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  #16  
Old 03-30-2006, 03:38 PM
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Quote:
Originally Posted by Brian Carlton
Check this again, please.

Position III will typically allow no function of any of the accessories during start including the CCU and the radio.

If the CCU and blower function in position II, then it's operating normally.
They function when I turn the key to II (i.e. glow plugs heating up, etc...). When I start the car, move to III, and the key returns to II I have no ACC unless I jiggle the key or flick it.

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  #17  
Old 03-30-2006, 03:46 PM
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Quote:
Originally Posted by peragro
They function when I turn the key to II (i.e. glow plugs heating up, etc...). When I start the car, move to III, and the key returns to II I have no ACC unless I jiggle the key or flick it.
When the problem manifests itself, leave the switch alone (in position II) and check fuses 5,6,7,and 8 for 12V. If they have no voltage, the switch is the culprit.

However, these fuses also control the rear defogger, outside temp display, cruise control, anti-lock brakes, and a slew of other functions...........so..........none of them should be operating if the switch fails to make contact.

Fuse 5 is specifically for the climate control, stop lamps, backup lamps and aux. fan.
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  #18  
Old 03-30-2006, 03:48 PM
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Quote:
Originally Posted by Brian Carlton
When the problem manifests itself, leave the switch alone (in position II) and check fuses 5,6,7,and 8 for 12V. If they have no voltage, the switch is the culprit.

However, these fuses also control the rear defogger, outside temp display, cruise control, anti-lock brakes, and a slew of other functions...........so..........none of them should be operating if the switch fails to make contact.

Fuse 5 is specifically for the climate control, stop lamps, backup lamps and aux. fan.
Will do, I'll take the multimeter with me. Were leaving here in a few minutes but I should have some down time to check things out.
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  #19  
Old 03-30-2006, 04:06 PM
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Perhaps but the jiggling in position II still points heavy to the switch
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  #20  
Old 07-26-2006, 12:13 AM
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Quote:
Originally Posted by meltedpanda
Perhaps but the jiggling in position II still points heavy to the switch
Oh yeah, it's the switch. I'll change it out one of these days. Now that I know it's the culprit I can move it just so and get ACC.
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  #21  
Old 07-26-2006, 01:13 AM
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Hey man, I've been reading your thread and it is so similar to the headache I am dealing with that I just want to hear the end of the story. My ACC does not allow the blower to function...so I hard wired it to the cig lighter. All vents work with the buttons so I can defrost and such. I also have like 5 other electrical gremlins which MAY be cured by replacing the electrical part of the ignition switch...but I'm scared to tackle that one as it seems right difficult. Plus I should probably do the tumbler piece as well...but frankly, the way it interlocks with the steering wheel spooks me to death....and I'm not so young that twisting upside-down under the dash is such a good idea anymore...ugh. I hope you bite the bullet before I do...let us know how the waters are...EJ
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  #22  
Old 07-26-2006, 01:37 AM
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Quote:
Originally Posted by Elktonjohn
Hey man, I've been reading your thread and it is so similar to the headache I am dealing with that I just want to hear the end of the story. My ACC does not allow the blower to function...so I hard wired it to the cig lighter. All vents work with the buttons so I can defrost and such. I also have like 5 other electrical gremlins which MAY be cured by replacing the electrical part of the ignition switch...but I'm scared to tackle that one as it seems right difficult. Plus I should probably do the tumbler piece as well...but frankly, the way it interlocks with the steering wheel spooks me to death....and I'm not so young that twisting upside-down under the dash is such a good idea anymore...ugh. I hope you bite the bullet before I do...let us know how the waters are...EJ
Well, EJ, I think eventually I'm going to have to bite the bullet and change out the electric part of the ignition. My SDL may be a little different than your SD, but I'm with you and not looking forward to it (Brian Carlton has both the SD and SDL and may have some more info on the changout for that model). I did replace the lock tumbler because it wasn't too difficult and I figure that if the electronic portion is wearing out the tumblers won't be far behind and I didn't want to be stranded. I was already getting a sticky feeling when I pulled the key sometimes. I'm gonna wait though, until the temperature here dips below 100F on a regular basis before I change that part out - probably around September or so.

Change out that key cylinder, I have a friend with same car as you. A few months ago he was having it towed home because his key was stuck and would'nt turn on. He said it was a pretty big job to fix it after the key got stuck. That cylinder is pretty pricy though (~100$) - get the one that matches your VIN.

Best of luck to you.
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  #23  
Old 07-26-2006, 02:11 AM
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Thanks for the advice Peragro, I'll invest in the lock cylinder, and use the VIN, and do them both at the same time...sometime. Maybe I can limp along until October and learn from your experience. Better ye then me eh? Thanks and good luck man.
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  #24  
Old 07-26-2006, 06:42 AM
Craig
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FWIW, my 300D had the same problem (need to more the key around to get the ACC to work). I had it in the shop and asked them, they told me it only needed the electrical portion of the switch (less than $30):

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ41UX0C3OFD&year=1982&make=MB&model=300-DT-001&category=All&part=Ignition+Switch
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  #25  
Old 07-26-2006, 05:03 PM
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Quote:
Originally Posted by Craig
FWIW, my 300D had the same problem (need to more the key around to get the ACC to work). I had it in the shop and asked them, they told me it only needed the electrical portion of the switch (less than $30):

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ41UX0C3OFD&year=1982&make=MB&model=300-DT-001&category=All&part=Ignition+Switch
Yep, the electrical switch doesn't seem to be too expensive. Rumor has it that it's a lot of work to change out. Conversly, the key tumbler is pricey but relativly easy to change out.

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