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Old 09-01-2020, 03:02 PM
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Join Date: Aug 2020
Location: California
Posts: 11
R129 trying out for a Stephen King movie

Did the dreaded heater core and wound up with more problems than I can mention in a single thread. I finally just jury rigged the A/C heater controls to get A/C, don't care about heat. Went to drive the thing down to the tire store to get a leaking tire repaired and now the ASR light is on the throttle is in limp mode the tach does not work and God only knows what else is wrong with it. I checked pin 6 for the ASR and am getting a code 30. Problem is that I have not found anything that gives information on codes. I have found several web sites that list the ports and how to obtain the codes but fine, now that I have a code what does it mean. A thousand years ago I had a printout of all the codes but it is lost somewhere in my absolutely impeccable garage.
I did cancel the code but it came back as soon as I started it up. In the past if I disconnected the battery the system would reset but not so now. Way back, I cured the problem with the throttle linkage adjustment but that is not working. Since I got out of racing I no longer have a car carrier otherwise it would be on its way to the middle of the desert for a barbecue.
Any suggestions?

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Old 09-03-2020, 08:16 PM
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Join Date: Aug 2020
Location: California
Posts: 11
For anyone looking for answers, when the dominoes stopped falling, I had an ASR light with the throttle in limp mode. A dead instrument cluster, inoperative A/C controls and no interior lights.

Checked the main fuse panel and found that the feed for fuses 1,2 and 3 were dead. I did not want to crawl under the dash to try to trace them so just jumpered them on the back of the fuse panel. To be clear those fuses are for lighting; park, tail, license plate, fog, cluster illumination, and headlight cleaning system.

Started it up and the ASR light is off and the electronic throttle is functioning. The instrument cluster is back on line. The A/C controls are functioning correctly. The interior lights are still not responding to the door switches but I will take what I have and be satisfied.

Hopefully I have satisfied the Mercedes gods and it will run for a while now.
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Old 09-09-2020, 04:40 PM
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Join Date: Dec 2002
Location: New Castle County, DE
Posts: 1,068
Unless the jumpers have a Benz p/n on them the car will reject them
'79 6.9 Sold (after 27 years of ownership)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'95 E320 sedan
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon
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Old 09-15-2020, 01:43 PM
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Join Date: Aug 2020
Location: California
Posts: 11
hanno, you were right. The jumpers are back off turns out that they were not the issue but moving the wires around under the fuse block and relay center was what changed things. There appears to be a connection problem behind the dash that comes and goes depending on how you position the wires. I have no intention of removing the dash to trace the wires and possibly find out what and where. If it quits working again I will flip a coin to see if I attempt to fix it or apply 5 gallons of gas and a match.

Right now the wires are positioned so that everything is working. I did attach some Yugo parts with zip ties. Apparently the Mercedes considers it an upgrade and is happy at least for the present.

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