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Hi, I have a problem with MMI 3G, there is no component, radio, CD, navigation, phone, etc. Following VCDS ROJ 18.9.0 tests, optical bus diagnostics, both the tested modules are OK and the bus is OK. The technician said the display may be faulty. I bought a display with the same code as the old Audi Q5 2009 2.0 display and I mounted it but did not give any sign of life. What do you recommend me to do?
How old is your battery? Make sure it is fully charged. The first thing that the Audi Power Management System turns off with a weak battery is the MMI.
Yes there are also there things that can go wrong.
Good luck!
Last edited by Bob Petruska; 02-25-2019 at 03:21 PM.
Thanks for the reply. My battery was bought one month before the incident. It's not original but I do not have any problems with cold start. I do not know what other problems might be, the fuses are checked, the display replaced, I replaced the radio module and the module behind the glovebox,with MOST fiber optic optical loop bypass Female adapter, but for nothing
Thanks for the reply. My battery was bought one month before the incident. It's not original but I do not have any problems with cold start. I do not know what other problems might be, the fuses are checked, the display replaced, I replaced the radio module and the module behind the glovebox,with MOST fiber optic optical loop bypass Female adapter, but for nothing
When you replaced the battery did you recode the Q5 Power Management System to let it know that a new battery was installed. If not, the Q5 Power Management System retains the old battery settings. The PMS counts the total battery energy used over time, if you didn't reset this counter the PMS will continue to count total battery energy usage (old battery data+ new battery data) and will get to a threshold to trigger certain system shutdowns. the MMI is usually the first.
Do you have a VCDS?
I'm not saying that this is your problem but worth looking into...…….
Bob-
Regardless of battery, shouldn't the power management system be powering up everything when the alternator is running and there's 14.4 volts available? After all, the battery is an SLI battery, it is only designed to start the car. The alternator is intended for running things.
3G-anything may be a moot point, as the major carriers have discussed shutting that down late this year or next year, in favor of LTE and "5g-ish".
"there is no component, radio, CD, navigation, phone, etc." Sounds like a fuse is blown, or a power lead disconnected. Have you checked whatever fuse(s) your manual says are for the MMI system?
Bob-
Regardless of battery, shouldn't the power management system be powering up everything when the alternator is running and there's 14.4 volts available? After all, the battery is an SLI battery, it is only designed to start the car. The alternator is intended for running things.
3G-anything may be a moot point, as the major carriers have discussed shutting that down late this year or next year, in favor of LTE and "5g-ish".
"there is no component, radio, CD, navigation, phone, etc." Sounds like a fuse is blown, or a power lead disconnected. Have you checked whatever fuse(s) your manual says are for the MMI system?
The Power Management System checks all systems and data before the engine is started. If the Energy Transfer Balance data (VCDS measuring Block 022) indicates that the battery doesn't have enough energy to start the engine is will shut down sub systems (MMI, power seats, rear defroster, heated seats, etc.) to try and allow the engine to be started. The Energy Transfer Balance never gets better, only degrades. Once a sub-system is shut down due the bad Energy Balance Transfer number it stays shutdown until a new battery is installed.This is why it is important to reset the PMS when you change to a new battery or all the old battery data stays intact.
The SOC means very little in this case as we all know that you can charge a battery to 100% that has a very low remaining capacity left in it due to aging.
I'm not saying that this is the OP's problem, but if I installed a new battery I would sure want the PMS reset. There is a lot of data stored in the PMS that is complex, there are histories of all the power constraints when accelerating and idling.
Over the years on AW we had a few posts on black MMI screens/no radio and the problems disappeared when a new battery was installed.
Bob-
I have a mental picture of Schultz (Hogan's Heros) saying "Verrrry Interesting."
"Once a sub-system is shut down due the bad Energy Balance Transfer number it stays shutdown until a new battery is installed."
With that kind of logic, I wonder if they would also build elevators that returned to the ground floor--and then stayed there, never to rise again.
I guess that accounts for the split stories that you "must" or "don't need to" reprogram the BMS when installing a new battery. Presumably resetting clears bad EBT, but if you're replacing a battery before the EBT has gone psychotic...you could skip the reprogramming. So both answers (must/needn't) become "correct".
Think there's a drug problem in Ingolstadt?
No Redd it's schnapps not drugs.
Ah for the good old days of robust alternators with replaceable regulators and batteries we'd top up a couple of times a year.
As maddening as it is, I'd say the modern German charging/storage systems are more long-lived than in the past.You just have to treat them like women.Tread carefully !
Hello, It is not really the fault of the battery, I replaced the new battery with the original battery, which I have recharged over 24 hours, having over 13 V, cold, but nothing has changed at MMI, the fuses are checked by the specialist, all are good, the replaced display does not remove the system from numbness, so the whole screen, which still advised me
02-23-2019, 03:32 AM
Audi Q5 2009 MMI 3G is dad
