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  #1  
Old 05-16-2015, 03:18 PM
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1992 RHD W124 300TD Estate--Immobilizer???!!!!

Hi All,

I have a new-to-me Benz, and it is an RHD UK version. Automatic.

I am having, from what I can tell from the research, a 'typical' problem with the car not starting, lights sticking on/flashing, until I mess about with the key fob. I've put in a new battery, but it is being drained either by the immobilizer/security system or I have a separate parasitic loss problem...HIGHLY unlikely given the known good history of the car.

I have searched for several hours for where to locate the electronic bits (ECU, wires, harnesses, relays, etc.) so I can PERMANENTLY disable the stupid immobilizer before I drive the car off a cliff. There are plenty close by.

I have seen the images on Mercedes forums and on Google images and on Ken Bergsma's site, but all of the images show the items I'm looking for either under passenger or driver's side of dash. My car has no such feature/s. Under the passenger side is a quite unassuming, but RED, harness that is for the air bags. Not gonna touch it. There is no other harness as some pictures show. There is nothing else under there but a steel panel that, once removed, shows that there is nothing hiding there but dust bunnies.

Under the dash on the drivers side are also no such black boxes or harnesses or anything that I can tell. I don't know if this is because the car is an estate and the stuff I'm looking for was moved to another location unique to an estate (like under the rear seat or in the boot) or what.

I hope someone can shed some light on this. I am also posting a similar post on the other forums I'm familiar with (peach parts, mbuk, etc.).

Thanks in advance! I think the car could be great, but at the moment it is an enormous pain in the arse!!!!

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1982 240d RHD OM605 & 5spd swap


1982 240D LHD/RHD & 300TD LHD / 1983 300SD LHD / 1986 300SDL LHD / 1992 300TD RHD / 1998 C250 TD RHD


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  #2  
Old 05-17-2015, 03:37 PM
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  #3  
Old 05-17-2015, 09:02 PM
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Did you look under the right front Floormat under the panel there? That's where it is on USA wagons... Of course, there's no steering wheel there on our cars...
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  #4  
Old 05-18-2015, 04:20 AM
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Quote:
Originally Posted by vstech View Post
Did you look under the right front Floormat under the panel there? That's where it is on USA wagons... Of course, there's no steering wheel there on our cars...
The offending black box was behind the glove box!!! ARG.
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  #5  
Old 05-18-2015, 04:21 AM
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Update:

The update for today is that I removed the glove box and found the LaserLine control box in there. It has been temporarily disconnected. There was also a cylinder in the left side of the glove box where it appears one would insert a key and that key would do something....but I don't know and the keys I have don't fit it. It is also disconnected.

I was hoping this would be the end of my problems. After disabling those items, I let the car run for 15 minutes then drove it for 30 minutes, some of that at motorway speeds. My hope was this would give the battery a decent charge. Charging it via the alternator is no substitute for charging it on a battery charger, but I was hoping for the best.

This morning I turned the key and it barely turned over, but it did start relatively quickly. The ABS light stuck on brightly, then it dimmed, then it went off. The wiper came on by itself and did a few swipes then turned off.

Do I perhaps have water somewhere it shouldn't be that is causing these electrical gremlins?

I did look under the rear seats, and sure enough under the driver's side rear seat water has infiltrated under the vacuum pump that controls the door locks. I'm fairly certain it's from the compromised rear window seals that permit water to leak down into various compartments. I digress....
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1982 240d RHD OM605 & 5spd swap


1982 240D LHD/RHD & 300TD LHD / 1983 300SD LHD / 1986 300SDL LHD / 1992 300TD RHD / 1998 C250 TD RHD


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  #6  
Old 06-08-2015, 01:56 PM
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Update:

The laserline alarm has been disconnected. It was located behind the glove box!

That has helped with *some* of the starting issues, but not all of them. The lights no longer go on/off, but now the wiper still goes on by itself and the car *occasionally* turns over quite slowly and sometimes it starts but sometimes I need a jump. Three days ago, I installed a new voltage regulator and was so certain this was the solution to the problem, but after driving the car several hundred miles this weekend it appears this is not the issue. I needed a jump one time as the battery went flat after cranking it for 20-40 seconds, and another time turned over but only eventually started.

When the car is running, according to my multimeter, the battery is at 13v between posts as well as post to alternator. It's at 12 with the car off between posts and post to ground. My multimeter is an old one and apparently only shows whole numbers (no decimals). Something is working with the alternator/voltage regulator, but either it's not working 100% or there is some other gremlin draining the battery while the car is turned off.

