SL/R231: Went to start car this morning....
Thanks!




Thanks!
How are the batteries? (Key fob)
Other thing that comes to mind is, did you have the key in your pocket as you were working out? Perspiration can affect electronics 😉
Last edited by crconsulting; Mar 21, 2022 at 10:20 AM.




Also see my edit above about perspiration. I’m a cyclist and have first hand experience on how much perspiration can damage electronics. 🙁
Perspiration can be pretty corrosive.
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The R231 (as well as faceliff E550’s) use a different EIS. As well as DAS4. R231’s is not interchangeable either. While nothing is impossible, I have yet to hear/see/read of an EIS failure on R231.
OP stores his key in his car, which discharges key batteries quicker.
I would start with the easiest solutions first. Switch fobs, Yes, it sould trigger a key not found but I would always try that as a first step in diagnostics. If it is an EIS failure, it will store a code. So if it happens again, I would see if you can use your fob as a key in the ignition. I would at that point, also see what codes are stored.
Also jrupp, Did you unlock the car with your FOB?
Last edited by crconsulting; Mar 21, 2022 at 05:08 PM.
OP stores his key in his car, which discharges key batteries quicker.
I would start with the easiest solutions first. Switch fobs, Yes, it sould trigger a key not found but I would always try that as a first step in diagnostics. If it is an EIS failure, it will store a code. So if it happens again, I would see if you can use your fob as a key in the ignition. I would at that point, also see what codes are stored.
Also jrupp, Did you unlock the car with your FOB?




Start with the basics before moving straight to amputation 😀
Battery can show good voltage but still need replacement. Have it load tested first. and/or see what codes are stored.
Also not sure you mentioned it but, how old is your (main) battery?
https://batteryfever.com/
Last edited by crconsulting; Mar 23, 2022 at 07:54 PM.
Battery can show good voltage but still need replacement. Have it load tested first. and/or see what codes are stored.
Also not sure you mentioned it but, how old is your (main) battery?
https://batteryfever.com/




Big Al Di Meola and John McLaughlin fan though. 👍 (probably showing my age 😀 )
Hopefully the stored codes will give your indie some insight on what’s going on there.
You may have to record them & clear to see if anything triggers an immediate code once cleared.
Good Luck
Big Al Di Meola and John McLaughlin fan though. 👍 (probably showing my age 😀 )
Hopefully the stored codes will give your indie some insight on what’s going on there.
You may have to record them & clear to see if anything triggers an immediate code once cleared.
Good Luck
With that in mind I made an appointment with an indy next week in our capital city about two hours away. I used this shop when I had my 1986 560 SL and was impressed with their work and my interaction with them. I realize this SL is a different beast from my R107 but they assured me they had the same software as the dealer and could find any gremlins. I have set up several business meetings in town that day so I'll drop the car off, go to work, and hopefully get some good news by the end of the day. Fingers crossed. Thanks for all your input.




I can’t tell you how many times I’ve heard people say they scanned their car and no codes were present. Following a scan with XENTRY, half a dozen codes came up.
Make sure they’re using XENTRY. If they’re using the same software as the dealer, that should be what they’re using. Probably passthru version, but that’s fine.
Battery would have been an easy one though 🙁. Make sure they check all the auxiliary connections on the trunk battery cables making sure they are tight and check the battery terminal relay box (see pic on eBay link) to make sure everything is tight (they’ll know where it is). If they’re competent, they’ll start with the basics first. Loose or corroded connectors are the cause of many intermittent electrical issues. (Kinda like an old Marshall Stack 😀 ) Has the car ever been jump started?
https://www.ebay.com/itm/123823560096
Good Luck
Last edited by crconsulting; Mar 25, 2022 at 12:16 AM.
I can’t tell you how many times I’ve heard people say they scanned their car and no codes were present. Following a scan with XENTRY, half a dozen codes came up.
Make sure they’re using XENTRY. If they’re using the same software as the dealer, that should be what they’re using. Probably passthru version, but that’s fine.
Battery would have been an easy one though 🙁. Make sure they check all the auxiliary connections on the trunk battery cables making sure they are tight and check the battery terminal relay box (see pic on eBay link) to make sure everything is tight (they’ll know where it is). If they’re competent, they’ll start with the basics first. Loose or corroded connectors are the cause of many intermittent electrical issues. (Kinda like an old Marshall Stack 😀 ) Has the car ever been jump started?
https://www.ebay.com/itm/123823560096
Good Luck





