I have a 92 300E (2.6L) with 139K miles and the SRS light was constantly ON. It seems that the light turned on as I was moving the driver's seat backwards. The car has the newer W124 steering wheel and air bag, the seat belts and receiver units work fine.

I tested the voltage while the car was running and it is a constant 14.34 Volts. I conducted a few tests to resolve the SRS light being always ON. I did a few simple tests without a code reader (I don't have one). Here is what I did:

- Moved driver's seat all the way forward and raised rear of seat all the way up
- Disconnect battery (negative side only)
- Check wiring under of seat - all wiring looked good
- Disconnected red connector from seat belt receiver and then reconnected
- Connected battery again

I then turned the key to the second position and all the warning lights came on except the SRS and ABS lights (never came on at all). It seems that a pre-check of the SRS and ABS system did not occur.

I then disconnected the battery and disconnected the red connector under the seat and left it unplugged. I connected the battery again and turned the key. Once again, no SRS or ABS lights ignited during pre-check. Shouldn't that SRS light come on since the seat belt receiver was unplugged?

Does a code need to be cleared so that the pre-check occurs? Is there a dependency between SRS & ABS? All the other warning lights work fine.

I would appreciate your assistance since I am concerned that their is a safety issue. The SRS constant ON problem went away but now I have a problem that both the SRS and ABS light don't come on upon system checking. Thanks.

Louis

Your car has no "codes" that need to be "cleared." ABS is powered through the Over-Voltage Protection (OVP) relay. Does yours work? (If the tach works, OVP works.)

SRS is NOT powered through OVP nor is it fused. Please first check the SRS and ABS lamps in the instrument cluster and report.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
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