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How to tell if BCM replacement?

Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
  • 2001 SATURN L300
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
How do I know which is bad my BCM or my ECU? It cranks and sounds like it wants to start, but it doesn't.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
CATAFINA
  • MECHANIC
  • 167 POSTS
This video will show you how to scan the CAN system its easier than you think.

https://youtu.be/InIlnsjOVFA

Please run down this guide and report back.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Do you have any codes? Even if the check engine light is not on do a scan as not all faults will set a check light.
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+7
Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
The check engine and service light does stay on and now the no security light is on as well. I can't read any codes because the code reader says it cannot connect.
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+9
Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Do you have gas gauge, fuel gauge, power locks keyless entry, can't get out of park etc? Please give any symptoms?
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
I don't have keyless entry. And my gauge is on E and the gas light is on and I know that I have at least a half tank. Yes, I can move it out of park.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If it is not running your check engine light will be on and service light as well. With the gas gauge not operational and the security light is on it sounds like a bad bcm. I have seen bad bcms cause you not be able to link to the ecms on those cars. The fuel gauge operational and not starting is a common symptom on those cars when the bcm's go bad. I replaced a lot of bad bcm's on those cars when I worked at the Saturn dealership. I have tester bcm's for all the years saving all the old bcm's I replaced.I would just swap it for my tester and see if the symptoms changed to see if I had a bad bcm.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
The security light is not on. Just the check engine soon and service and my gas light. It was driving fine just a few days ago.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
With the gas gauge not operational and not starting plus not talking to the ecm you could have a bad bcm. I have replaced a lot of bcms for those exact same symptoms.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
Thank you I will let you know what happens.
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
AMBERWESTFL
  • MEMBER
  • 13 POSTS
  • 2001 SATURN L300
I found a body control module from a 2000 saturn and wanted to know if it was compatible with my 2001 saturn
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Wednesday, September 30th, 2020 AT 3:37 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Unable to furnish information on it-but if I were you check the dealership if its compatible
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-1
Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
EBay offers a repair service for bcms way cheaper and you don nott have to have the bcm programmed like if you replace the bcm.
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Just to add to that one the only bcm that will work on your 2001 L model V6 is a 2001 L model V6 engine. On the L model saturns it has to be the same year and has to be the same engine size as well. Also you need to be aware that the bcm has the mileage in it so changing the bcm will change the mileage. What ever mileage the donor car has on it your car will then have the same mileage. Your best bet is to get a new one and have the dealer replace it and program in the correct mileage and calibrations options etc. If you want I know of a good place to get a new bcm.
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
I replaced the bcm and still no start ;(
Now I smell gas and before I didn't. So I also checked my fuses and none of my ignition fuses light up I've even changed them. What would make all my ignition fuses not light up when tested?
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
AMBERWESTFL
  • MEMBER
  • 13 POSTS
Thank you, where would be a good place to purchase one?
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
When you say you replace the bcm, was it used or new? Also where was the bcm located?
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
AMBERWESTFL
  • MEMBER
  • 13 POSTS
I found one from a salvage place for $100 and plugged it in and the car started right up
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
MZ.JONES
  • MEMBER
  • 7 POSTS
It is a used one. The car I took it from was running before I took the bcm out. And it is on top behind the glove department on both cars. I'm stuck I haven't had the car but a few weeks, so I don't really know too much. However, when removing the bcm this car had had the bcm replaced before and there was black tape on the wires. I coud add pictures later today. But other than this its driven great just minor front end repair.
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Thats good just make sure you report the mileage change to the dmv and tell them why there was a mileage change.
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Wednesday, September 30th, 2020 AT 3:38 PM (Merged)

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