[Roboman]

Hi all, has anyone retrofit CC? I have the necessary hardware, previously working on my 944S2, and the appropriate 968 accelerator cable. I want to lay the loom over the original system as my car is very original and I don't wish to downgrade it. I'll need to tap into power and find the speedo pulse output, other than that the CC is a stand-alone item.

Any tips would be welcome.

Thanks

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[Waylander]

Think you might find the loom is already there,


Two plugs by the side of the central electric fuse box, and connectors over by the battery but in the engine bay


Almost all USA cars have the loom

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[Roboman]

Thanks Waylander, I have been trying to get such info. I even contacted Porsche Stuttgart who were not as helpful as they could have been (btw, my 968 was direct import to the Middle East, so who knows what the specs are?). I sent my VIN to Stuttgart but that didn't seem to lead them anywhere.

I've not given the loom a thorough inspection yet but should get to it in the non too distant future. I did look at a plug/socket arrangement I found near the brake booster (LHD) but the CC brain is socket socket, so that can't be right. I'm yet to examine behind the carpets.

I know you have an interest in this, so I'll post what I find.

Cheers

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[Waylander]

The mounting point for the cruise computer is up above the hood pull and sort of beside the fuse box, should be a round plug near the RH strut tower if you have the engine bay trims it might be hidden under there, only one connection in the engine bay for the motor


Think if you have the rest then two plugs by the pedals one for the clutch and one for the brake, the only part that you might have to make is the connector lead from the column switch to the main loom

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[Roboman]

Thanks again, I'll try to get to this within the week and shall let you know ... no promises, Winter approaches and other jobs are drifting up in priority.

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[Roboman]

   

 

Waylander, as promised in my intro. theme, here's the cable from the local general Auto-shop (Hayne's equivalent) ... correct colours for CC loom but heavier gauge.  No time yet for further investigation on this topic. Cheers

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[Waylander]

that's a fat cable, might have a bit of fun getting that inside the car

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[Roboman]

Having just fixed my footwell switch for the boot release, I was in under where the cruise loom should go. No sign of any plugs so decided to examine under the bonnet near the firewall/ heater blowers; no plugs there either, so I guess I'll have to make the wiring myself. I usually advocate for "if it ain't broke don't fix it", but in this case, seeing as all the bits are in a bag in my garage I may do some basic cleaning and " refresh soldering" before I start the installation.....and checking if that cable will fit through the grommet in the firewall!


Still can't fathom why I have a clutch release socket wire??


Also not sure why Porsche would design the brake lights to stop the CC functioning....I guess I'll examine that one later.

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[dsmblue]

Having just fixed my footwell switch for the boot release, I was in under where the cruise loom should go. No sign of any plugs so decided to examine under the bonnet near the firewall/ heater blowers; no plugs there either, so I guess I'll have to make the wiring myself. I usually advocate for "if it ain't broke don't fix it", but in this case, seeing as all the bits are in a bag in my garage I may do some basic cleaning and " refresh soldering" before I start the installation.....and checking if that cable will fit through the grommet in the firewall!


Still can't fathom why I have a clutch release socket wire??


Also not sure why Porsche would design the brake lights to stop the CC functioning....I guess I'll examine that one later.

So that if you are coming up on another car or other situation that requires the brakes, it disengages the throttle.  Same thing happens with pushing in the clutch, with the difference there being that when you release the clutch, it will automatically resume prior speed.

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[Roboman]

So that if you are coming up on another car or other situation that requires the brakes, it disengages the throttle.  Same thing happens with pushing in the clutch, with the difference there being that when you release the clutch, it will automatically resume prior speed.

Sorry dsm I wasn't clear .... according to quite a few people, if any of your brake lights are out then the CC doesn't work. I don't know how that would function unless there's a current sensor in the CC brain, why would Porsche do that, and how would CC cater for the addition of a third brake light?


Anyway, I'll hopefully get mine up and running, and then remove a brake light to see if the CC malfunctions.


Cheers

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[Waylander]

So that if you are coming up on another car or other situation that requires the brakes, it disengages the throttle.  Same thing happens with pushing in the clutch, with the difference there being that when you release the clutch, it will automatically resume prior speed.

