Recognise this connector anyone?

[Hodgey]

Hello Pelicans.
I found this connector 'dangling' down underneath my dash in my 87 Coupe.
The only thing that does not operate at the moment is the cruise control, which I have not begun troubleshooting as yet (I have the Bentley and have been reading but that's for another day).
I was wondering if anyone recognises it?
BTW, I did a google search for the item number and it didn't come up with anything other than a reference to a Mercedes spare part.

The wire colours are Red/White, Brown, Blue/White and Blue





I also would like to know when the Fresh Air Blower is supposed to work i.e. what has to be on for it to operate? Is it supposed to operate on it's own with the lever on the heater control panel or is something else needed to be on for it to run?? I wonder if this connector and the fresh air fan are related???


Thanks in advance for any assistance

Neil

[HunterVonWurst]

Can't help much, but a year-specific wiring diagram will help you figure it out in short order.

[twistoffat]

I think its off the air conditioning. Did you have one originally and it was later removed?

[86 911 Targa]

Here you go.

Good luck,

Gerry

[Hodgey]

Originally Posted by 86 911 Targa

Here you go.

Good luck,

Gerry

twistoffat; I have factory AC still and it works perfectly, although the PO did have additional vents added and then removed.

Gerry,
Many thanks for your help; I too had found it in my Bentley Manual and have spent several hours trying to determine where it should be connected, and I can see nowhere under the dash at all. What and where is the "Inside Temperature Sensor/Blower' do you know?

I still cannot understand where it should hook up to....I have had the heater/ventilation control unit off and understand how the fresh air fan lever works (blower operating switch, top one on the left in the diagram).

I have continuity there, and I also have voltage at terminal 1 (on the connector that I am trying to find out where to connect it to) with ignition on, engine not running.

My fresh air blower is not working when I move the lever to 1, 2 or 3 position. The lamp illuminates but the blower does not operate- unless I have to have something else running at the same time??? Any pointers? I want to eliminate all the silly stuff before I go ahead and dive into the blower fan.

[Hodgey]

Gerry,
We're getting close!! The connector I am looking at is dangling immediately to the right of the console at the same height that the hazard warning button is situated but to the right of it.

I will take a look this week at what you point out: what is it and what does it do if you'll pardon my ignorance??


Neil

[Rot 911]

86 Targa has it, plug for the AC blower resistor. Remove the passenger side wood floor board and you will see where it goes.

[dw1]

I had the same question awhile back.

Help identifying under-dash connector

My heater & A/C work fine (well... as good as any other black/black '87 with a stock HVAC system).

As far as I could tell after quite a bit of research, it is most likely that it has something to do with an option my car doesn't have - cruise control, perhaps, or the automatic temperature control (mine has just the 3-position rotary switch on the center console).

It isn't long enough to reach to the passenger footwell, so it is doubtful that it is associated with the resistor or blower motor.

[Cattler]

I found the same connector in the dash of my 87 cab. I found the other end while checking under the driver's seat to see what chip I have (hopefully in advance of a SW upgrade!). You might want to check under your seat as well. It was in between the car's brain and the inboard seat rail--cant remove it without some surgery as its under the center carpet and console.

[javadog]

Neil,

On your car, between the steering column and the ventilation controls, there is a small round grille with two slots in it. This is the intake for the interior temperature sensor. There is a sensor and a small fan behind this grille, tucked under the back side of the lower dash. The fan pulls air past the sensor, which then gives the interior temperature reading to the heater control unit. That's where you'll find a home for this connector.

It has nothing to do with the cruise control, or the A/C blower resistor.

JR

[86 911 Targa]

Originally Posted by Hodgey

Gerry,
We're getting close!! The connector I am looking at is dangling immediately to the right of the console at the same height that the hazard warning button is situated but to the right of it.

I will take a look this week at what you point out: what is it and what does it do if you'll pardon my ignorance??


Neil

Javadog is correct.

Gerry

[Hodgey]

Javadog.....I understand and thought that this might be the case: my car does not have the interior temp sensor as you describe, and I wondered if it were related to this? It probably is and I should leave it be because in the Bentley drawing (posted above) it shows the sensor no longer used next to it which makes up the resistor part of the system.

I have the same set up that DW1 has- the 3 position switch in between the seats. My car is 86/87 and it looks like it has some upgrades (G50) and not others (auto temperature control)

I really appreciate everyone's help in trying to solve this.

I think the issue I now have is the fresh air blower fan does not work when I move the blower operating switch/lever in the control console (top right lever which should operate the fan). The fan light illuminates, I have power and continuity of all 3 speeds but there is no fan noise......oh well...into the trunk we delve!!!!!

Is it possible to get at the fresh air blower wiring from the smugglers box or do I need to remove all of the ductwork and go from that angle?

[javadog]

I don't know much about the manual heater blower system, so I can't say with certainty whether your car should have the interior temperature sensor, or not. All of my cars have the auto heat controller.

The fresh air fan blower wiring has nothing to do with the smuggler's box. From the back side of the dash control lever assembly, the wiring harness leads to a bulkhead plug below the dash. On the trunk side of this bulkhead, another wiring harness continues from this plug to the fan housing, which is behind the black removeable cover at the rear of the trunk.

It's a fair amount of work to get to the actual fan motor.

JR

[86 911 Targa]

Originally Posted by 86 911 Targa

You may want to find the harness connections as per this jpeg which is part of my factory manual.

Turn on the fresh air blower, and check for voltages at these connectors.

Maybe we are looking for an open ground.

pm me.

Good luck,

Gerry

Also, this is the temp sensor that javadog is referring to.

[Hodgey]

86 911---------I do not have the sensor in the dash.
I will be checking the voltages at the ;lug under the dash after my dinner this evening....


I will report back!!!!!!!

Neil

[Mark McClure]

My guess is the interior sensor as well. I had to replace my wiring so do not have the plug for comparison. If you have the auto heater and a targa them more then likely that is what it is. From your picture it does not seam long enough to reach anywhere else.

If you do not have the sensor ( small motor with a heat resistor at the end ) then maybe it is the standard wiring loom just left unused.

Mark.....

[Hodgey]

Mark
Many thanks to you and all the others for your input.

I now believe I have a motor fault as I can operate the lever and get continuity at 3 of the 4 connections into the fresh air blower from the controls (2,3 and 4 in 86 911 Tara /Gerry's cut sheet) when I select position 1,2 or 3 on the blower operating switch telling me I have no wiring fault to the fresh air blower.

I have continuity between 2 3 and 4 posts on the motor itself, which is leading me to think I have an issue with the motor.

One last question, is it safe to try and put battery voltage straight to the motor post (position 1 on the Fresh Air Blower) and couple 4 to ground (to complete the circuit) to prove that it is dead as if it is faulty it will not run?


Thanks in advance

Neil

[86 911 Targa]

Originally Posted by Hodgey

Mark
Many thanks to you and all the others for your input.

I now believe I have a motor fault as I can operate the lever and get continuity at 3 of the 4 connections into the fresh air blower from the controls (2,3 and 4 in 86 911 Tara /Gerry's cut sheet) when I select position 1,2 or 3 on the blower operating switch telling me I have no wiring fault to the fresh air blower.

I have continuity between 2 3 and 4 posts on the motor itself, which is leading me to think I have an issue with the motor.

One last question, is it safe to try and put battery voltage straight to the motor post (position 1 on the Fresh Air Blower) and couple 4 to ground (to complete the circuit) to prove that it is dead as if it is faulty it will not run?


Thanks in advance

Neil

Neil,

If you have continuity at the motor winding 1 & 4, and the motor does not run,
the motor may be seized,

If so, there may be a fix, but the blower motor must be removed.

Try the 12V @ #1(Red/White) and Ground @ #4 (White), if the fuse blows,
that indicates possible motor seizure.

I did notice that your "mystery" connector wire color code does not
match up to our '86 schematic.

pm me if needed.

Good luck,

Gerry

[Hodgey]

Gerry
It does match the drawing: the 'mystery connector is there, it just ain't in my vehicle to couple it up to!!

I will try the direct wire and see what happens: I guess I could strip out the motor and see if I can get it to free up......I wonder if it would be worth reconditioning it as I have a very good motor shop nearby that my plant uses.


By the way, what's the gizmo opposite the #2 & #3 connector? is it part of the motor wiring inside the housing? What does it do?

Thanks again

Neil