Renntech Lowering module problem

[Jtizzle]

I just installed a renntech v3 lowering module on my 2011 e550 and im getting a malfuction on my display. Ive double checked all the wiring and fuses and still cant get it to work. I cant raise or lower my car and the sport and comfort mode doesnt work either. Does anybody have a solution to this?

To remove this ad, register today or login if you already are registered!

[220S]

fwiw, this isn't an "airmatic malfunction." It's a Renntech module install malfunction. Might want to reword your thread title. Now Google will pick up another "airmatic statistic."

Call the vendor you bought it from or Renntech themselves. They are on these boards now (new sponsors not too long ago.) Also search is your friend....

[RENNtech AMG]

Jtizzle,
I hope that this problem has been resolved after the phone call today regarding the wiring on the module. If not, feel free to contact us again directly.
Thanks,
RENNtech

[Jtizzle]

The guys at renntech are great. It was my wiring that was the problem.
Dustin at renntech cleared it all up for me.

Thanks guys

[shaytun]

Have you had any problems since. I want to get this on my w212 E550 4MATIC. How much did you lower your car and at what speed do you have it returning to stock height?

[Jtizzle]

I haven't had any problems mind you it's been two days since I installed it but it works great so far. I'm still trying to figure out how low I can go without doing any serious damage to the suspension. So far I've dropped it to 45mm all around and it rides nice but I'm sure I'll have tire wear. As for the speed I set the car to return to stock, I set it at 100 km, only because I don't want the car going up and down all day in city driving. I don't want to burn out the air pump. i'm not sure how reliable the pump is and i don't want to be in the shop every week.

[pohjeekiller]

Hows the ELM been so far? Thinking of purchasing the same ELM and would love to see some pics of your ride in it's different ride heights...TIA

[shaytun]

I put my order in yesterday and should get it installed in the next week. Will order wheels soon after. Will def post some pics.

[Jtizzle]

It works really well. The only issue that I have is that after I hit my preset speed for the car to go to factory ride settings, the car will not go back to my preset lowered settings until I open my driver door, if that all makes sense. As for pics I have a couple but I have 20"wheels ordered for the car and when I have them on I'll snap some shots. 2 weeks.

[oggie]

How much is this module?

[shaytun]

About $1,300

[CLSED550]

Once you double check that your using correct wires, the first thing to check is power and ground. Make sure the wires that "t" into factory harness are Making a connection (test with a test light) a bad power or ground will cause unit to not respond and not light up, giving the dash a malfunction error on display.

[RobbieRob]

I know this is an old post,but does your sport/comfort and raise functions work with the module installed and car lowered? Also, can you use any type of tablet and keep in your car to adjust on the fly?

[shaytun]

The sport and comfort modes work as before which is great. Both will be lower by how much you initially set.
You have to use Renntech's tablet. Others don't work.

[RobbieRob]

Does the raise button still work? in other words can I slam it and then hit raise to drive? and are you happy with it. I'm thinking about getting, so sorry about all the questions, and thanks for the response.

[shaytun]

Robbie,
No worries about the questions. That's what everyone is here for, right? So you can basically drop the car how you like. Renntech doesn't recommend more than about 1.25" for street use. That's about what I have in the front and about 1" in the back. I drive in sport mode with those settings, it looks great, with the back slightly tucked.
Now the raise button works, but I'm not sure that was made to drive in. But I have no expertise in that. The comfort setting is about 0.5" higher than the sport. I usually drive in sport and in bad weather or crappy roads put it in comfort.
Things to consider:
1. I think you're fine with your spacers and shouldn't rub, but the lower you go the more chance it may. You can play with this and see what works. I assume you have stock wheels?
2. The airmatic doesn't have a huge travel distance and can bottom out more than you might expect, so be careful about "slamming" too much, especially in the Northeast. Again, I often go to comfort setting on freeways I'm not familiar with because the car is already significantly lower and it normally lowers more at freeway speeds. I've bent one wheel already and don't want to go through that again. Less issue with stock wheels. Start conservative and see how you like it.
3. You can set the car to return to normal settings at any speed. For example, the car can be dropped below 30mph and rise to stock above that. I found this to not work well, as often the car wouldn't drop back down under 30. I turned this feature off, and the car is lower all the time. I think it looks better anyways and there's less "up and down" from the airmatic.
4. I had my shop create a USB connection under the dash, so I can easily connect my laptop and change the settings. This was much cheaper than the Renntech tablet. Truthfully, I rarely change the settings now that I found what I like.

[RobbieRob]

Awesome, You explained it all. I just ordered 20 inch wheels, so I will mount them and see if I should lower at all, or just lower a little. From what I read the v3 can lower each corner in 1mm increments so I can get it just right. The usb idea is very smart, but it sounds like once you set it to where you like, its good to go. Thanks again for all the answers.

[RobbieRob]

Installed the v3 today, pretty easy to install. I am having problems though, I can't seem to get the car exactly where I set it on my laptop sttings, and the right side of the car will continously sit lower then the left even if I put the mode into Renntechs factory settings... Driving me nuts. Any ideas?? I figured with this module I could run each rears at different heights to compensate for the 1/4" difference side to side. I read somewhere on this forum that on our cars they sit a little lower on the passenger side, but I want it level.

[shaytun]

Robbie,
My car also sits lower on the passenger side MOST of the time. So I went crazy when I first installed this. On my stock rims, I didn't really notice it. I checked with stock rims and module off and there's still a difference. On my 20's with thin tires it really stood out. I called Renntech and they said it wasn't the module. I took it to Mercedes and they said nothing was wrong with the air suspension (no leaks, etc). Basically, the car is almost never even. The way to check is drive straight ahead for a while and then stop the car and look....should be even. Depending on which way you turn in to park or how fast before you turn the car off, one side may be lower than the other. There are times the driver side is lower for me. Actually, it really doesn't matter how the car sits (other than cosmetically) as long as it's not slammed on one side and not the other. It's even usually when you drive. If anyone knows more, please chime in.
Don't try to compensate for this with the module settings. There's no way you can measure the difference with precision. Plus the suspension is constantly changing as you drive. I think this is all normal but a bit annoying to a perfectionist.

[RobbieRob]

SHAYTUN, this is extremely annoying to me, like you said now with the new wheels it is very noticable. That is just ridiculous that MB can't get their air ride to sit level side to side, and more ridiculous that with a renntech lowering module, which your supoosed to be able to adjust each corner individually, it is still uneven. I can measure the wheel gaps, and should be able to very easily, compensate the difference in the heights, but the module won't due it. I should have saved the 1400 and put links on if I knew the car was going to still sit uneven. Maybe MB is smart for not using air matic on the new 2012's, makes me wish I had coils.

[Arrie]

Originally Posted by RobbieRob

SHAYTON, this is extremely annoying to me, like you said now with the new wheels it is very noticable. That is just ridiculous that MB can't get their air ride to sit level side to side, and more ridiculous that with a renntech lowering module, which your supoosed to be able to adjust each corner individually, it is still uneven. I can measure the wheel gaps, and should be able to very easily, compensate the difference in the heights, but the module won't due it. I should have saved the 1400 and put links on if I knew the car was going to still sit uneven. Maybe MB is smart for not using air matic on the new 2012's, makes me wish I had coils.

My 2010 E550 also sat uneven at rear until both rear air springs were replaced. Now it is dead even.

[RobbieRob]

Thanks, The more I google it and search, it seems to be a problem. Most people just don't notice. I guess I will put my car back to stock settings and check with ny dealer.

[FromM3toAMG]

As of about 3hrs ago.. this is my problem also.. i took the RennTech module out.. and now i still have the "Malfunction" message.. and cant raise or lower my car and the sport and comfort mode doesnt work...

considering this is the condition of the box it came in..who knows... keep in mind this box was inside of another box...

[hyperion667]

^^yeah, it's the boxes fault???

LOL

[FromM3toAMG]

Originally Posted by hyperion667

^^yeah, it's the boxes fault???

LOL

Ok idiot, I'm was implying that something may be wrong with the module, last I checked very few electronics perform well after being smashed..... Call me crazy.