Telematics Control Unit Help

Minton444 · 10-18-2021, 01:19 PM

Has anyone taken apart their TCU and fix whatever made it go bad? I was given two and yup they are both bad so now I have three of these' including my original, so I don't care about opening one and trying to fix it. Why you ask? Why not! I have three dead ones. Any help would be great.

im_an_alien · 10-18-2021, 05:20 PM

Maybe there is an underlying problem, all those TCUs bad? What are your symptoms?

Minton444 · 10-18-2021, 05:32 PM

Quote:

Originally Posted by im_an_alien

Maybe there is an underlying problem, all those TCUs bad? What are your symptoms?

The car won't communicate with the module. I did a multimeter test on to connector and all the fuses and Everything is great there. I then checked the green fiber optic cable and it is omitting a red light. I then checked to see if the module was sending a red light back but it's not. I then connected ista and the amp and the cdc is showing no communication. I then put a fiber loop onto the green cable and then checked ista and that fixed the problem with the amp and the cdc but the tel/mulf still showed no commutations. Now I did that with all three modules which were given to me for free. With all that being said I have determined that the modules are bad. I figured if someone had fixed one before if they would talk me through it I would try to fix it.

BimR · 10-18-2021, 06:17 PM

I think the 3 free ones might be the problem 🤣. Hopefully someone has taken them apart and can help. That is one finicky module.

dmaxdmax · 10-19-2021, 07:07 AM

Did you replace the battery? That's all mine needed when it went bad...this was in a 2016 340i xd. You're not talking about your 2006, or are you?

Minton444 · 10-19-2021, 07:21 AM

Quote:

Originally Posted by dmaxdmax

Did you replace the battery? That's all mine needed when it went bad...this was in a 2016 340i xd. You're not talking about your 2006, or are you?

It's in my 2006 and no I didn't replace the battery

dmaxdmax · 10-19-2021, 08:05 AM

Quote:

Originally Posted by Minton444

It's in my 2006 and no I didn't replace the battery

That might be a good place to start, assuming yours, like mine, has a battery. It should--it's made to call someone in the event of an accident, where the battery of the car would be cut off by the bst.

No idea where yours is--was in the TIS for mine while the TIS was still up...

2017F30 · 10-19-2021, 12:27 PM

My vehicle’s telematics control unit failed and was replaced at 14,251KM (8,900 miles) which is shockingly premature.

10-18-2021, 01:19 PM	#1
Minton444 Private 8 Rep 81 Posts Drives: 2006 525xi e60 Join Date: Aug 2021 Location: Columbus, Ohio iTrader: (0)	Telematics Control Unit Help Has anyone taken apart their TCU and fix whatever made it go bad? I was given two and yup they are both bad so now I have three of these' including my original, so I don't care about opening one and trying to fix it. Why you ask? Why not! I have three dead ones. Any help would be great.
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10-18-2021, 05:20 PM	#2
im_an_alien Major 1122 Rep 1,496 Posts Drives: 2016 340i Join Date: Jul 2019 Location: Florida/NH iTrader: (0)	Maybe there is an underlying problem, all those TCUs bad? What are your symptoms?
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10-18-2021, 06:17 PM	#4
BimR Lieutenant 245 Rep 500 Posts Drives: 2016 328 Join Date: Sep 2020 Location: New York iTrader: (0)	I think the 3 free ones might be the problem 🤣. Hopefully someone has taken them apart and can help. That is one finicky module.
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10-19-2021, 07:07 AM	#5
dmaxdmax Captain 417 Rep 923 Posts Drives: 2016 M235i 6-spd Join Date: Jan 2020 Location: New Jersey iTrader: (0)	Did you replace the battery? That's all mine needed when it went bad...this was in a 2016 340i xd. You're not talking about your 2006, or are you? __________________ '92 325i, '99 328i, '16 340i, '16 M235i all manuals dmax on FB My last pre-covid standup set
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10-19-2021, 12:27 PM	#8
2017F30 Private First Class 42 Rep 115 Posts Drives: 2017 330iX AT Join Date: Feb 2021 Location: Toronto, ON iTrader: (0)	My vehicle’s telematics control unit failed and was replaced at 14,251KM (8,900 miles) which is shockingly premature.
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