That is not true, the only time cruse should resume automatically is after accelerating with you right foot above what the cruise is set at, when you take your foot off the car should just slow down to the set speed

 

the reason I say this is, if you set the cruise at 50mph in 5th the dip the clutch to change to 6th, the speed is controlled by throttle position by changing gear your speed compared to throttle position and gear ratio will have changed

 

this has been the same in the last 6 cars I have owned with cruise

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[Roboman]

Sorry Waylander, but my 944S2 did suspend CC when the clutch was depressed and resumed at the same speed once the clutch was released. The 944/968 use a signal take-off from the instrument cluster /speedo, as opposed to maybe the "e-gas" throttle position used by some newer vehicles.

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[Roboman]

Okay, well I've looked at pretty much all the CC articles on this site as well as a few random ones on the web...... wish me luck!

 

 

   

 

 

If anyone has a shot of the CC wire and accelerator cable going through the bulkhead near the brake booster (LHD) I'd be grateful - thanks!

 

 

On further investigation there's a grommet right beside where the accel cable goes thro' so that one is pretty clear. CC wire anyone??

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[Roboman]

HELP needed .....

 

So far so good .... I have located part of the cruise loom, and importantly what would have been the more difficult part; the plug that carries the switch and speedo signals to the CC.  I knew there was no point in a clutch switch with no cruise. The "signal" socket was right at the top of the foot-well behind a plastic baffle the holds fuses 42-46 and the alarm horn. Also located the socket for the column switch, and attached the clutch switch .... all tested out okay.

 

The actuator/servo seems to function, but I need to fashion a 3rd anchor point as it is different to the 944 from which my CC was lifted.

 

It definitely helps removing the steering wheel, my old body now struggles with being upside-down in the foot-well!

 

The speedo cruise cable must go thro' the firewall beside the pedal cable, so that's just a matter of doing it though I doubt it will be straightforward.

 

That just leaves the brain to actuator wiring; I have searched and searched for either end with no success.  Making up the loom is straightforward as it is just 7 wires point-to-point and I have the appropriate plug/socket, no tapping in from elsewhere etc.  However ..... HELP HELP ..... can somebody please let me know how this cable gets from the foot well to the engine bay.  Is it through the firewall (I cannot find a spare grommet cf the one for the accelerator cable), or is it via some of the holes in the side of the engine bay where typically the hood/bonnet release cable travels?  I can find nothing on the web to show me.

 

A photo or description would be appreciated.  Thanks,  Robert

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[Waylander]

i am sure its wrapped in the main loom in cars with it already fitted

 

I can check to see if the is 2 different part numbers for the engine bay loom

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[Roboman]

Thanks Waylander, knew I could rely on a response from you.  I hope it is there, but if it is then it is well hidden!!

 

Surely the wires wouldn't be in there without the plug/socket?

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[Waylander]

If it’s like my car then no wires at all, but don’t know about under the dash if I can get some upside down time I will let you know

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[Roboman]

If it’s like my car then no wires at all, but don’t know about under the dash if I can get some upside down time I will let you know

Thanks.  That's enough for today.  Forgot to have dinner!

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[Waylander]

having not had a lot of time today,

 

there are 3 different looms for the engine bay, but they do not state if cruise is included or not

 

but you did mention that the brackets are wrong for the motor, now here's some good news, they are available from Porsche at not stupid money, 

 

that main motor bracket is £6.71 inc tax

 

944 617 125 01

 

there are two different clutch pedal switches, one RHD one LHD

 

here's a picture, tell me what you need and i will tell you if its available

 

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[Roboman]

Thanks Waylander, it's okay all the hardware is in place, but I may buy item 17 at some point as I had to take to the 944 mounting with an angle grinder and a lump hammer, (the long bracket, item 16, fitted just fine).

 

If nothing else I realised how slack my throttle cable was, so adjusted that and the servo cable at the same time.

 

Spent most of today upside down in one foot-well or the other, attaching the servo cable and/or searching for the elusive loom/sockets/ or a way through the fire-wall.

 

Couldn't spot either plug/socket for the loom so eventually gave up and searched for a way through for my cable.  Again nothing obvious, no spare grommets and those that I poked at were full.  Eventually found a grommet with plenty of space around it which feeds the heater blowers; located above the clutch pedal (LHD).

 

So that's where I'm at now, about to solder the two ends, switch it on and see if it smokes!!

 

I won't test drive tonight, too tired, the steering wheel is off, and I fancy a sit down (or is that up??) and a glass of wine.  So we'll see what tomorrow brings.  Given the volume of negative comments about 968 and 944 cruise control I'm prepared for disappointment, but no worries, that just means more hurdles until it works.

 

Again, thanks for your support.  Cheers, Robert

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