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Old 03-06-2000, 05:07 AM
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Join Date: May 1999
Location: New Location: VA Palo Alto HEALTH CARE SERVICES
Posts: 109
This warning light for ABS of 420 SEL stays on all the time. I manage to locate the sensors at the spindle and visually check it. I used brake cleaner to clean the sensors and its casing good. All four sensors was cleaned and inspected, no visible damaged found, ..however, the light remains on. Any advice that you can recommend what else do I need to check. Thanks....
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Old 03-06-2000, 08:52 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Two things. The overvoltage relay must be good for this to work properly.
You can take apart the connector for the sensors and check them. Check for resistance and do the wiggle test on the wires.

1981 280GE SWB
1987 16V

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Old 08-13-2002, 02:02 AM
Manuel 300CE
Posts: n/a
how to check for bad OVP relay

I have a similar problem with my 1993 300CE coupe -- battery went low and I had to jump-start it.

Light stayed on since then... is there a procedure to diagnose this?? Also, WHERE is the OVP relay found ??

Dealer cannot seem to fix it, and are somewhat "clueless" IMO.

Thanks -- Manuel
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Old 08-13-2002, 02:10 PM
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Join Date: Apr 2002
Location: Surrey, Uk
Posts: 254
OVP is under the plastic cover behind the battery. It has a plastic cover on top with a fuse inside. Fuse can blow when jumper leads connected.
Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)
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Old 08-13-2002, 02:31 PM
Manuel 300CE
Posts: n/a
thanks !! found and fixed it

Looked into it -- turns out blue (15 A) fuse was blown when I did the last jump start.

Replaced fuse, and ABS lamp is no longer ON.

Thanks for the help. I'll post pictures of the W124 OVP later.


Side question: when I was replacing the black plastic cover, parts of it cracked. I infer it went brittle due to age. I'll replace this later -- any risk in leaving it partly cracked (i.e., it won't keep ALL the water off the relays, etc).
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Old 08-13-2002, 02:50 PM
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
I don't know how much of a breach you have with those cracks, but for now, duct tape the damaged portions until you can get a replacement.

Enough moisture (i.e. driving rain at highway speeds perhaps?) will cause all sorts of running problems. I believe there is a current thread in this forum on just such an incident...
2009 ML350 (84K) - Family vehicle
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Old 08-13-2002, 02:55 PM
Manuel 300CE
Posts: n/a
picture of W124 OVP relay

picture of my relay below

Last edited by Manuel 300CE; 08-13-2002 at 03:02 PM.
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