M56 BCM swap

Post by **Pakitullanc** » Tue Sep 14, 2021 6:21 am

Where is the BCM located?
Has anyone done it that can help me with directions.
Thx

Post by **VStar650CL** » Tue Sep 14, 2021 6:52 am

It's mounted vertically to the left of the steering column. HOWEVER, IT IS NOT PLUG AND PLAY AND YOU CANNOT REPLACE IT WITOUT A CONSULT3+ OR EQUIVALENT SCANNER.

1) First the configuration must be read from the existing BCM, then restored after replacement
2) Then the vehicle keys must be reprogrammed:
* For a new BCM, old/existing keys must generally be reprogrammed first and then any new ones added. If new keys are programmed first, all the old ones may become permanently unusable.
* For a used BCM, ONLY new keys can be used. Existing/old keys are NOT usable in any way with a used BCM
3) The TPMS sensors may need to be re-registered (this varies from model to model)

Post by **Pakitullanc** » Tue Sep 14, 2021 7:40 am

VStar650CL wrote: ↑
Tue Sep 14, 2021 6:52 am
It's mounted vertically to the left of the steering column. HOWEVER, IT IS NOT PLUG AND PLAY AND YOU CANNOT REPLACE IT WITOUT A CONSULT3+ OR EQUIVALENT SCANNER.

1) First the configuration must be read from the existing BCM, then restored after replacement
2) Then the vehicle keys must be reprogrammed:
* For a new BCM, old/existing keys must generally be reprogrammed first and then any new ones added. If new keys are programmed first, all the old ones may become permanently unusable.
* For a used BCM, ONLY new keys can be used. Existing/old keys are NOT usable in any way with a used BCM
3) The TPMS sensors may need to be re-registered (this varies from model to model)

I have been without interior lights for a while. Issue happened when I was replacing interior leds without disengaging the battery. Fuse are all good. Interior lights come on when you press the dome light button but footwell lights don't come on.

All signs point towards a blow bcm. I found a used one for $50 and new for $100. So I have to replace keys and then buy a consult3 because I am thinking dealership is not going to be programming for me if they did not do the install. What do you suggest

Post by **VStar650CL** » Tue Sep 14, 2021 11:00 am

New for $100 is a super-duper deal, but installing it yourself isn't because the config needs to be saved from your existing one before it comes out. Most places don't object to installing customer parts, you just won't get a materials warranty. I'd call around and ask questions. You're not limited to Infiniti dealers, any Nissan place can do it too.

Post by **Pakitullanc** » Tue Sep 14, 2021 11:20 am

Ok, thanks

Post by **reggiebrown40** » Tue Sep 14, 2021 7:19 pm

Pakitullanc wrote: ↑
Tue Sep 14, 2021 7:40 am

VStar650CL wrote: ↑
Tue Sep 14, 2021 6:52 am
It's mounted vertically to the left of the steering column. HOWEVER, IT IS NOT PLUG AND PLAY AND YOU CANNOT REPLACE IT WITOUT A CONSULT3+ OR EQUIVALENT SCANNER.

1) First the configuration must be read from the existing BCM, then restored after replacement
2) Then the vehicle keys must be reprogrammed:
* For a new BCM, old/existing keys must generally be reprogrammed first and then any new ones added. If new keys are programmed first, all the old ones may become permanently unusable.
* For a used BCM, ONLY new keys can be used. Existing/old keys are NOT usable in any way with a used BCM
3) The TPMS sensors may need to be re-registered (this varies from model to model)
I have been without interior lights for a while. Issue happened when I was replacing interior leds without disengaging the battery. Fuse are all good. Interior lights come on when you press the dome light button but footwell lights don't come on.

All signs point towards a blow bcm. I found a used one for $50 and new for $100. So I have to replace keys and then buy a consult3 because I am thinking dealership is not going to be programming for me if they did not do the install. What do you suggest

Did you smell burning when the lights went out? I'm asking because when it happened to me it burned the wiring inside the harness. I bought a used one for 250 and the dealer installed it for another 100 or so, so I got lucky. I just want you to be aware that it's not always the BCM alone. Sometimes wires get fried.

