[Madsen203]

Originally Posted by mattsrs

Off topic, how do you like those DWS06+-s vs original runflats? How much better is the comfort and road noise?

I’m in the camp that the road noise is similar to RFT but I only had the RFT for 2 weeks.
The turn in is not as sharp. Bumps are muted. Traction isn’t as great on dry surface.

I think these are good trade offs for having an A/S tire, tires that are 50% less cost with likely 50% longer life, smoother over bumps, and useful in wet and light snow conditions.

I feel like on cement(or whatever it is), they ride louder than the summer RFT and override wind/engine noise. On asphalt or similar, they are quiet and I’ll hear engine and wind noise before tire noise.

Back to OP: I’d buy after market if the deal refuses to warranty this.

[admranger]

Originally Posted by thenew3

I did ask the service advisor when he brought up that the battery wasn't properly maintained.

He didn't really have an answer for me. (he ummed and ahhhed for a bit then went silent)

He did text back late yesterday saying they saw in the computer that there was a period where the car wasn't driven for 22 days.

I told him yes, it's our road trip vehicle and often it sits for a few weeks in my garage but when it does sit, I have it hooked up to a BMW battery maintainer that I bought from their dealership parts dept specifically for this car.

I bet there was more umming and ahhhhhing by the Service Manager when you brought that up.

[thenew3]

Just got a text saying the car is ready. Going to go pick it up in an hour. He said they were able to update the idrive software without replacing the battery.

Funny how when I ask for it to be covered under warranty, the part is no longer an issue and doesn't need to be replaced.

They also said they change the oil, but the app still shows oil service due.
They said they did an alignment too. We'll see if they actually did anything.

[thenew3]

Got the car back. Here's their latest round of excuses.

They said the BMS indicated the battery capacity at 80% or greater. A load test shows the battery at 11.2v. They said BMW's policy for battery replacement is if the load test is under 10.8v or the BMS indicate battery capacity is under 50%. So they refused to replace it under warranty.

When asked about all the issues due to low voltage including inability to install the OTA, they said they manually updated (with a 12V booster hooked up) to latest 03/2024.53 (confirmed). And that they couldn't replicate the other issues. ( I was able to reproduce one of them while picking it up in their parking lot)

They said they kept the car for 3 days to test what the battery level looks like after sitting over night and that they found it to vary between 11.8 and 12.1v which BMW considers acceptable.

They forgot to do the alignment, and they claim they did the oil change, however the on board indicator still shows oil change needed.

i'm leaving for a week long work trip so taking the car home for now, and will return it next month to get the oil change indicator reset (or oil actually changed, can't tell if they really changed it this time, although they claim they did and the paperwork show the parts for oil change). Will also get wheel alignment done.

They claim the estimate for new tires was a typo and that instead of $5k, it's actually $2700 (which is still quite a bit higher than other places).

[GL]

Is coding required when replacing the AGM battery?

[Orient330iNYC]

Originally Posted by GL

Is coding required when replacing the AGM battery?

basically yes, the BMS needs to be told that a new battery has been installed so it resets the charging curve. IIRC as the battery ages, the charging system increases the charging voltage. if you replace the battery without resetting this, the new battery keeps getting charged at the higher voltage, reducing its life.

[Orient330iNYC]

Originally Posted by thenew3

Yes, first thing I tried was to hook it up to a charger (BMW/CTEK charger) for a few days. It showed the battery was full after about 24 hours. The BMS system in the X7 still thinks battery doesn't have sufficient charge to install the OTA.

Using CarScanner app, it shows the 12v at 11.7v when engine is off and 13.4v when engine is running.

are you charging with the hood open or closed?

[thenew3]

Originally Posted by Orient330iNYC

are you charging with the hood open or closed?

Have tried both ways using the jump terminals under the hood as the charge point. Doesn't seem to make much of a difference. Takes the charger anywhere from 12 hours to 48 hours to indicate it's full, depending on the initial state of charge (how long it's been sitting parked).

[thenew3]

Originally Posted by Orient330iNYC

Pulled that up from ista with the vin of a 2020.
Surprised as well at the instructions as all my past bmws the primary battery is in the trunk

Got my car back and took a look, under the driver side under that plastic cover in your picture is the brake fluid reservoir and some kind of electronic unit (ecu?).

Passenger side is a small lithium 12v battery.

[Qsilver7]

Originally Posted by GL

Is coding required when replacing the AGM battery?

There’s coding….and there’s registration. These TWO different things oft get conflated as if they were the same…they are not the same thing.

REGISTRATION is required anytime you change the battery. Registration sets a new baseline for the IBS (intelligent battery sensor) as it communicates with the car’s power management system.

CODING is required if you replace the battery with a different type or one with different specs.