[OG Style]

I've got two fault codes on my car that I can't figure out. Does anyone know anything about them?

A731 Supply, terminal 30g_f
A0B1 Input, Selector-lever

Thank you

[E92William]

What issues are you having? The first code relates to one of the main terminals in the junction box which well runs all of the cars electronics. Second is for a clutch switch lever or whatever so really no idea here as I have an automatic

[OG Style]

I don't notice any problems. It just driving me crazy that I can't figure out why I have these codes.

[OG Style]

Does anyone have any ideas?

[gbalthrop]

Originally Posted by OG Style

I've got two fault codes on my car that I can't figure out...A731 Supply, terminal 30g_f; A0B1 Input, Selector-lever ...

Originally Posted by OG Style

I don't notice any problems. It just driving me crazy that I can't figure out why I have these codes.

What is the build date of your 2007 328i?
Does it have CA (Comfort Access)?
Does it have AT (Automatic Transmission as opposed to MT)?
What Scan Tool or Diagnostic Software such as INPA/ISTA do you have?
What Freeze Frame Data, Mileage/km, or Fault Details are read for each?
Has ANY Warning Light appeared on Instrument Cluster?

Depending upon answers to questions above, those codes COULD simply be due to a "hiccup" in the K-CAN Bus, which just occurs intermittently, and clearing and periodic Scan would be recommended. That is particularly true if you have CA Option. If NOT, and if you have AT, then there is concern about the cause & frequency of A0B1 code, as the CAS Module must get a signal from the Transmission that P/N is selected BEFORE CAS will send Voltage to the Starter Solenoid. If BOTH your Gear Indicator Light and Instrument Cluster Gear Selected show P or N when those are selected, then CAS should activate Starter when START button is pressed.

The A731 code relates to the "Bi-Stable" Relay which, when activated, powers ONLY the fuses shown in the diagram below for 2007 328i built AFTER 3/1/2007. That Bi-Stable Relay is IO1139 at the far-right of the diagram linked below, activating F17, 31, 33, 44, 58, 82, 86, NONE of which are necessary to basic operation of the vehicle:
https://www.newtis.info/tisv2/a/en/e...on-box/vVzY4e9

Learning to use TIS wiring diagrams can save a LOT of "Driving me crazy"

George

[OG Style]

I'm sorry for the late reply. For some reason I am not getting the email notifications.


What is the build date of your 2007 328i?
09/07
Does it have CA (Comfort Access)?
No
Does it have AT (Automatic Transmission as opposed to MT)?
No
What Scan Tool or Diagnostic Software such as INPA/ISTA do you have?
Autel Maxisys Elite and Protool.
What Freeze Frame Data, Mileage/km, or Fault Details are read for each?
I don't know how to do this.
Has ANY Warning Light appeared on Instrument Cluster?
No

Thanks

[OG Style]

That site is closed down.

Originally Posted by gbalthrop

What is the build date of your 2007 328i?
Does it have CA (Comfort Access)?
Does it have AT (Automatic Transmission as opposed to MT)?
What Scan Tool or Diagnostic Software such as INPA/ISTA do you have?
What Freeze Frame Data, Mileage/km, or Fault Details are read for each?
Has ANY Warning Light appeared on Instrument Cluster?

Depending upon answers to questions above, those codes COULD simply be due to a "hiccup" in the K-CAN Bus, which just occurs intermittently, and clearing and periodic Scan would be recommended. That is particularly true if you have CA Option. If NOT, and if you have AT, then there is concern about the cause & frequency of A0B1 code, as the CAS Module must get a signal from the Transmission that P/N is selected BEFORE CAS will send Voltage to the Starter Solenoid. If BOTH your Gear Indicator Light and Instrument Cluster Gear Selected show P or N when those are selected, then CAS should activate Starter when START button is pressed.

The A731 code relates to the "Bi-Stable" Relay which, when activated, powers ONLY the fuses shown in the diagram below for 2007 328i built AFTER 3/1/2007. That Bi-Stable Relay is IO1139 at the far-right of the diagram linked below, activating F17, 31, 33, 44, 58, 82, 86, NONE of which are necessary to basic operation of the vehicle:
https://www.newtis.info/tisv2/a/en/e...on-box/vVzY4e9

Learning to use TIS wiring diagrams can save a LOT of "Driving me crazy"

George

[andy_06xi]

George writes:

"The A731 code relates to the "Bi-Stable" Relay which, when activated, powers ONLY the fuses shown in the diagram below for 2007 328i built AFTER 3/1/2007. That Bi-Stable Relay is IO1139 at the far-right of the diagram linked below, activating F17, 31, 33, 44, 58, 82, 86, NONE of which are necessary to basic operation of the vehicle:
https://www.newtis.info/tisv2/a/en/e...on-box/vVzY4e9"

I'm getting this code on my 2006 330Xi. No actual problems or dash lights. The code is solid -- i.e. you clear it and it comes right back. Does this actually mean anything? Note that I've also replaced the head unit with an Android unit and replaced the Climate Control module with one from a 135i. Could either one of these changes lead to throwing an A731?

[andy_06xi]

Bump. Any knowledge here? To recap:

1) This is a solid code. Clearing it doesn't actually clear it.

2) I have no actual fault symptoms. I don't know what is powered by the 'bi-stable relay' in my 2006 330Xi -- but whatever it is must be something that I never use.

3) I have a Logic 7 system -- but replaced the head unit with an Eonon 9465B with an RCA to MOST bus adapter. Logic 7 Amp is working fine.

4) Not getting a 'clean' scan is bugging me.

[markw390]

Hi did you get anywhere with this code. I have the same problem 2007 e92 I have eventually found the bistable relay it is inside the fuse box soldered to the main board. I have tested it on my car it the relay was OK. I replaced it anyway it hasn't made any difference. Like you I have scouted the internet to no avail.

[dpaul]

Originally Posted by markw390

Hi did you get anywhere with this code. I have the same problem 2007 e92 I have eventually found the bistable relay it is inside the fuse box soldered to the main board. I have tested it on my car it the relay was OK. I replaced it anyway it hasn't made any difference. Like you I have scouted the internet to no avail.

Terminal 30g-f (New name Terminal 30F; F for Fault) is a voltage supply that switched in the event of a standby current violation (i.e. something is drawing too much power or drawing it when it should not be).

Terminal 30F supplies power to control units and electrical devices that should remain active when a driver is not present BUT which can be switched off in the event of a fault to preserve battery power.

In most BMWs, Terminal 30F is controlled by a "bistable relay". It has two opposing coils; one that opens and one that closes the relay contacts. The relay remains in whatever position it was in after the last activation even when power is removed from the coils (i.e. it is "bistable"). Under normal conditions, 30F circuits are supplied with power. The point of "bistable" is so that stuff that should be switched off stays off until the conditions that led to the switching off are resolved.

There's a lot more to it which you can google yourself if you are interested.

In my E90, 30F provides power to CIC, TCU/MULF, Comfort Access and trailer module. Nothing critical to unlocking the car, starting the engine and driving away. If your CCC and TCU/MULF are working then I'm guessing but A731 is reporting that something in the JBE is no longer able to respond to current-draw violation. There would (should) be other codes if power was being drawn inappropriately.

[andy_06xi]

Well I don't have CIC or Comfort Access or a trailer module. I did have a TCU, but I removed it - so I don't really know whether the terminal is providing power.

I guess it is possible that I shorted something when removing the TCU. If so, how do I get the bistable relay back to its 'normal' state?

[dpaul]

Originally Posted by andy_06xi

Well I don't have CIC or Comfort Access or a trailer module. I did have a TCU, but I removed it - so I don't really know whether the terminal is providing power.

I guess it is possible that I shorted something when removing the TCU. If so, how do I get the bistable relay back to its 'normal' state?

Frankly, in your case I wouldn't bother. The are no functional consequences.

That said, it could be caused by a constitutively low battery voltage (which would likely cause other errors), an IBS sensor problem (also likely to cause other errors) or an internal failure in JBE. Or there is actually an inappropriate current drain on one of the circuits supplied by 30F.