Post by **Pakitullanc** » Tue Sep 14, 2021 8:04 pm

reggiebrown40 wrote: ↑
Tue Sep 14, 2021 7:19 pm

Pakitullanc wrote: ↑
Tue Sep 14, 2021 7:40 am

I have been without interior lights for a while. Issue happened when I was replacing interior leds without disengaging the battery. Fuse are all good. Interior lights come on when you press the dome light button but footwell lights don't come on.

All signs point towards a blow bcm. I found a used one for $50 and new for $100. So I have to replace keys and then buy a consult3 because I am thinking dealership is not going to be programming for me if they did not do the install. What do you suggest
Did you smell burning when the lights went out? I'm asking because when it happened to me it burned the wiring inside the harness. I bought a used one for 250 and the dealer installed it for another 100 or so, so I got lucky. I just want you to be aware that it's not always the BCM alone. Sometimes wires get fried.

I did smell any burn. But do you have the info on the harness. I tried to look but could not find it.

Post by **conaigh** » Tue Jan 18, 2022 7:59 am

reggiebrown40 wrote: ↑
Tue Sep 14, 2021 7:19 pm

Pakitullanc wrote: ↑
Tue Sep 14, 2021 7:40 am

I have been without interior lights for a while. Issue happened when I was replacing interior leds without disengaging the battery. Fuse are all good. Interior lights come on when you press the dome light button but footwell lights don't come on.

All signs point towards a blow bcm. I found a used one for $50 and new for $100. So I have to replace keys and then buy a consult3 because I am thinking dealership is not going to be programming for me if they did not do the install. What do you suggest
Did you smell burning when the lights went out? I'm asking because when it happened to me it burned the wiring inside the harness. I bought a used one for 250 and the dealer installed it for another 100 or so, so I got lucky. I just want you to be aware that it's not always the BCM alone. Sometimes wires get fried.

Hey, can't PM yet, can you PM me? It's about a part out post you had up from a bit ago

Post by **reggiebrown40** » Sat Jan 22, 2022 10:55 am

VStar650CL wrote: ↑
Tue Sep 14, 2021 6:52 am
It's mounted vertically to the left of the steering column. HOWEVER, IT IS NOT PLUG AND PLAY AND YOU CANNOT REPLACE IT WITOUT A CONSULT3+ OR EQUIVALENT SCANNER.

1) First the configuration must be read from the existing BCM, then restored after replacement
2) Then the vehicle keys must be reprogrammed:
* For a new BCM, old/existing keys must generally be reprogrammed first and then any new ones added. If new keys are programmed first, all the old ones may become permanently unusable.
* For a used BCM, ONLY new keys can be used. Existing/old keys are NOT usable in any way with a used BCM
3) The TPMS sensors may need to be re-registered (this varies from model to model)

This wasn't true in my case. I provided a used BCM and the dealer programmed my existing keys without issue.

Post by **Pakitullanc** » Sat Jan 22, 2022 11:04 am

Did you have the inside lights out because of led swap?

Post by **VStar650CL** » Sat Jan 22, 2022 11:48 am

reggiebrown40 wrote: ↑
Sat Jan 22, 2022 10:55 am
VStar650CL wrote: ↑
Tue Sep 14, 2021 6:52 am
It's mounted vertically to the left of the steering column. HOWEVER, IT IS NOT PLUG AND PLAY AND YOU CANNOT REPLACE IT WITOUT A CONSULT3+ OR EQUIVALENT SCANNER.

1) First the configuration must be read from the existing BCM, then restored after replacement
2) Then the vehicle keys must be reprogrammed:
* For a new BCM, old/existing keys must generally be reprogrammed first and then any new ones added. If new keys are programmed first, all the old ones may become permanently unusable.
* For a used BCM, ONLY new keys can be used. Existing/old keys are NOT usable in any way with a used BCM
3) The TPMS sensors may need to be re-registered (this varies from model to model)
This wasn't true in my case. I provided a used BCM and the dealer programmed my existing keys without issue.

For I-keys it's true except for a few very early versions. For steel keys it isn't, and I should have made note of that. My bad.

Post by **DoN_BLaZe34** » Sat Jan 22, 2022 4:26 pm

VStar650CL wrote: ↑
Sat Jan 22, 2022 11:48 am

reggiebrown40 wrote: ↑
Sat Jan 22, 2022 10:55 am

This wasn't true in my case. I provided a used BCM and the dealer programmed my existing keys without issue.
For I-keys it's true except for a few very early versions. For steel keys it isn't, and I should have made note of that. My bad.

Hey VStar, question for you. The welcome lighting on my '17 Q70L stopped working meaning the dome light and door handle lights don't come on as you approach the car...the odd thing is the lights still come on whenever I lock, unlock, or open the doors but. Does this sound like my BCM is on the fritz? Any thoughts or insight, big or small, would be great. Thanks in advance.

Post by **VStar650CL** » Sat Jan 22, 2022 5:44 pm

Sounds like your fob battery is low. The BCM detects you by interrogating the door handle antennas for fob signals. The door request uses the same very high frequency (2.4 GHz, I think) as the in-car antennas, and those signals don't have much range to begin with. When the fob battery runs low it pretty much goes to nothing.

Post by **DoN_BLaZe34** » Sat Jan 22, 2022 7:43 pm

Funny, I had the same thought, changed the battery out, and still no dice. Everything works except the welcome lighting.

Post by **VStar650CL** » Sat Jan 22, 2022 8:35 pm

Check your menu to make sure the settings didn't get corrupted, I'm pretty sure that's a configurable item. If it's turned on, check to make sure the replacement fob battery is any good, lithiums do self-discharge when left in a drawer or on the store shelf for too long. "Healthy" is above 3V, 3.0V and lower is a dying horse. Check the "fingers" on the PCB for good contact with the top of the coin, also.

Post by **DoN_BLaZe34** » Mon Jan 24, 2022 9:58 am

Appreciate the suggestions, still no dice thus far. Everything works except door handle leds and the map lights when approaching the car.

Post by **reggiebrown40** » Mon Jan 24, 2022 10:00 am

Pakitullanc wrote: ↑
Sat Jan 22, 2022 11:04 am
Did you have the inside lights out because of led swap?

Yes. I popped the BCM and some internal wiring when I tried to change out the bulbs.

R

Post by **reggiebrown40** » Mon Jan 24, 2022 10:17 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:00 am

Pakitullanc wrote: ↑
Sat Jan 22, 2022 11:04 am
Did you have the inside lights out because of led swap?
Yes. I'll answer all of your questions. I popped the BCM and some internal wiring when I tried to change out the bulbs.The interior lights no longer came on on their own, only when manually pushed. The harness has a wire (green) that ends up being burned when this occurs. The tech replaced the BCM and traced the burned wire in the loom and resoldered it so it had continuity. Other members have had different components replaced. The tech ended up telling me that the BCM didn't need to be replaced because the old one was fine. Since he had already paired to the new BCM I didn't push it.

Some dealers are good about finding the burned wires. Others will try to charge you about 3 grand for the entire wiring harness. I guess I got lucky.

R

Post by **reggiebrown40** » Mon Jan 24, 2022 10:21 am

VStar650CL wrote: ↑
Sat Jan 22, 2022 11:48 am

reggiebrown40 wrote: ↑
Sat Jan 22, 2022 10:55 am

This wasn't true in my case. I provided a used BCM and the dealer programmed my existing keys without issue.
For I-keys it's true except for a few very early versions. For steel keys it isn't, and I should have made note of that. My bad.

Not sure what you're saying here. Please explain.

Post by **reggiebrown40** » Mon Jan 24, 2022 10:25 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:00 am

Pakitullanc wrote: ↑
Sat Jan 22, 2022 11:04 am
Did you have the inside lights out because of led swap?
Yes. I (thought)popped the BCM and some internal wiring when I tried to change out the bulbs.

R

Post by **reggiebrown40** » Mon Jan 24, 2022 10:26 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:25 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:00 am

Yes. I (thought) I popped the BCM and some internal wiring when I tried to change out the bulbs.

R

Post by **Pakitullanc** » Mon Jan 24, 2022 10:28 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:21 am

VStar650CL wrote: ↑
Sat Jan 22, 2022 11:48 am

For I-keys it's true except for a few very early versions. For steel keys it isn't, and I should have made note of that. My bad.
Not sure what you're saying here. Please explain.

I went to the dealership with a BCM specific to my vin and the car won't start. They reprogrammed the keys and same result. One member here had to have a harness replaced. I am thinking that is what I need. The harness is $700. That is what is holding me back. I too blew my BCM while swapping leds

Post by **VStar650CL** » Mon Jan 24, 2022 12:24 pm

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:21 am

VStar650CL wrote: ↑
Sat Jan 22, 2022 11:48 am
For I-keys it's true except for a few very early versions. For steel keys it isn't, and I should have made note of that. My bad.
Not sure what you're saying here. Please explain.

Steel keys are ones you stick in the ignition and turn, they only use RFID and are reusable if you swap BCM's. I-keys are ones you can keep in your pocket and start the car, and all the late-model ones mate with the BCM and become unusable if you swap for a used BCM (but they can be mated to a new replacement).

Post by **reggiebrown40** » Mon Jan 24, 2022 4:03 pm

VStar650CL wrote: ↑
Mon Jan 24, 2022 12:24 pm

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:21 am

Not sure what you're saying here. Please explain.
Steel keys are ones you stick in the ignition and turn, they only use RFID and are reusable if you swap BCM's. I-keys are ones you can keep in your pocket and start the car, and all the late-model ones mate with the BCM and become unusable if you swap for a used BCM (but they can be mated to a new replacement).

Ok, understood. You're referring to a key not used by the Q70/M56, but maybe <2002 Q45 year vehicles with chips in the housing of the key. Intelligent Keys are programmable with used BCMs. I had both of my keys paired to a used bcm when I thought I had fried the original bcm. Where did you hear that they can't be paired?

Post by **VStar650CL** » Mon Jan 24, 2022 4:21 pm

The I-keys on Nissans were only reusable up until about '08, but with the M's being sort of a "specialty car", Infiniti may not have seen any point in revamping the original system. Look at how long the Z's went with no meaningful changes to the electronics!

Post by **reggiebrown40** » Mon Jan 24, 2022 5:10 pm

Pakitullanc wrote: ↑
Mon Jan 24, 2022 10:28 am

reggiebrown40 wrote: ↑
Mon Jan 24, 2022 10:21 am

Not sure what you're saying here. Please explain.
I went to the dealership with a BCM specific to my vin and the car won't start. They reprogrammed the keys and same result. One member here had to have a harness replaced. I am thinking that is what I need. The harness is $700. That is what is holding me back. I too blew my BCM while swapping leds

Ok, so your car used to start and then after you swapped the LED's it blew the BCM and now it won't start? If that's the case, you've got some major wiring damage or the replacement BCM is bad.

Post by **Pakitullanc** » Mon Jan 24, 2022 5:19 pm

Went back to the old BCM and the car starts but still no interior lights.

Post by **splitnails** » Sun Mar 13, 2022 7:56 pm

Damnit, add me to the list. I also smelt burning. FML.

Post by **Pakitullanc** » Mon Mar 14, 2022 5:28 am

I am going to install some tap lights, lol.

Post by **splitnails** » Mon Mar 14, 2022 6:21 am

What would y’all do?

M56 BCM swap

M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Re: M56 BCM swap

Nissan Forums

Infiniti Forums

Datsun Forums

Technical Forums

Classifieds / Marketplace

Nissan Motorsports

General Forums