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Hi four.8is. Exact same color and interior as mine. Beautiful trucks, just wish they were more reliable.

TerminatorX5 has given you the most common failure mode for the water in the rear (sunroof). As he stated there are a lot of electronics back there so try clearing those drains ASAP. In your case the module for the SLS is behind the glove box as 4.8is used EHC2 and have the front leveling as well.

The large black dome over the battery contains the SLS pump and valves. If you take the two bolts and two nuts off and flip it on it's side you will see these parts.

Hopefully the new battery clears the problem (BMW electronics well known for being flaky without really robust voltage levels). If not your best bet to is to find someone with a really good scan tool.

Quote:

Originally Posted by Roadkill (Post 921342)

Socket, that's exactly what happened to me. That's why I threw that question in there. The TPMS system is monitored by the EHC2 module (Electronic Height Control 2 Axle) and when the module faults, it can through the TPMS light. Mine would happen only after 45 minutes or so of sustained highway driving. After 3 months of pulling my hair out, killcrap (member on this site) said to look at the EHC2 module. Sure enough, he was right. It's pricey, $640, but it fixed the problem. Thank god for aftermarket warranties.

This very exact same thing just happened to me a week ago and I'm dealing with it now. It involves the same TPMS condition after 45 minutes of driving with the combination SUSP INACTIVE message.

I have a 2006 4.8IS, does that mean I have the EHC2? I'm looking at the diagram but it looks like I have the EHC1 because I have the pumpkin shaped Encapsulated Air Supply System. I am confused. What do I have?

According to Roadkill (which describes my exact situation with the TPMS and SUSP INACTIVE message) I should have the EHC2 based on his description above?
I've already pulled down the glove box if that's indeed where it is located and I ran into a plastic molded panel cover behind the glove box, is it behind this panel?

Also, for those who have replaced this module already, where did you get yours and is there a better alternative than the dealer?

BTW, already checked associated fuses front and back, they're all intact.

Thanks in advance everyone,
MANGO

2006, 4.8iS = air at all 4 corners = EHCII = EHC2

can't tell you where to get the module, though... :(

Thanks Terminator!
Appreciate the helpful info.

MANGO

My advise to anyone replacing this module is get it from the dealer. The part has a two year warranty when purchased from the a dealer... why do I say this? Because our replacement module also failed. Since it was bought and installed by the dealer, it was replaced and recoded at no charge.

Super info in here - spent ages chasing this issue and now knowing the TMPS is linked through the EHCII module I can be pretty sure I need a module !

Did all you guys get from the dealer or did you get cheaper online ?

Ive taken my modul apart and no signs of an damage etc but appears to be made by Wabco and has some part numbers on it ?

There was a guy in the UK ? That was repairing them a few years back when our module failed. I don't know if he's still around.
The modules are finicky & fragile and need to be coded and calibrated.
My advice is to take the hit and get it from the dealer. That way you get a 2 year unlimited mileage warranty on it.
We went through two modules in a year but since it was bought and installed at the dealership. The second one didn't cost a dime to have installed

Thats cool chap - a few people on the UK forum have some indepth knowledge of the systems but not as many as on here :(