I've tried to do some testing to reveal parasitic loss, but my brain is fried at the moment.

Any ideas are *greatly* appreciated.
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1982 240d RHD OM605 & 5spd swap


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  #7  
Old 06-08-2015, 03:00 PM
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Another update:

I removed the OVP relay. It is the original from 1992 and is a 7 pin. The car acts exactly the same without it, but the ABS light is on and tach doesn't work as is to be expected with no OVP relay. But the idle is the same. Not sure if that means anything.

When I began these tests about 20 minutes ago, I turned the ignition to on but did not start the car. I forgot to turn it off. When I came back, it nearly did not start. I turned the key off again. The next attempt, the damn thing fired right up!!!!

This thing is super frustrating.
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1982 240d RHD OM605 & 5spd swap


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www.repaircafeglasgow.org
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  #8  
Old 06-08-2015, 06:57 PM
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If I were you I'd leave the keys in the house then start to remove each individual fuse and put a current meter across the fuse terminals to see if any current is being consumed. Any thing above 0 should be suspect. Then determine what's on the circuit clock will draw a small amount etc. you will find it.
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  #9  
Old 06-08-2015, 11:11 PM
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After all of this draining and charging you should also make sure your battery is still good with a load test. low battery voltage can cause some rather annoying/intermittent problems.
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  #10  
Old 06-09-2015, 05:28 AM
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Quote:
Originally Posted by dieselbenz1 View Post
If I were you I'd leave the keys in the house then start to remove each individual fuse and put a current meter across the fuse terminals to see if any current is being consumed. Any thing above 0 should be suspect. Then determine what's on the circuit clock will draw a small amount etc. you will find it.
What's a current meter? Will a multimeter suffice/is it the same thing?

What is 'circuit clock'?

I'm handy with most things, but when it comes to electrical stuff you could explain it to me a thousand times and I'll still struggle!

Cheers
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1982 240d RHD OM605 & 5spd swap


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  #11  
Old 06-09-2015, 05:30 AM
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Quote:
Originally Posted by EJHumber View Post
After all of this draining and charging you should also make sure your battery is still good with a load test. low battery voltage can cause some rather annoying/intermittent problems.
Could this otherwise new battery already be toast after only several weeks of this? I don't have a tester, so I'll have to find somebody locally that 1) understands what I'm asking and 2) has the tools to measure that.

Sounds quite time consuming. God bless, and God curse, these old diesel Benzos.
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1982 240d RHD OM605 & 5spd swap


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  #12  
Old 06-09-2015, 06:37 AM
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Arrow

Quote:
Originally Posted by indybenz View Post
I removed the OVP relay. It is the original from 1992 and is a 7 pin. The car acts exactly the same without it, but the ABS light is on and tach doesn't work as is to be expected with no OVP relay. But the idle is the same. Not sure if that means anything.
That means ELR (electronic idle controlling system) is not working properly.

And could you post the VIN, please?
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  #13  
Old 06-09-2015, 09:35 AM
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VIN = WDB1241902F221467
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1982 240d RHD OM605 & 5spd swap


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  #14  
Old 06-10-2015, 08:28 AM
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So I just checked the fuses. The number 9 read 5-6 volts. That fuse controls:

diagnostic term.6, hazard warning system, clock, front roof light (electronic radio, vanity mirror light, relay comfort circuitry term.86)

Then I checked 'C', right next to it. It read 11 volts. I'm assuming this should not be reading this high. It controls:

rear roof light, trunk light, rear door locking system, safety belt handover alarm, sear back arrester (central locking system, door lights, reading lamps, aut. antenna.)

So have I found the drain? Or should 'C' be reading 11 volts?


Now that I'm reading through the manuals on w124performance.com, 'C' is on Circuit 30 which is apparently always 'hot', as is number 9. But should it be 11 volts 'hot', or some lesser amount?
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1982 240d RHD OM605 & 5spd swap


1982 240D LHD/RHD & 300TD LHD / 1983 300SD LHD / 1986 300SDL LHD / 1992 300TD RHD / 1998 C250 TD RHD


www.repaircafeglasgow.org

Last edited by indybenz; 06-10-2015 at 08:41 AM.
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  #15  
Old 06-10-2015, 01:31 PM
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OPV relay box might be the problem as i have read this on some other forum.

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