[Owen81]

Hey all, I recently bought a 2009 335D and the CEL came on the other night...
Ran the codes with Carly and got:

Motor Control:
Engine / Motor
Fault: Receive news of IBS LIN-bus communication
Code: 49A5
Fault: Message signal is not valid in message
Code: 4A74
Fault: message fault
Code: 4A79

Reset the codes twice but they return almost immediately.

Did some looking around and found various threads linking the coolant temp sensor and/or the glow plug module to some of the codes. However the IBS LIN-bus code makes me think its something related to the battery.

I found a PDF HERE describing the LIN-Bus and a good explanation of the IBS.

It states:
On the new BMW 3 Series the LIN-Bus is used for the following connections:
• Connection from the FRM to the driver's side switch cluster (19.2 Kbit/s)
• Connection from the RFZ to the RLS (19.2 Kbit/s)
• Driving actuators IHKA (9.6 Kbit/s).

When I first got the car it had a code relating to the heated mirror DTC which I believe is linked to the FRM.


Anyone have any experience with these codes?
Is there a more in depth diagnosis I can run? INPA?

Thanks

[Owen81]

Well I tried using INPA but I believe I have the wrong cable (white circuit board) as I could get ignition and battery awareness but could not communicate with the specific modules.

Is there a site or program where I can look up more information on these codes?

[Yozh]

Before you do digging into different modules, etc. Please check the health of your battery. If your vehicle is a 2009 and has an original battery, you may be up for a replacement. All kinds of weird and unexplainable codes could be a result of an old or weak battery. There are a few threads on here about battery replacement and coding.

[Owen81]

Just an FYI.

After replacing the battery to no avail, I replaced the glow plug control module as it seems to be a common point of failure.

This cleared the codes and they have not returned as of yet.

OBD codes from Torque in case someone is searching the codes:

P064C: null
U0106: null

[Wolddd]

Originally Posted by Owen81

Hey all, I recently bought a 2009 335D and the CEL came on the other night...
Ran the codes with Carly and got:

Motor Control:
Engine / Motor
Fault: Receive news of IBS LIN-bus communication
Code: 49A5
Fault: Message signal is not valid in message
Code: 4A74
Fault: message fault
Code: 4A79

Reset the codes twice but they return almost immediately.

Did some looking around and found various threads linking the coolant temp sensor and/or the glow plug module to some of the codes. However the IBS LIN-bus code makes me think its something related to the battery.

I found a PDF HERE describing the LIN-Bus and a good explanation of the IBS.

It states:
On the new BMW 3 Series the LIN-Bus is used for the following connections:
• Connection from the FRM to the driver's side switch cluster (19.2 Kbit/s)
• Connection from the RFZ to the RLS (19.2 Kbit/s)
• Driving actuators IHKA (9.6 Kbit/s).

When I first got the car it had a code relating to the heated mirror DTC which I believe is linked to the FRM.


Anyone have any experience with these codes?
Is there a more in depth diagnosis I can run? INPA?

Thanks

Sorry to bring and old thread up, I have the same problems and faults won't clear after replacing glow plugs and module, did you ever find the solution to this? Part of me is thinking the intelligent battery sensor has gone?

[Owen81]

Originally Posted by Wolddd

Sorry to bring and old thread up, I have the same problems and faults won't clear after replacing glow plugs and module, did you ever find the solution to this? Part of me is thinking the intelligent battery sensor has gone?

Replacing the battery didn't clear the faults for me, replacing the glow plug control module did however.

Have you ever replaced your battery? Could be worth a try especially if you're still on the original battery which would be 6-9 years old now.

[Wolddd]

Originally Posted by Owen81

Replacing the battery didn't clear the faults for me, replacing the glow plug control module did however.

Have you ever replaced your battery? Could be worth a try especially if you're still on the original battery which would be 6-9 years old now.

Only just noticed the reply sorry, no I haven't replaced the battery but I will suggest it to the garage, thanks mate

[Owen81]

Originally Posted by Wolddd

Only just noticed the reply sorry, no I haven't replaced the battery but I will suggest it to the garage, thanks mate

Please post an update on what resolved the issue

[Wolddd]

Originally Posted by Owen81

Please post an update on what resolved the issue

Specialist fitted two new injectors on Friday, problem still not resolved, I have no idea where to go with this now? When it first went in I suggested maybe something was wrong with the ibs cable for the battery but they said that was fine too

[Owen81]

Injectors? Not sure why they would replace those. Did you replace the battery? Like @Yozh has said, a lot of weird problems can surface from a bad battery, even if the battery tests "fine".

There are diagnostics you can run with the BMW software to test your glow plug system. I would start there. The IBS monitors voltage as well as current coming from the battery, this code would trigger if you had say, a short in your glow plug system. Just a thought.

[JT8Diesel]

I have started to get the same code. I replaced (and coded with Carly) my battery last summer. I've never had problems starting, even after the car sitting for a week at -20ºC / -4ºF

Any testing that can be done without INPA / etc. to check glow plugs, glow plug control module, or IBS?

[Owen81]

I would bet its the module, but I'm not sure how you could test that. Maybe monitor voltages at the battery when the glow plugs are triggered?

[JT8Diesel]

I think you're right. It's not affecting start or driveability. I'll probably hold off on doing anything for now. I don't need an emissions test until 2019 so I can live with the SES for now.

I'm planning on a walnut blast in the mid-term, once the manifold's off it will be a good time to change the module then.

[Owen81]

Yup, might as well do it then.
Its a very common failure so a little pro-active replacement isn't a bad thing.

While the manifold is off you could also test the glow plugs by measuring the resistance I believe.

I would also monitor your coolant temps, this can be done through the secret OSD menu or with a BT/USB ODB adapter and Torque/Carly.
Low coolant temps due to a failed thermostat can cause the glow plugs to be activated more often, and for longer than they are supposed to. This causes the module/plugs to fail prematurely.

[JT8Diesel]

I replaced the thermostat last fall, I get to 88° no problem now. My typical drive is 1.5 hours at 120 kph on the highway.