Addressing the last one is easy; determine which fuses supply the 30F circuits, pull them one by one and see if the fault clears. You can look up the circuit diagrams yourself if you have ISTA-D. If not, provide the last 7 characters of your VIN and I'll post it for you.

[gbalthrop]

Originally Posted by andy_06xi

... A731 code... I'm getting this code on my 2006 330Xi. No actual problems or dash lights... Note that I've also replaced the head unit with an Android unit...

Originally Posted by andy_06xi

Bump... I don't know what is powered by the 'bi-stable relay' in my 2006 330Xi -- but whatever it is must be something that I never use... replaced the head unit with an Eonon 9465B with an RCA to MOST bus adapter. Logic 7 Amp is working fine.

Originally Posted by andy_06xi

... I did have a TCU, but I removed it - so I don't really know whether the terminal is providing power. I guess it is possible that I shorted something when removing the TCU. If so, how do I get the bistable relay back to its 'normal' state?

I don't have a "Bi-Stable Relay" (NOT a "Very Stable Genius") BUT my understanding is that it operates after Shutdown (Terminal R [Radio] OFF) to prevent "quiescent current", and the relay is activated (ON Position) again when vehicle is unlocked or Terminal R turned ON again (Remote Key inserted into Insert Compartment). So you would NOT notice any change in operation of the Radio, or any other system, when operating vehicle.

To Answer your question about what fuses are powered by the Bi-Stable Relay on your 2006 330xi, according to ISTA:
1) F17, 5A, which powers the electronics of the Nav System (A112a), Transceiver, Telephone (U400a) and Eject Box (A117a).
2) F31, 20A, which powers the Radio (N9).

Since you altered BOTH the Radio & TCU circuits, there is probably something related to ONE of those that is "confusing" the Bi-Stable Relay Control via the JBE Module.

Attached to NEXT POST are ISTA ScreenPrints of FUB/Functional Description of Bi-Stable Relay operation, and SSP wiring diagram of Relay and F17 & F31 on your 330xi. If you learn anything by tracing the wiring of those two fuses, please let us know.
George

[gbalthrop]

ISTA ScreenPrints related to Bi-Stable Relay on 2006 330xi, as described in prior post.
George

[andy_06xi]

My car did not come with a TCU - I added this later and then removed it later still - so I suppose it is possible that I don't even have a bi-stable relay (as the documentation you provided states its presence is equipment dependent)

It's hard to tell, as my current head unit would not be drawing power through this circuit because I power it directly from the battery. It can't be drawing much in standby though - as I have no drain issues even after a week of non-use.

I think the real issue is either the JBE is confused regarding standby power on some other circuits and triggering the bistable relay (which has no effect in my configuration) or this is an expected error code when no bistable relay is present.

[OG Style]

Do you have a aftermarket head unit in your car?

[dpaul]

Originally Posted by andy_06xi

I think the real issue is either the JBE is confused regarding standby power on some other circuits and triggering the bistable relay (which has no effect in my configuration) or this is an expected error code when no bistable relay is present.

There should NOT be an error code if no bistable relay was installed at the factory. If your car had neither navigation nor telephone prep it will have neither a bistable nor an IBS (according to RealOEM).

So check for the presence of an IBS, which is pretty easy to spot on the battery negative cable.

If you in fact have IBS/bistable, why not try pulling F17 and F40 (or F31, depending on date of manufacture) and see if the error resolves? Again, pretty easy to do. For that matter, I'm guessing the absence of fuses at F17 and F40/31 would mean your car did not come with a bistable.

If that doesn't resolve it, perhaps the JBE is 'confused' (LOL).

[Peewah]

Originally Posted by OG Style

I've got two fault codes on my car that I can't figure out. Does anyone know anything about them?

A731 Supply, terminal 30g_f
A0B1 Input, Selector-lever

Thank you

Does your car have an IBS connected to the negative side of the battery? If not then it can potentially throw the A731 code as well.

[OG Style]

Originally Posted by Peewah

Does your car have an IBS connected to the negative side of the battery? If not then it can potentially throw the A731 code as well.

Yes.

[that1crzywhtguy]

Did this ever get solved? I also have an A731 I can't figure out....

[OG Style]

Unfortunately I never did figure it out and the car was rear ended and totaled.