gotten bcm replaced and flashed BUT the big issue after was finding an rcdlr. They got two different ones the first ( all used mind you) was just bad the second would communicate with bcm but they couldnt access it to flash it so again bad or locked. I got lucky and on ebay found a new un used rcdlr that was for the cadillac xlr which is same part.they managed to flash it and fix the car. They had to change both key fobs to newer style like c7 the hatch button wont work but everything else does.my car is a z51 2005 and i dont know if this is just my singular situation with c6 but ill tell you they had my car 6 months because the rcdlr. They dont make them anymore not even after market and i called every corvette salvage yard on the internet every corvette aftermarket company everything you could think of to find one. I couldnt even find a repair shop that could refurbish it so like i said if it was just my gremlin its finally fixed but if not i hope non of you ever have this issue because they dont make that rcdlr.

 

Glad you finally got it repaired but what a freaken horror show! One stinken inexpensive part could cause that much trouble is crazy in that you can’t buy it anymore! It's one thing where on old classic cars you can have something made at places that specialize in that work. Yea it’s expensive but at least you can get the part made you need... but not with that RCDIR! I’ve got an 06 and think I’ll start looking around now for one of those just in case..... Anyway 6 month is nuts but sounds like without that part working properly you own a nice 3200 lb anchor!