Results 1 to 9 of 9

Thread: Question about Codes and a weird "Check engine light stays on even when car is off" issue

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Senior Member
    Join Date
    Jul 2012

    Question about Codes and a weird "Check engine light stays on even when car is off" issue

    Firstly this is for my (Gerry's and Dave's old) 1995 Mercedes E320 Wagon. It has the 16 pin connector, and I have the little blink box code reader (two of them actually, as I keep one in each car). I had the check engine light come on the other day (right after it rained in CA) and I thought "meh, it is some silly code". So I scanned the codes, and "cleared" them (more on that in a sec) and the light went out. And then one drive cycle later, the light came back on (the red, CEL on the dash all the way to the right) and STAYED ON no matter what I did (even with the key out of the car).

    I poked around a bit, and saw some stuff about how it might be the Overload protection relay. So I disconnected the battery, and took a look at that little sucker.

    It had some moisture under the plastic flip top "cap" over the 15 A fuse. I took it out, and cleaned it all out with contact cleaner, and let it dry. Then I put the Overload Relay back, and I ziptied a plastic baggie over it in case it was getting moisture from some place.

    Everything was good for a bit, and then the lights came back....

    Note that the car doesn't seem to have ANY issues. It runs and drives fine, and doesn't seem to have any problems that I can notice.

    I just went out and re-scanned the codes, and here's what I got:

    Pin 3
    Code 17 - Data Exchange between Modules

    Pin 6
    Code 5 - Left front seatbelt switch
    Code 9 - SRS Malfunction or time limit for erasing exceeded

    Pin 14
    Code 6 - Safety Contact Switch | Stop Lamp Switch

    Now, I was able to easily clear the Code 6 on Pin 14, but the others didn't seem to want to clear. Is there some trick to clearing them? The instructions say read the code, and then press the button for 8-10 seconds and it should clear. But when I re-read the codes, they seem to not be cleared.

    Ideas? I ordered a new Overload Protection Relay, but it won't be here for a bit. It also weirds me out that a check engine light stays on ALL the time.

    Thanks in advance.

  2. The Following User Says Thank You to Dbreid For This Useful Post:

    TerryA (11-13-2017)

Similar Threads

  1. Cluster Light on; the one left of the check engine light
    By Stevester 500E in forum Off-Topic Discussions
    Replies: 3
    Last Post: 03-14-2017, 12:04 PM
  2. Check engine light stays on after removing ignition
    By kre8tive202 in forum M119 Engine
    Replies: 14
    Last Post: 10-24-2016, 05:06 PM
  3. Replies: 14
    Last Post: 06-09-2014, 05:49 AM
  4. Replies: 18
    Last Post: 02-16-2013, 01:37 PM
  5. Issue - CHECK ENGINE light & blink code #4
    By 500Espot in forum De-Coding
    Replies: 0
    Last Post: 07-11-2009, 08:26 AM


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts