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  #1  
Old 12-29-2001, 08:24 PM
David C Klasse's Avatar
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Location: Mission Hills in the City of San Diego
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Angry SRS Light Constant ON!

Today I was leaving the grocery store, and I noticed my SRS light was on... and it didn't turn off! I stayed in the car for about 5 minutes hoping it would turn off (lesser malfunction when only on for temp time at startup)... so I have a constant SRS light now! Everything else is fine with the car.
I do have one thought though... about 1/3 of the time, when I engage the rear defroster, the light flashes, indicating a low voltage.. it always will come back on (steady) a few moments later. My chargine system seems just fine though... along with my really new MB battery. No other low voltage/no starting symptoms whatsoever. Well I decided to check out my owner's manual, and it said that low voltage could trigger the SRS light.
My question, how low must the voltage go for the SRS system to detect a malfunction? My ABS light is not/nor was on at all. So if this is the case, I'm thinking that the voltage would have to be the min voltage that the ABS needs to function properly.
I hope that made sense.. thanks!
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #2  
Old 12-29-2001, 09:15 PM
Clauser1
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David,
Check your alternator output.When my srs
light started flickering,I found out my alt.
is going south.
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  #3  
Old 12-29-2001, 10:52 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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How do I check my alternator output? I believe I can check it through the climate control...?
My SRS light is constantly on... no matter what.. no flickering. But maybe my car's computer is different, holding a code and storing it.
Did your ABS light come on in congruence with the SRS light?
THanks. :p
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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  #4  
Old 12-30-2001, 01:18 AM
Brian16V
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I recall something about a blown OVP Relay fuse causing the SRS light to come on. Might want to do a search on this subject.

Brian16V
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  #5  
Old 12-30-2001, 01:30 AM
Clauser1
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David,
My ABS did not came on.What I did to
check my alt.is attached a multimeter to the
battery and have my son rev the engine at
about 2500rpm.You should have at least 13 1/2v.
if it stays at 12v.your not charging.In my case
thats what happened.New alternator.
Good Luck!
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  #6  
Old 12-31-2001, 03:29 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Dave, if system voltage drops below a certain point for a certain amount of time, the SRS will disable. I can't recall the voltage, but anything below 11 or 12 volts would be about right. Check the alternator output with a volt meter. Cigar lighter socket is an OK source inside the car. Test with no load at idle, record reading, put a load on (headlights, fan, rear defrost, etc). Bring the RPM's up to about 1500. If you're not getting at least 13 volts, I'd suspect the voltage regulator. A new battery would mask the decrease in charging capacity initially. If you drive a lot at night, it won't for long, but daytime driving is less stressful on the electrical system. Good Luck.
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1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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  #7  
Old 01-01-2002, 12:11 AM
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Join Date: Mar 2001
Posts: 326
If your battery hasn't quit on you by this posting you can safely assume that the charging system is working correctly. A battery that is not being charged or charged properly will simply not stay charged for very long.
The most common cause of the SRS light in W202 is one of the front seat belt buckles going bad. Retrieve the code and replace the suspect buckle if necessary.
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  #8  
Old 01-01-2002, 06:39 PM
David C Klasse's Avatar
CheFrac is Back!
 
Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Yeah, charging system seems just fine. Car starts right up every time. I will still check the voltage.
I already had an instance with the front seat belt buckle, with resulted in changing one of them... it's possible the other buckle could be faulty, but the SRS light would go out after a minute or two, it is now CONSTANTLY on, disabling the entire SRS system.
I was thinking though... the night before the SRS light went on, I replaced the door pin switch in my driver's door, removing the interior panelling on the B-pillar... the ETR is in there... maybe I did something with that... but then why did it come on quite some time later...
I'll just have to have the code checked...
Thanks a bunch.
Happy New Year! What a crazy night.....!!!!!!!!!!!!!!
__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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