No crank, just a click.

dpacheco59 · Apr 4, 2015

I would be so passed if it was just that, but it's a new battery. So Idk

dpacheco59 · Apr 7, 2015

Update: the guy who I had look at it cleared those codes with his fancy a$$ scan tool. And it started!?

signalnc · Apr 8, 2015

wow. any clue as to why it wouldn't start with the codes in it?

dpacheco59 · Apr 8, 2015

No clue. But now it won't start again. Security light, and "service air bag" lights are back on.

Hatchet · Apr 8, 2015

Have you checked you battery grounds?

dpacheco59 · Apr 8, 2015

Yes, He came back and rescanned it, now it comes up with B0951 B1000 B1397 B2585 B3810 under the bcm. the B1000 is about the ECU, but there is no codes past or present in the ECU...

Mooseman · Apr 9, 2015

OK, let's analyze this fully first:

B0951: Dimming Circuit
B1000: ECU Malfunction
B1397: Power Door Unlock Circuit Short To Battery
B2585: Parklamp Control Circuit Malfunction
B3810: Washer Relay Circuit

If I were a betting man, I'd say your BCM is toast. Security light is on probably because the PCM can't communicate with the BCM properly. If you do replace the BCM, either you will have to get it reprogrammed with your options and VIN or if you can get a BCM from another Envoy with the exact same options as yours, you could get away with just a security relearn that you can do yourself.

swede · Apr 9, 2015

You can try with any other BCM just to see if it fix the problem. The BCM you try with doesn't have to have all your options just to check if it start. I been playing numerous hours with different BCM on my TB so I know all about it.
Also if your battery voltage get to low there is a possibility that all your wired DTC comes from low voltage

dpacheco59 · Apr 10, 2015

Yeah I hope it's not toast. I'm gonna rip up the dash and check for shorts or anything like that.

Mooseman · Apr 10, 2015

You should be able to find a BCM cheap if you have a pick-a-part yard nearby. Even a regular yard shouldn't be that expensive.

dpacheco59 · Apr 10, 2015

Mooseman said:
You should be able to find a BCM cheap if you have a pick-a-part yard nearby. Even a regular yard shouldn't be that expensive.

if I buy a used one, and I want to flash my stuff on there can I do that to a used one?

Mounce · Apr 10, 2015

Yessir

Mooseman · Apr 10, 2015

Yes but try it first. before spending money getting it flashed. When you put it in, you'll have to do a security relearn.

dpacheco59 · Apr 11, 2015

Mooseman said:
Yes but try it first. before spending money getting it flashed. When you put it in, you'll have to do a security relearn.

got it. Just to make sure, it is
1. Leave key in ON position for 10min
2. Turn of for about 20sec
3. Repeat like 3-4 times
Right?

Mooseman · Apr 11, 2015

1. Attempt to start the truck by turning the key to the Start/Run position. Try to crank the vehicle.
2. Observe that the vehicle fails to start and the security light is illuminated.
3. Release key to the ON/RUN position (not the ACC position or OFF)
4. Allow the vehicle to sit with key in the ON/RUN position for no less than 11 minutes. Security light will turn off after this.
5. When the light goes off, turn key to OFF position and allow the vehicle to remain in the OFF position for no less than 30 seconds.
6. Repeat #1-#5 for four cycles or until vehicle starts.

dpacheco59 · Apr 11, 2015

Mooseman said:
1. Attempt to start the truck by turning the key to the Start/Run position. Try to crank the vehicle.
2. Observe that the vehicle fails to start and the security light is illuminated.
3. Release key to the ON/RUN position (not the ACC position or OFF)
4. Allow the vehicle to sit with key in the ON/RUN position for no less than 11 minutes. Security light will turn off after this.
5. When the light goes off, turn key to OFF position and allow the vehicle to remain in the OFF position for no less than 30 seconds.
6. Repeat #1-#5 for four cycles or until vehicle starts.

i better asks to make sure. But I can use a bcm from any year TB, Envoy, Bravada, Ascendar right? Or no?

swede · Apr 11, 2015

Yes but try it first. before spending money getting it flashed. When you put it in, you'll have to do a security relearn.

I didn't have to do the security relearn on my TB when I tried two different BCM (one from Swedish junk car and the one I got from Canada), I get the truck to start but the security light is illuminated on the dash.

The truck starts but to get the light to turn off I need to do the relearn.

i better asks to make sure. But I can use a bcm from any year TB, Envoy, Bravada, Ascendar right? Or no?

I would stick to 2002-2004 TB or Envoy to be sure

dpacheco59 · Apr 12, 2015

swede said:
I didn't have to do the security relearn on my TB when I tried two different BCM (one from Swedish junk car and the one I got from Canada), I get the truck to start but the security light is illuminated on the dash.

The truck starts but to get the light to turn off I need to do the relearn.

I would stick to 2002-2004 TB or Envoy to be sure

Does the color or numbers on the sticker matter? Here is mine.

