Darn immobilizer! - PeachParts Mercedes-Benz Forum

Adriel · #1 06-09-2015, 05:12 PM

Apparently the '79 had one of those breath immobilizers, and when the P.O. got the van, it was ripped out, but the wiring not corrected. I found the paperwork once most of the interior was removed and found the hacked wiring once the dash was removed. Grrr...

So, does anyone have a picture of the ignition wiring for a '79? Or, is '85 the same?

Thank y'all in advance!

SD Blue · #2 06-09-2015, 05:49 PM

79 what?

Adriel · #3 06-09-2015, 07:04 PM

Quote:

Originally Posted by SD Blue

79 what?

Oops, forgot not in my signature.

I am parting out a 1979 W123 300TD, due to rust (now that I have it mostly apart, doesn't seem much). I would like to get the engine running so we can know what the situation is.

SD Blue · #4 06-09-2015, 07:35 PM

This should help you sort things out:

http://www.startekinfo.com/StarTek/outside/12265/disc_2/program/ETM/78_300.pdf

Charlie Foxtrot · #5 06-09-2015, 09:37 PM

If you are just trying to start the engine (not drive the car), you can hot wire the starter solenoid to get it to crank, and hot wire the injection pump fuel solenoid to allow fuel to get into the fuel injection system. Get the fuel flowing & crank the engine. If your compression is good, you will start. My guess is that it's hot enough in AZ that you won't need the glow plugs.

Adriel · #6 06-09-2015, 10:26 PM

Quote:

Originally Posted by SD Blue

This should help you sort things out:

http://www.startekinfo.com/StarTek/outside/12265/disc_2/program/ETM/78_300.pdf

Sam, bet it will!

Thank you so very much!

Quote:

Originally Posted by Charlie Foxtrot

If you are just trying to start the engine (not drive the car), you can hot wire the starter solenoid to get it to crank, and hot wire the injection pump fuel solenoid to allow fuel to get into the fuel injection system. Get the fuel flowing & crank the engine. If your compression is good, you will start. My guess is that it's hot enough in AZ that you won't need the glow plugs.

Charlie, thank you so very much for the help!

If I could "drive" it, be not only backup in an emergency, but could make it disappear when the landlord comes.

If she will not have it, will try again to hot wire; already tried once.

Oh, and cold today. Had a little rain and patches of clouds come and go. Bit odd for this time of the year, and June 5th and 6th set a record. Thats whey I have been pressing hard to get the Mercedes parted out.

Adriel · #7 06-10-2015, 04:00 PM

Okay, made a little progress until my Pastor came over and we got talking a lot longer than normal.

Did a high quality print and can't read the diagram. Tried online and worse.

All I have found from the diagram is it says two wires from the switch, but there is at least a half dozen. Did find a purple with white strip had been cut, so will repair that. However, not sure about the pink and the white, both soldered on without a connector and covered with a thick tape. Is this stock?

There are two white wires on the diagram off the ignition, but none on the actual, except the one soldered and goes no where. Says it goes to the N.S.W., which if I.R.C.C. is on the transmission. All the wires going into the tunnel look intact, so lost...

SD Blue · #8 06-10-2015, 05:18 PM

I see at least 4 wires from the diagram.

vi/wh
rd/bk
rd
rd

Can you read any markings on the switch? They may have uses some of the terminals that aren't normally used to switch the breathalyzer on. From what you describe, I'm betting that the parts wrapped in electrical tape are add-on's.

dude99 · #9 06-10-2015, 05:57 PM

Quote:

hot wire the injection pump fuel solenoid

Just for the record, there is no such piece on the om617. They all use a vacuum operated shutoff actuator. No wiring required, just unhook the hose and it will run.

Adriel · #10 06-10-2015, 06:09 PM

Quote:

Originally Posted by SD Blue

I see at least 4 wires from the diagram.

vi/wh
rd/bk
rd
rd

Can you read any markings on the switch? They may have uses some of the terminals that aren't normally used to switch the breathalyzer on. From what you describe, I'm betting that the parts wrapped in electrical tape are add-on's.

Thank you so very much for the help!

That doesn't match any on the back of the ignition switch, as you can see from the prior pictures I posted.

What it seems now that I have the N.S.S. wire back together is they used that to disable; does have 3Ohms of resistance though. If the foam taped wires are add on, then that would jive what you are saying; must have been for a power and ground for the device.

Almost got to trying to start, but being 95*, 40 percent humidity, with two thermals on, the warm weather was affecting my thinking and shorted the switch and almost instantly drained the truck battery. Tried to find my battery charger, but it's missing. So, think time to take a break?

Quote:

Originally Posted by dude99

Just for the record, there is no such piece on the om617. They all use a vacuum operated shutoff actuator. No wiring required, just unhook the hose and it will run.

Thank you so very much for the help!

Good, glad I didn't have to ask about that. The two lines are on the switch, but the H.V.A.C. and door lock hoses are disconnected, so bet that defiantly disable the shutoff.

Adriel · #11 06-10-2015, 10:07 PM

Quote:

Originally Posted by Charlie Foxtrot

If you are just trying to start the engine (not drive the car), you can hot wire the starter solenoid to get it to crank, and hot wire the injection pump fuel solenoid to allow fuel to get into the fuel injection system. Get the fuel flowing & crank the engine. If your compression is good, you will start. My guess is that it's hot enough in AZ that you won't need the glow plugs.

How does one hot wire it? In the past, tried using a screw driver across the terminals and did nothing. Took a hammer to it repeatedly and tried again and nothing. Spend at least an hour, gave up, and since didn't run, parted it out.

Charlie Foxtrot · #12 06-11-2015, 08:27 PM

Dude - you are correct (It was late, old age setting in, dog ate my home work...major brain spasm) yank the vac hose, fuel flows

Purple w/white stripe - in the '80s, that was the wire that was intercepted, cut and wired to a relay to defeat the starter from cranking when the alarm was active

Hot wire starter - there is a white wire attached to the starter solenoid - intercept it & give it 12VDC, solenoid closes, current flows to the starter motor, starter spins (all this presuposes an installed charged battery , a working solenoid & starter, an engine that will turn over freely, an intact ground to the engine)

Hammer?? Screw driver?? - seriously, those are for old Chevy's (not really, I've used 'em on Benz's too)

Adriel · #13 06-11-2015, 09:12 PM

Quote:

Originally Posted by Charlie Foxtrot

Purple w/white stripe - in the '80s, that was the wire that was intercepted, cut and wired to a relay to defeat the starter from cranking when the alarm was active

Hot wire starter - there is a white wire attached to the starter solenoid - intercept it & give it 12VDC, solenoid closes, current flows to the starter motor, starter spins (all this presuposes an installed charged battery , a working solenoid & starter, an engine that will turn over freely, an intact ground to the engine)

Hammer?? Screw driver?? - seriously, those are for old Chevy's (not really, I've used 'em on Benz's too)

Thank you so very much for the help!

Hmmm, interesting they use that instead of a power lead.

White, okay.

Actually learned that from the aircooled Volkswagen owners.

Charlie Foxtrot · #14 06-11-2015, 09:32 PM

Had an old type 1 when I was 15. Had to push start it mostly. I eventually perfected my (sledge) hammer technique on that little beastie! Took ten or eleven hits to reduce the engine to managable bits & pieces after it stranded me (for the last time). Moved on to a '51 Chevy DeLuxe.

Adriel · #15 06-12-2015, 12:18 AM

Quote:

Originally Posted by Charlie Foxtrot

Had an old type 1 when I was 15. Had to push start it mostly. I eventually perfected my (sledge) hammer technique on that little beastie! Took ten or eleven hits to reduce the engine to managable bits & pieces after it stranded me (for the last time). Moved on to a '51 Chevy DeLuxe.

Angry young man, huh?

Hope not a classic; be a shame. My Dad bought a 1964 Type 1 in 1968, which he still has and only quit driving her in about the early 2000's (tired of not having a radio). All us children were brought home in it, and I just found my pictures, including me going home from the hospital. Lot of found memories, including his college friend's 1971 Volkswagen Squareback. That is how I ended up with her. Used to be a Ford guy, but now just Mercedes and Volkswagen: friend said it best that I can't stay away from German steel.