Klima > Ice Cube - Not Working - PeachParts Mercedes-Benz Forum

BrierS · #1 08-24-2004, 08:48 AM

Arthur
Tried unpluging connectors at S25/5 (#12 at Klima socket) & S27/1 (4 at Klima) then grounded S31 (#10 at Klima) with no compressor engagement. All of these were done with the Klima plugged in and the connections interrupted at the individual switches.

Arthur Dalton · #2 08-24-2004, 10:40 AM

OK
That test was to test the relay circuit and acc panel to seek ground..
Unplugging both the temp and throttle sw eliminates them [ they ground to stop comp]
Grounding 10 at relay eliminates the comp pressure circuit/panel
When you jumper 5 to 7 , you are bypassing the relay circuit..[simply jumping the load contacks of the relay]
So, you are down to relay /modual input fault

You have the schematic there ?
I am not sure if I am on the right one ....

BrierS · #3 08-24-2004, 11:41 AM

Arthur
Just got Adelphia Powerlink back . . . read your message and was getting itchy since I couldn't let you know I have the schematic.
Steve

Arthur Dalton · #4 08-24-2004, 11:51 AM

Quote:

Originally Posted by BrierS

Arthur
Just got Adelphia Powerlink back . . . read your message and was getting itchy since I couldn't let you know I have the schematic.
Steve

Me too
I was trying to trade some stocks and lost mine [ powerlink] too
Anyway, which schematic should I be looking at ??

BrierS · #5 08-24-2004, 11:52 AM

Just so you don't have to make assumptions, my car is an '87 300TD so that is Model 124.193 with the 603.960 engine. My schematic is from the MB Service Manual - Automatic Climate Control Model 124. Though I haven't checked, I believe it is the same on the CD volume.

I went through the testing procedures for all of the Klima connections listed in the manual. Everything passed which led to the Klima (according to the manual). Since I wired the Ice-Cube according to this forum I thought it would replace the Klima and work okay. Not so.

Hope this helps show where I have been so far. I am really stumped at this point.

Thanks a bunch for taking the time to look this over for me.

Steve

Arthur Dalton · #6 08-24-2004, 01:14 PM

Quote:

Originally Posted by BrierS

Arthur
Tried unpluging connectors at S25/5 (#12 at Klima socket) & S27/1 (4 at Klima) then grounded S31 (#10 at Klima) with no compressor engagement. All of these were done with the Klima plugged in and the connections interrupted at the individual switches.

I see no s25/5 , but s25/11 feed from 12.

There is an idle rpm ,min 600rpm, with a 10 sec delay input at pin2.
Do you show that?????????/

BrierS · #7 08-24-2004, 01:49 PM

Quote:

Originally Posted by Arthur Dalton

I see no s25/5 , but s25/11 feed from 12.

There is an idle rpm ,min 600rpm, with a 10 sec delay input at pin2.
Do you show that?????????/

Okay. S25/11 & S25/5 as well as S25/3 are quasi same function just different engines and/or years.

My pin #2 goes to X29/4 (1-pole test coupling) and then to N8 (Control Unit - Idle Speed Control). This N8 has the K1 overvoltage relay, L3 Starter Ring Gear RPM Sensor, and two ELR related devices connected to it. Not certain how the Idle Speed Control Unit works into the overall scheme of things. Actually, I haven't even located it in my vehicle yet.

Arthur Dalton · #8 08-24-2004, 01:56 PM

I am not familiar with that RPM circuit .
My schematic says it was phased in from 87-88..
SB prolly knows more on that [ or MBDOC]

I am assuming you do have the car running when checking the other switch disconnect test...

BrierS · #9 08-24-2004, 02:04 PM

Yes on the running while performing the tests.

The one thing that keeps making me wonder is that where most people use the Ice-Cube Relay to bypass the Klima and solve their ACC problems, mine won't engage the compressor when it is installed. That has to be some type of indicator.

Arthur Dalton · #10 08-24-2004, 02:14 PM

So ,
where exactly does the ice cube line up with the pin3s and which are primary [ coil] and which are contacts [ load ] on ice?

BrierS · #11 08-24-2004, 03:38 PM

Quote:

Originally Posted by Arthur Dalton

So ,
where exactly does the ice cube line up with the pin3s and which are primary [ coil] and which are contacts [ load ] on ice?

Pin #3 on the Klima socket is not used by the Ice-Cube relay. The only Klima socket pins used are 1, 5, 7, & 10. Actually, pin #3 on the socket does not have a female receiver but rather a blank hole. That seems strange to me since the Klima has a pin at #3. So the complete line-up is 1 > 85, 5 > 86, 7 > 87 & 10 > 86. That's all the "recipe" calls for when doing the conversion.