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95 S420 ASR/SRS/Check Engine Light

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Old Oct 6, 2008 | 05:37 PM
  #1  
mtoler001's Avatar
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Default 95 S420 ASR/SRS/Check Engine Light

ASR light comes on in the morning especially when cold, must let it come up to regular temp or I must drive it then shut it off for 3-5 minutes then back to normal. Check engine light coming on too and occasional SRS light too. I will be having it checked out but wanted to know if anyone had some thoughts. Car runs perfect at idle. Only has 112K miles on it. Transmission shifts perfect. I am hoping for something minor.
 
Old Oct 6, 2008 | 07:28 PM
  #2  
wmercer's Avatar
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Default RE: 95 S420 ASR/SRS/Check Engine Light

Unfortunately, could be several factors. But with such different systems showing error light, I would consider (I know by experience):
- Battery condition, these cars need a strong battery.
- Alternator condition, same as above.
Below 11.5 volts on these cars (such as in morning starts), causes these symptoms, as well as a defect in each of these systems components.
-Also consider brake light switch.
-Worst case (wiring harness-mostly engine area, I know that the hard way also)


Best to verify at a shop, condition of battery and alternator, andget the error codes read.
 
Old Oct 6, 2008 | 11:38 PM
  #3  
MBTECHINFO's Avatar
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Default RE: 95 S420 ASR/SRS/Check Engine Light

High likelihood of Throttle actuator failure usually due to shorting inside the harness, this will throw the ASR and CEL lights. There is also a good chance that the engine harness could be bad (insulation cracking/wires shorting). SRS is likely a seat belt buckle but it is difficult to diagnose anything without a diagnostic test
 
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