View Full Version : SRS light is on

Jim Rosenthal
12-07-2013, 10:54 PM
1992 500E- SRS light is on. Where to start the process of figuring this out? Any suggestions appreciated.

12-07-2013, 11:17 PM
Pull codes to see what comes up. Reset, drive car and see if anything comes back. Then we can go to next steps.

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Jim Rosenthal
12-09-2013, 02:58 PM
Thanks. If I don't have a code reader, what do you advise to purchase to do this? Assuming there is an affordable one out there.

12-09-2013, 03:14 PM
You can make one that will read quite a good number of codes on your car's systems (all of the two digit blink codes, but not the more specific three-digit codes on a couple of systems, which require a more advanced scanner, HHT or Star C3/C4 computer).

Plans to make the tester (Radio Shack parts) are here: "Home Brew DTC Tool" http://www.k6jrf.com/MB_X11.html

Use GSXR's guide to reading the codes that is posted here: http://www.w124performance.com/docs/mb/diagnostics/DTC_List_W124_M119.pdf

This GSXR thread is a good how-to guide: http://www.500eboard.com/forums/showthread.php?2996-HOW-TO-Checking-DTC-s-%28Diagnostic-Trouble-Codes%29-on-the-500E-E500

Takes about 30 minutes to do a decent job at one. Reads most of the codes.

12-09-2013, 04:06 PM
The "Home Brew DTC Tool" http://www.k6jrf.com/MB_X11.html" is really easy and cheap to make.
I've had mine for a couple of years now.

Just go to Radio Shack and get the materials, then we'll see if there are any codes triggering your SRS light.
It may be something simple to fix.

12-09-2013, 05:31 PM
Or you can buy the factory item for... sit down.... $1000+ !!!
But it has a "Star" on it.


Jim Rosenthal
12-10-2013, 09:42 AM
Thanks, guys! I still have a soldering iron, I think I can build that. And thanks as always for the help.

12-10-2013, 09:57 AM
You can get away with the big banana plugs at Radio Shack as you'll just be using the pins in your pushbutton terminal ... no need for the small pins in the 38-pin connector. Per Dave's PDF doc there are only a sub-set of systems that are testable anyway.