Mooseman · Apr 12, 2015

The only thing that I heard of causing issues are BCMs coming from an LS without keyless entry. Maybe Swede can fill us in on that.

dpacheco59 · Apr 12, 2015

Went to a salvage yard. And found 2 and holy crap for the price I bought both!!! 14.99 each!?! I got one from a 05 envoy and the other from a 07 TB. I put the one from the envoy and did the relearn 3 times and BAM it started. My service airbag light is still on. I'm assuming because I need to flash it.

Sparky · Apr 12, 2015

I don't think the BCM has much to do with the airbags (I could be wrong). I would suspect that is something else. But glad you've seemed to have found the biggest problem! Would be nice if it already had all the options enabled on it as you had so you wouldn't have to reflash it.

Mooseman · Apr 12, 2015

Hopefully the flash will fix it because later years had more airbags the in 02. Same year and options would have been better and cheaper because stealership will probably charge an hour's work minimum. At least you got it going again.

dpacheco59 · Apr 12, 2015

Is there a way to find out if it does have all of them?
Yeah I wish they had an 02, but the 05 was the oldest one. They had 9 envoys and TB, I only found 2 modules....

Mounce · Apr 13, 2015

Way to find out if it has the same options? Yeah, go back to the vehicle you got it from and take a picture of the RPO code list sticker (white sticker with a bunch of 3 digit number/letter strings on it) in the glove box then compare it to yours then define the codes that are different online with a GM rpo decoder. Not all of the codes pertain to what the BCM controls so some differences like gear ratios and such won't matter.

dpacheco59 · Apr 15, 2015

Okay, today the tech at my new job told me that in order for the flash to work, you have to get the same part number on the new bcm, is this true? or will the flash work even if not. he said flashing is pretty much just restarting the computer..?

Mooseman · Apr 15, 2015

I don't think so because the Swede has been flashing like crazy on all sorts of BCM's. Hopefully he can answer that one. A problem could be possible with the year.

swede · Apr 16, 2015

dpacheco59 said:
Okay, today the tech at my new job told me that in order for the flash to work, you have to get the same part number on the new bcm, is this true? or will the flash work even if not. he said flashing is pretty much just restarting the computer..?

You have 2 different p/n on your BCM. One on the BCM (sticker outside) and a p/n on the software inside. All the BCM I been playing with on my TB did had the same outside p/n. The inside software p/n i been changing like crazy from all kind of different TB and envoys. Never effected my truck and always started even without doing the security relearn (the security light been on in the dash) but the truck started.

dpacheco59 · Apr 16, 2015

Yeah the 3 bcm I have are all different numbers outside

swede · Apr 17, 2015

dpacheco59 said:
Yeah the 3 bcm I have are all different numbers outside

Honestly I can't tell you if it works on a BCM with different hardware p/n. I know when I flash my modules it looks for the hardware p/n and if it's not the correct hardware p/n for the software p/n I can't flash it.

I had that problem with my DDM trying to flash it with a software designed for a different hardware (I have electric folding mirror, other truck not so different p/n modules).

dpacheco59 said:
Does the color or numbers on the sticker matter? Here is mine.

0412150756-1.jpg

You have the same p/n on your BCM like I do on mine. I don't know what the color means, I just went on the p/n when it came to my truck.

Mooseman said:
The only thing that I heard of causing issues are BCMs coming from an LS without keyless entry. Maybe Swede can fill us in on that.

The keyless entry is in the LGM not the BCM, you have to different LGM = with or without keyless entry

dpacheco59 said:
Okay, today the tech at my new job told me that in order for the flash to work, you have to get the same part number on the new bcm, is this true? or will the flash work even if not. he said flashing is pretty much just restarting the computer..?

Not really, when flashing you reinstall the full software program or install an updateded version of the OEM software.

dpacheco59 · Apr 17, 2015

swede said:
Honestly I can't tell you if it works on a BCM with different hardware p/n. I know when I flash my modules it looks for the hardware p/n and if it's not the correct hardware p/n for the software p/n I can't flash it.

I had that problem with my DDM trying to flash it with a software designed for a different hardware (I have electric folding mirror, other truck not so different p/n modules).

You have the same p/n on your BCM like I do on mine. I don't know what the color means, I just went on the p/n when it came to my truck.

The keyless entry is in the LGM not the BCM, you have to different LGM = with or without keyless entry

Not really, when flashing you reinstall the full software program or install an updateded version of the OEM software.

so as long as the P/N number matches, and not the numbers under the barcode, it will flash?

swede · Apr 18, 2015

so as long as the P/N number matches, and not the numbers under the barcode, it will flash?

Yes if the P/N 09352135 are the same it should flash, at least all of my 3 different ones flashed ok (same p/n but different trucks).

dpacheco59 · Apr 26, 2015

UPDATE:
So i bought a matching part number BCM, and installed it. no service airbag light or anything, runs fine. So i don't think i will be flashing it! thanks for all the help everyone!

No crank, just a click.

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