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Old 10-25-2009, 01:10 AM   #1 (permalink)
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Date registered: Oct 2009
Vehicle: 1995 E320 Cabriolet
Location: Seattle
Posts: 5
1995 E320 SRS light flickering

Hi Everyone,

I just purchased a 1995 E320 Cabriolet with 101000 miles on it. The SRS light will occasionally stay on for up to 30-40 seconds after starting the car and will occasionally flicker when driving. During a pre purchase inspection with MB they put a possible bad contact spiral, which I had replaced. It did not do any good, as the SRS light is still doing the same thing. Any ideas on other possible causes? Any help would be greatly appreciated.
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Old 10-25-2009, 07:23 AM   #2 (permalink)
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Quote:
Originally Posted by darcon View Post
Hi Everyone,

I just purchased a 1995 E320 Cabriolet with 101000 miles on it. The SRS light will occasionally stay on for up to 30-40 seconds after starting the car and will occasionally flicker when driving. During a pre purchase inspection with MB they put a possible bad contact spiral, which I had replaced. It did not do any good, as the SRS light is still doing the same thing. Any ideas on other possible causes? Any help would be greatly appreciated.
There's a red plug under the passanger floormatt... remove the floormat and look toward the front of the footwell, unplug and check the terminals for corrosion or other.

Plug it back and test.

There are also smaller red plugs under each front seat (if you have passanger airbag). Check those too.
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Old 10-25-2009, 03:22 PM   #3 (permalink)
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Date registered: Oct 2009
Vehicle: 1995 e320 Wagon
Location: Atlanta, Georgia
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95 e320 wagon with similar SRS light issue

Hi,

I purchased an e320 wagon about two weeks ago and mine had a similar problem. The local independant servicer fixed it by replacing the a sensor on the front brakes, so you may with to check those.

Mine flickered while I was driving along and would sometimes stay on for a few moments. It has been resolved now

Regards
Chris
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Old 10-25-2009, 03:50 PM   #4 (permalink)
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Also check for fault codes on pin 6 of the 16 pin connector.
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Old 10-25-2009, 05:29 PM   #5 (permalink)
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Date registered: Oct 2009
Vehicle: 1995 E320 Cabriolet
Location: Seattle
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Thank you MiguelXJ, chris-anderson, and deanyel. I really appreciate your input. I checked the connections in the red plug under the plate in the passenger floor board and they looked clean and and I could see no corrosion Miguel. I could not see the ones under the seat. I will have to locate them and give them a look. Thanks Chris, what you had done sounds very promising and I will definately have this checked, and will have the sensors checked. Do you know what sensor it was? Deanyel, I have not had good success finding a OBD1 reader for this car. I purchesed one, but it turned out to be OBD2. Do you know of a decent OBD1 reader with codes? Thanks again everyone.
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Old 10-25-2009, 07:28 PM   #6 (permalink)
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Apparently some OBDI code readers are sold on eBay but most just build their own. Try a search - lots of info in the files.
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Old 10-26-2009, 04:42 PM   #7 (permalink)
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Vehicle: 1995 E300 Diesel, 1994 S350 TurboDiesel, 1992 Ford F250 7.3L IDI Diesel, 1996 MotoGuzzi Sport 1100
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Possible causes for flickering SRS light

Another common cause of problems with the A/C, SRS and ABS lights and systems are the OVP (Over Voltage Protection) relay under the hood on the passenger side and/or the ignition switch. Try jiggling the ignition switch to see if it has any effect on the SRS light coming on and off. Mine didn't, but my blower motor and CCU (Climate Control Unit) which now don't work cause both the SRS light and the ABS light to come on if I don't turn the climate control off. The light doesn't exactly flicker, it either comes on of stays off, but it is definitely linked to voltage and affected by other systems in the car. My assumption (not fully proven yet) is that anytime the voltage is not proper (caused by blower going out and pulling too many amps, bad voltage regulator, bad OVP, bad CCU or any of several other systems) the SRS and sometimes even the ABS turn themselves off so that they won't work improperly. Even a failing (but not yet bad) battery can sometimes cause these sorts of issues.

As far as the OBP switch, if the voltage goes out of range - drops too low (frequently caused by the voltage regulator on the alternator getting too worn) or goes too high - the OVP can kick in and to protect the engine management modules it will shut various systems down and go into limp mode. When this relay goes bad (some folks have opened it up and found faulty solders or cracked circuit boards) this can affect voltage and systems such as the SRS and ABS.

I'm working on a troubleshooting doc (taken pics and collected posts, but that is all) on tracking down A/C and voltage faults that affect these systems working for cheapest and easiest to troubleshoot/fix to most expensive and difficult to fix, but it isn't done yet. I would check these in this order:
  • Alternator/system voltage - costs ~$300 new, but new voltage regulator fixes it often for cheap.
  • battery/battery voltage - costly, but really easy to fix at $100+ or so (I got two 875CCA batteries for my F250 7.3L IDI Diesel for $100 even each recently)
  • voltage regulator on alternator - costs around $40
  • OVP relay - costs around $50
  • ignition switch - probably over $100 used

I hope this helps,
austxjr
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Old 10-27-2009, 08:18 PM   #8 (permalink)
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Date registered: Oct 2009
Vehicle: 1995 e320 Wagon
Location: Atlanta, Georgia
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Brake Sensor

To answer your question it was the sensor that goes into the brake pad, apparently the previous owner had replaced the pads but not the sensors and a wire was damaged. The new sensor was less than $10!

Thanks & good luck
Chris
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Old 11-10-2009, 03:44 PM   #9 (permalink)
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I had BRAKE light flicker, and it turned out to be sensor. Very pleased that i did not have to buy new pads/rotors.
PL
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previously: '95 E320 Cab/02 S55/E320 wagon/'01 E55/'95 BMW 525i/'00 E320 Lorinser wagon/'89 Porsche Cab/'95 Lexus SC400/'00 BMW X5 4.4i/'99 C230K Sport/00 Porsche Boxster S/'93 MB 600SL/'90 Porsche 928/93 Porsche 968/'90 Infiniti Q45/90 Acura Integra/'88 Porsche 944T/'83 Porsche 944/'82 Toyota Supra
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Old 11-10-2009, 05:39 PM   #10 (permalink)
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Date registered: Oct 2009
Vehicle: 1995 E320 Cabriolet
Location: Seattle
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Thanks Everyone: Sorry, computer down a while upgrading to Win7

Thanks to everyone who responded so far. I have checked some of the things suggested with no luck so far, but at least they are eliminated as possibilities. I am beginning to suspect it is a sensor, bzliteyear. I checked the brakepad sensors Chris, but they all looked ok as the wiring goes. Thanks for getting back to me with that. No visible damage that I could see. Austxjr, I will check the voltages and relays that you suggest. I would also be interested in checking out your troubleshooting doc when you have it completed. It sounds very interesting. I know I will eventually have to take her in for further diagnostics, but I would like to get better at troubleshooting and repairing this fine car myself (within my limits).
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