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TCU Fuse and SOS malfunction

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Old 02-26-2022, 04:38 PM
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Default TCU Fuse and SOS malfunction

So I’m looking to see if anyone on here has experienced this issue before.

just picked up an 08 328i, the previous owner told me the SOS malfunction started happening a few weeks ago.

Now, fuse #37 5A (which I believe is labeled as phone?) keeps blowing the instant it’s plugged in. I popped a 10A (I know not the smartest thing to try) and it popped as well. Am I right in assuming that this blown fuse could be causing the SOS malfunction? I’m thinking the circuit is either shorted to ground only god knows where, or maybe the TCU has failed?

Any info or pointers would be greatly appreciated!
Old 02-26-2022, 04:58 PM
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Please buy yourself a BMW code reader. I've seen them as low as $45 even.
Old 02-27-2022, 04:38 AM
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Originally Posted by donpb
Please buy yourself a BMW code reader. I've seen them as low as $45 even.
I have the iPhone Carly app, BimmerGeeks standard tools, and am currently downloading ISTA-D and ISTA-P

Here are the codes that Carly spits out, there are a lot of CAN Low line faults, but I figured chasing the cause of the blown fuse would be a good first step.
Airbag Crash Safety Module
00C944 Bus line fault - general. / K-CAN line fault - general
0093F9 Voltage energy reserve U60 n.i.O. / ZK18 / headrest driver
Instrument Cluster
00A554 Alive error phone / Live phone
00E104 Can low error / CAN error wire Fault
Light
00E504 Bus line fault K-CAN / CAN low, physical error / Physical CAN bus communication
Car Access System
00D904 K CAN line fault / K CAN LOW SYS, physical bus error D904
Sunroof
00DA04 Error K CAN LOW
iDrive CCC
00E184 K-CAN line fault / CAN low, physical bus error / CAN high / low-line error.
00E18D Awakening device has unsuccessfully tried to wake the network times. 3 (error wakeup failed).
Central Control Unit
00E2C4 Bus low line fault / Bus line fault CAN / Error physical CAN errors
Seat Electronics
00E484 K-CAN: bus line fault / CAN low, physical bus error
Gateway
00C904 K can low line / CAN low, physical error
Tire Pressure Control
00D104 Error CAN low / Error CAN single wire
Passive Go System
00D2C4 K can low / K CAN line failure
Interior protection
00D944 CAN physical errors: solid / K-can physical error
Central Electronics
00E584 Unfortunately, no error text available / CAN low, physical error / K can short / Bus line fault KCAN
Old 02-27-2022, 10:44 AM
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Originally Posted by donpb
Please buy yourself a BMW code reader. I've seen them as low as $45 even.
I have the iPhone Carly app, DimmerGeeks Standard Tool, and am currently installing ISTA-P and ISTA-D. When scan the car, I get a lot of CAN Low faults, as well as the fault for the phone. I just figured finding the short for the phone would be a good first step.

Here are the codes the car currently has when I run a Carly scan :
Airbag Crash Safety Module
00C944 Bus line fault - general. / K-CAN line fault - general
0093F9 Voltage energy reserve U60 n.i.O. / ZK18 / headrest driver
Gear Lever
00A830 Reset system: lever could not be postponed / Reset system lacks way
Instrument Cluster
00A554 Alive error phone / Live phone
00E104 Can low error / CAN error wire
Central Info Display
00E5C4 K-CAN error / K-CAN bus / K CAN line fault / Communication: can low
Light
00E504 Bus line fault K-CAN / CAN low, physical error / Physical CAN bus communication
Car Access System
00D904 K CAN line fault / K CAN LOW SYS, physical bus error D904
Sunroof
00DA04 Error K CAN LOW
iDrive CCC
00E184 K-CAN line fault / CAN low, physical bus error / CAN high / low-line error
00E18D Awakening device has unsuccessfully tried to wake the network times
00E18F Central registry does not match the target configuration (error registry new)
Central Control Unit
00E2C4 Bus low line fault / Bus line fault CAN / Error physical CAN errors
Seat Electronics
00E484 K-CAN: bus line fault / CAN low, physical bus error
Gateway
00C904 K can low line / CAN low, physical error
Tire Pressure Control
00D104 Error CAN low / Error CAN single wire
Passive Go System
00D2C4 K can low / K CAN line failure
Interior Protection
00D944 CAN physical errors: solid / K-can physical error
Central Electronics
00E584 Unfortunately, no error text available / CAN low, physical error / K can short / Bus line fault KCAN
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