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1992 300E 2.6
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359 Posts
I wonder why the previous owner put that aftermarket alarm on there when came with its on alarm?
 

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1992 300E 2.6
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359 Posts
remove all traces of the aftermarket crap, restore all circuits to stock.
I guess I'll have to take to shop, Because I don't know what all is aftermarket and who to get the circuits back to stock.

I see one red wire that doesn't look like it is stock over there near were the main alarm plugs are. But someone would have to walk me through trying to remove everything else and restore circuits.
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
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7,229 Posts
I'd look under the back seat, too, where the convenience module, and lock vacuum pump actuator is located.

unluckily, my model 124 service manual, the wiring diagrams (ETM or Electronic Troubleshooting Manual, in Mercedes parlance) is missing the alarm stuff for your car, it has 86-89 diesel wagons, and it has 93+ everything).
 

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1992 300E 2.6
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359 Posts
OK, Thanks for looking. If anybody has the wiring diagrams (ETM or Electronic Troubleshooting Manual, in Mercedes parlance) alarm info for a '92 W124 let me know.
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
Joined
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7,229 Posts
afaik, the Model 124 Service Manual thats available simply doesn't have that page. maybe a dealer would have it on old microfiche or something, but it never mdae it onto the CD version they distributed.

here's the 93+ 6 cyl sedan ATA (alarm): 24821500.pdf
and central locking: 2480300.pdf
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
Hello everybody,

How do I disable my '95 E320C antitheft alarm? My module is white and has only one plug, part# is 1408206726. Car comes from Italy. Simply unplugging the module disables the starter.

http://i.ebayimg.com/10/!CChGBEgBGk~$%28KGrHqUOKj8EzYVfgwz-BNL,g,jVCw~~_35.JPG

Data card sais I have:
885 - HIGHTEN THEFT PROTECTION

Thanks!
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
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7,229 Posts

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
That's the way the module looks like, small difference in part# though. I am not good at electrical stuff, anyway you think I can bypass in this CAN system? I am not sure the electrical diagram from w124-zone.com is relevant for this car or if the K38 relay is indeed behind the instrument cluster - but I will check.
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
After the car agreed to recognise the key and started and worked very well for a while something new appeared: It cranks fine but power supply doesn't reach fuel pump, no presusre on check valve so engine doesn't start. Replaced two OVP, nothing. Pump works, I put 12V at the connection under the back seat and it immediatelly "buzzed" like before.
No warning sign before. One day just refused to start.
If this is again immobiliser related does anybody knows how can I get rid of it? Can I get wiring diagram for THIS car if I buy acces to WIS?

Regards,
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
its quite possible the immobilizer function is canbus integrated, which means its tied into the ECM (engine control module)
DAS - drive authorisation system activated? But why? Don't tell me replacing front turn lights can do this, that's all I did to the car...
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
Joined
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7,229 Posts
the K38 immobilizer relay on the US cars disables the starter motor, nothing else.

the wiring diagrams to US model 124's are here, note that 93-95 are below the section for the older cars.
24 Electrical Troubleshooting

I have no idea where you'd find wiring diagrams for non-US engines, however.
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
Thanks, I will search, print and hopefully fix it. This engine runs like new, if it starts... :(
 

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'95 E320, 221k miles, fair cond
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608 Posts
I had this funky problem happen to my 95 E320. This plus the alarm, central lock and radio speaker do not work.

How old is your battery? Have it checked.

I replaced mine and the alarm, central lock, and radio speaker is now working. The alarm, immobilizer, and radio I think are linked to the ATA module on the passenger floor. It acts funky if voltage is too low.

Edit: i just jinxed myself because my radio and central locking isn't working again despite the new battery. But I'm not having anymore alarm nor immobilizer issue (fingers crossed).

Sent from my iPhone using Tapatalk
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
How old is your battery? Have it checked.
You are right, battery is old. It actually died when I tried to start it a month ago. Took it off and recharged for several days with Optimate 6. It was ready next morning but I had no time for it so tester maintained/charged according to its program. Starter turns very well now but nothing else happens.
Car came without radio but worked fine and I don't miss it. For now.
I will try to read the diagrams and search for more info. I don't want the alarm, I want the car to run. Whatever it takes...
Home made code reader is under construction.
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
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7,229 Posts
if the car is cranking over, then the ATA imobilizer is NOT your problem, as it stops the starter motor only.

for a engine to run, you need fuel, compression, and spark. verify that you have fuel pressure when cranking, and that you've got spark. if you have neither, I'd start at the CPS (crankshaft position sensor) as its the source of all timing.
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
No power going to fuel pump, checked that, so no fuel at the control valve, checked that. Fed 12V to the pump and it runs but I was alone and couldn't crank the engine.
Will check spark on Saturday.
I turned off the engine last time in the parking place and it was running top. I assume 30days off should not affect compression.
 

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Premium Member
1990 Benz 300E 2.6 (mine) ; 1994 E320 Wagon (wife's) ; 1993 300CE Cabrio, needs some TLC
Joined
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7,229 Posts
the fuel pump normally only runs like a second or so when you switch the ignition on, then stops until the engine is turning over. 1 second after the engine stops turning over, the fuel pump shuts off again.
 

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'89 S124 200D / '95 C124 E320 dogleg / '95 rod bender
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81 Posts
Yes, I have two identical relays, tried both, nothing. They worked when removed from donor cars. I learned about OVP when my 4 cyl diesel wagon had intermitent ABS light on. This one is a '95 E320C M104992
Fuel pump doesn't go on at all, not even for that second.
 
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