Engine Control Module/Body Control Module Replacement

Question for 1'st gen Tundras:

I'm interested in knowing whether I can replace ECMs/BCMs myself. I've seen online sources for reconditioned and VIN programmed Engine Control Modules as well as installation instructions. They are advertised as "plug and play." Is this correct?
I've also seen online sources for reconditioned Body Control Modules and instructions for programming key fobs, doors, etc. But, others tell me that BCMs must be dealer programmed. Is this correct?
I plan to keep a 1st gen Tundra in a remote area where it would be difficult to trailer it out for repair if there where an electronic component failure that prevented it from running and moving. I'f like to confirm that I could get it running and moving myself, if needed.
Also, are there any other electronic components to consider that might prevent the vehicle from running and moving if they fail?
Thanks in advance for any feedback!

 

Flagship One (FS1) sells ECM and is legit. And yes, it's very easy to swap out ECM if you take your time. You must check your part number in advance for the ECM, it's printed on the ECM itself, in the format of XXXXX-XXXXX (usually ending in '0C0' or similar).

BCM, you have a double cab, it seems? I don't know if "double door" means double cab or access cab to you, we don't call them "double door" or "crew cab" or "max cab", people seem to like to call it whatever they want. If you have a double cab, some double cabs had immobilization via BCM, and security through BCM instead of using TVIP, if I understand correctly - not all did though. If that's the case with yours, I presume some programming is required. But not all had that. Some used TVIP for security.

So, ECM yes, if it's either (A) matching part number or (B) a succession/supersession part number that is intended for use (FS1 would tell you that).
For BCM, I don't know, but I also can't remember in my 5ish years here, and time lurking before that, where I ever saw anyone report their BCM died or borked up.

I am not the definitive voice on this, and I hope others chime in. You may also be able to call FS1 and ask them about the BCM as you inquire about your ECM. They should be able to figure out your ECM part number based on your VIN also.

 

Thanks very much for the response. Very helpful.
I'm actually looking to buy a 1st gen double cab and don't own yet. This is the most practical configuration for my purpose.
I don't expect either the ECM or BCM to fail. But, want to know IF I can replace myself in remote area.
My understanding is 1st gen double cabs are 2005-2006. If immobilization is a "weak link" for my purpose, I would chose a different year/model to eliminate the potential concern.
Any other electrical components to consider that could disable the vehicle if failed?
Thanks again.

 

Double cabs started manufacture in late 2003 for sale as 2004 models, if I'm not mistaken.

What constitutes as a "weak link" depends on where the vehicle will be. i.e. if it's in a place with rodents, then you'll want a V6 to avoid nesting under the intake manifold and chewing up the starter/SAIP/knock sensor wiring, which means no double cab for you. If it's in a place with salt, the frame and LBJ are major weak links.

Let me ask you this: Have you read THIS THREAD yet?

 

I could tell you about the BCM... My 02 Celica lost half the electrical systems in the car. Car would run and drive, since it's completely separate from the engine. Most common failures with the BCM which appeared to be common on the 00-07 Celicas, Corolla's and Matrix/Vibe cars. If you lost, fuel gauge, power windows, brake lights/rear tail lights, license plate light, door locks and moon roof, rear speakers among other things.

 

Isn't ABS/VSC function managed through the BCM on the 1st gens? I wasn't sure earlier, but I swear VSC and the pitch/roll sensor are all managed through the BCM, which can cause some crazy shit if true.

This is one of those times I wish we had a @BubbaW signal we could throw up. He knows more about electrical and features on this truck than anyone I've ever seen on the internet.

 

Yes, more than likely, my Celica didn't have ABS so I'm pretty it is part of the BCM

 

Thanks. I saw the thread. But now have read it. Good info. I live in the South (TN) and would hope to find candidate truck with solid frame. Understand LBJs and timing belts as I have replaced on other vehicles.
My limited research for 1st gen immobilizers in only vehicles "from Canada." Appears all 1st gen manufactured in US.
So, do you think BCMs w/o immobilizer is self performed key fob/door lock programming?
Thanks again.

 

This forum has more than a couple threads where double cab owners in the US - we assume made in Indiana? - have security functions such as keyless through BCM. I didn't believe it when I saw it. What I don't know is ... are there trucks with keyless through the BCM that don't have immob? And others that have both thru BCM? I really don't know.