My 1999 540i has started having a Trans. Failsafe Prog warning that flashes periodically at startup and shutdown. I've also noticed that none of the electrical switches on the steering column (stero vol +/1, cruise control, horn) are not functional. Thanks for any diagnostic help.
Country: United StatesMake: BMWModel: 540iYear: 1999
I've followed the owners manual instructions for the Trans. Failsafe Prog code (stop, park, parking brake, turn off, wait, start again). Seems to drive normal. Prior to the warning I noticed fluctuation in the fan speed when the vent was on.
PLEASE NOTE THAT EXPERTS ARE ONLY COMPENSATED WHEN THE ACCEPT BUTTON IS PRESSED . JUSTANSWER IS AN HONOR SYSTEM AND EXPERTS ARE ONLY COMPENSATED WHEN THE ACCEPT BUTTON IS PRESSED . EVEN IF YOU ARE ON A SUBSCRIPTION WITH UNLIMITED OR MULTIPLE QUESTIONS ACCEPT STILL NEEDS TO BE CLICKED TO CREDIT YOUR EXPERT THANK YOU
JUSTANSWER IS AN HONOR SYSTEM AND EXPERTS ARE ONLY COMPENSATED WHEN THE ACCEPT BUTTON IS PRESSED
EVEN IF YOU ARE ON A SUBSCRIPTION WITH UNLIMITED OR MULTIPLE QUESTIONS ACCEPT STILL NEEDS TO BE CLICKED TO CREDIT YOUR EXPERT
Before reading my answer below, please note that I do not receive any credit or compensation whatsoever for my time and effort until the green ACCEPT button is pressed. Thank you.
Hello and welcome to JustAnswer BMW,My name is XXXXX XXXXX it will be my pleasure to assist you today.
Transmission failsafe occurs when the transmission senses a fault or is missing a needed input that is required for proper operation. Transmission failsafe can occur for many, many reasons. Anything from a simple low fluid level or failed sensor to complete transmission failure can cause failsafe. Even a missing input from the ABS system or a failing alternator can cause failsafe, etc, etc, etc.
The good news is that when failsafe occurs, the transmission computer logs a record of the fault, which can be read out to shed additional light on the exact nature of the issue. Thus, the only way to determine why the transmission is in failsafe is to have the fault memory read out using a BMW compatible scan tool. Once the fault memory is read, the problem can be identified, and the issue fixed.
Without knowing what faults are stored, all a person can do is guess at the problem - which can get very expensive, very quickly.
You can always try to unhook the battery for an hour to see if the warning will go away, but even if it does, it will only be a matter of time until it comes back - it will keep coming back until the underlying fault is resolved.
You can also reset the transmission by turning the key to position 2 (all the way without starting the car or pressing the start/stop button twice with foot OFF the brake) and pushing the accelerator pedal to the floor for 2min. Again, the fault will likely return though until the underlying issue is addressed.
At this point, you can try the above as temporary fixes, but ultimately you will need to take the vehicle to a shop that has the proper equipment to read the fault memory so that the issue can be determined.
There is no other way to resolve failsafe - the fault memory must first be read out so that the issue can be identified. Once the issue is identified, the problem can be corrected, the warning switched off, and normal transmission operation restored.
As for the steering wheel button issue, this is most commonly caused by a failed slip ring (aka coil spring aka clock spring) which is the device which allows electrical signals to be passed from the wheel to the car while the wheen is still free to spin.
I hope that is helpful, please let me know if you have further questions, or if I can clarify anything for you.
Best wishes to you on your repairs.
If satisfied with my assistance, please press the green "ACCEPT" button so that I may be credited for helping today. I am not credited or compensated whatsoever until you press the green ACCEPT button.
>>>>>PLEASE DO NOT FORGET TO PRESS ACCEPT <<<<<
thank you in advance.