Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

Reply
 
Thread Tools Display Modes
  #1  
Old 12-20-2010, 04:26 AM
jnsogburn jnsogburn is offline
Registered User
Location: GA
 
Join Date: Dec 2010
Posts: 1
Mein Auto: 1986 Z4 Roadster
Exclamation Z4 false flat tire indicator light

Has anyone experienced and found fix to correcting false dashboard indicator lights for the flat tire?
Reply With Quote
Ads by Google
  #2  
Old 12-20-2010, 06:12 AM
Randy Forbes's Avatar
Randy Forbes Randy Forbes is offline
Investigative Tinkerer
Location: SW Florida
 
Join Date: Apr 2002
Posts: 4,949
Mein Auto: ///Motorized Vehicles
Usually not a big deal, just requiring resetting the system. This assumes that you've already checked the air pressure, with a gauge, for each tire.

In the fall/winter when ambient temperatures drop, it's not uncommon for your a tire's pressure to go lower (moisture in the air inside a tire expands and contracts with the temperature swings).

Not sure if the Z4 system relies on the wheel speed sensors or transmitters inside the tire to monitor the pressure (I have cars that do it both ways) but if it continues to give you trouble, when you know the pressures to be correct, you should have the system checked out by someone in the know.

Welcome to the 'fest. I have to admit, you have one of the oldest (1986 ) Z4s that I've ever heard of!
__________________

Randy Forbes
1957 Austin-Healey 100/6 Wine Red
1961 McCulloch R1 go-kart Screaming Yellow
1995///M3 Coupe Dakar Yellow Eurosport Twinscrew S/C
1999///M Rdstr Cosmos Black Eurosport Twinscrew S/C
1999///M Coupe Estoril Blue Eurosport Twinscrew S/C
2001///M Rdstr Steel Gray
2011 X5 35i Sport Deep Sea Blue/Cinnamon

Last edited by Randy Forbes; 12-20-2010 at 06:13 AM.
Reply With Quote
  #3  
Old 12-20-2010, 08:31 AM
Psygnosis Psygnosis is offline
Officially Welcomed to the 'Fest
Location: WA
 
Join Date: Oct 2008
Posts: 253
Mein Auto: 2004 Z4 3.0i Sport
Early Z4's relied on the traction control system to monitor the tire pressure. 2006ish? they switched to sensors in the wheel. But if you've checked the tires and there fine, the next time you drive off, press the button to reset the flat tire indicator.
Reply With Quote
  #4  
Old 12-20-2010, 04:40 PM
shipkiller's Avatar
shipkiller shipkiller is offline
Underway on Nuclear Power
Location: Virginia Beach, VA
 
Join Date: Nov 2007
Posts: 886
Mein Auto: Me
See paragraph 2.1.5 below:


Tire defect indicator (RPA), DSC MK60


The tire defect indicator RPA is designed to monitor the tire status while driving. For this purpose, the ABS speed sensors determine the speed of the four wheels independent of each other. A calculation logic stage implemented in the DSC control module evaluates the received data and makes the corresponding information available to the driver as required thus informing the driver of a possible tire defect.

1. System structure

The tire defect indicator consists of the following components:
  • 4 ABS speed sensors (already fitted)
  • 1 DSC control module (already fitted)
  • 1 Wiring harness
  • 1 calibration button (RPA button)
  • 1 DME control module (already fitted)
  • 1 Lateral-acceleration sensor (already fitted)
  • 1 Yaw rate sensor (already fitted)
  • 1 Signal lamp
2. Functions

The main function of the system is to monitor the tire pressure while driving. The tire pressure to be monitored is determined by the driver. With the aid of the reset button the driver instructs the system to adopt the current set of wheels with the selected tire pressure as the set reference.
If the speed of a wheel changes as the result of losing air pressure, the control module sends a corresponding signal dependent on the pressure deviation to the driver information system (warning lamp and gong).

2.1 System statuses

The RPA system differentiates between 5 operating statuses:

2.1.1 ”Active” status

After ”switching on” the ignition and after a self-test, the RPA assumes the ”active” status. If the tire pressure corresponds to the pressure set by the driver minus a permissible tolerance, no message is issued to the driver.

2.1.2 ”Warning” status

The signal lamp lights up red and an acoustic signal sounds. The state ”Warning” (pressure drop of approx 30%) indicates that road safety is no longer assured. In the state ”Warning”, it is not possible to run the learning procedure. Pressing the RPA button for 4 seconds resets the RPA to the ”Active” state.

2.1.3 ”Inactive” status

The warning lamp lights yellow. In the ”Inactive” state, all RPA functions are shut down.

2.1.4 ”Fault” status

The warning lamp lights yellow. The ”Fault” state is created by a sensor fault detected by the DSC control module or RPA button actuation of more than 120 seconds. With ”Ignition On” as well as on starting diagnosis, the RPA becomes active again and then again reports a fault in the case of a sensor fault or a time-out of the RPA button signal.

2.1.5. ”Learning” (Standardization) status

The learning status is initiated by pressing the RPA button for 4 seconds. The warning lamp lights up for 12 seconds to confirm the start. The learning procedure must be run every time the tire inflation pressure is corrected or after a tire change. The driver is responsible for ensuring the tire inflation pressure is set correctly. The system cannot carry out a plausibility check. The system is able to detect a reduction in tire pressure of approx 50% of the cold air pressure after a minimum of 10 minutes. As the learning procedure progresses, the pressure difference detected as a tire failure reduces to approx. 30%.


2.1.6 New status

The warning lamp flashes yellow. In the case of new DSC control modules, all RPA functions are disabled. The RPA system is activated by initiating the learning procedure.

3. Diagnosis

The sensors used by the RPA system are already monitored by the ABS and DSC. The RPA will also signal a fault if the ABS and DSC detect a fault.
The following event triggers an additional entry in the fault memory:
  • Pressing the RPA button for longer than 120 seconds.
__________________
.
.
How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
Reply With Quote
  #5  
Old 12-20-2010, 05:50 PM
chickdr chickdr is offline
Officially Welcomed to the 'Fest
Location: Atlanta, GA
 
Join Date: Mar 2009
Posts: 1,024
Mein Auto: '06 M Roadster Imola/Blk
Quote:
Originally Posted by jnsogburn View Post
Has anyone experienced and found fix to correcting false dashboard indicator lights for the flat tire?
I assume you have a 2006 Z4? Your sig says 1986.... Just press the reset light in the center console to reset.
Reply With Quote
  #6  
Old 12-20-2010, 06:42 PM
Pants Pants is offline
Road Rager
Location: Texas
 
Join Date: Oct 2010
Posts: 117
Mein Auto: '06 Z4 SI
As per previous post.

After you inflate your tires you must depress the corresponding button.
It has a matching symbol, hold it down for a few seconds and the light on the dash will go out.
Reply With Quote
  #7  
Old 01-11-2011, 08:38 PM
wideman wideman is offline
Registered User
Location: Olympia, WA
 
Join Date: Jan 2009
Posts: 6
Mein Auto: BMW Z4 3.0i
How to reset my cars systems

I have a 05 Z4 3.0i and was driving home in the snow. The conditions were fine when I left from home. But on the way home as the rear wheels would start to slip the traction control would kick in as expected. However just before I got home it really started to slip and the dsc light, brake, abs and tire pressures lights all came on and stayed yellow. Even when the car was home and turned off, I turned it back on and the lights all came on yellow again. Can someone help me on how to reset this.

Thanks,
Werner
Reply With Quote
  #8  
Old 01-12-2011, 04:30 PM
k.merkel k.merkel is offline
Now M52TU Powered!
Location: Palatine, IL
 
Join Date: Jan 2010
Posts: 111
Mein Auto: 1999 Z3 Coupe
Quote:
Originally Posted by wideman View Post
I have a 05 Z4 3.0i and was driving home in the snow. The conditions were fine when I left from home. But on the way home as the rear wheels would start to slip the traction control would kick in as expected. However just before I got home it really started to slip and the dsc light, brake, abs and tire pressures lights all came on and stayed yellow. Even when the car was home and turned off, I turned it back on and the lights all came on yellow again. Can someone help me on how to reset this.

Thanks,
Werner
Have you tried driving the car on a clear road? I suspect the DSC saw so much slip it presumed a fault occurred. As long as a component has not actually failed, the lights may go out when the DSC sees everything operating normally.
__________________
1999 Z3 Coupe, Arctic Silver/Tannin Red & Maple
Reply With Quote
  #9  
Old 01-12-2011, 04:38 PM
shipkiller's Avatar
shipkiller shipkiller is offline
Underway on Nuclear Power
Location: Virginia Beach, VA
 
Join Date: Nov 2007
Posts: 886
Mein Auto: Me
Another possible scenario is that you got a lot of snow or ice between the DSC sensor and the timing ring. This would attenuate or keep the sensor from reading the wheel speed.

This same issue happened on my sons car. Once the snow/ice melted away the DSC errors on his car when away.

Just a possibility...
__________________
.
.
How does something immoral, when done privately, become moral when it is done collectively?
Furthermore, does legality establish morality?
Slavery was legal; apartheid was legal; Stalinist, Nazi, and Maoist purges were legal. Clearly, the fact of legality does not justify these crimes. Legality, alone, cannot be the talisman of morel people. - Walter E. Williams
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 03:16 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms