Gentlemen,
I have been tweaking on some of the little nuisance issues my '01 seems to develop every time I read new thread about other owners developing the same nuisance issues. Almost like it's foretold problem I will soon have the pleasure of experiencing.

My recent conquests;
Hankook Non-RFs
4 wheel alignment
XM radio
Shifter Light (A4)
4 way flasher
rebuilt headlamp door motor (1 done-1 in a box on deck)
adjust rag top to clear door glass
Clay bar, wax and buff (looks fricken brand new!!)
EBCM Module rebuild (Thanks David Ruberg)

I had been advised to take care of the EBCM issue before I dove into the Cruise Control issue as the one might be related to the other. I now have the EBCM issue resolved. It's awesome, not real sure why I waited as long as I did.
The one thing I did different that I have not read about yet, was to put a wrap of masking tape on the mounting screws to the driver tip. Start the screw a few turns and then pull the driver back and remove the tape from the driver. The screws went in one right after the other with no problems at all. 10-15 minutes tops to reinstall the module.

Now that all the stars are aligned and every electrical gremlin I had to this point has been dealt with. I still do not have cruise control.

Once again I would love to tap into this vast wealth of knowledge.
Obviously I started with replacing the fuse, no such luck. I am wanting to hose down the multi-switch with some de-ox electrical cleaner we use on mixing sound boards.

Is there a documented historic issue with the cruise control that keeps it from working.

Once again... Thank you.

I couldn't imagine figuring this all out without this forum.

 

fuse ?? or brake pedal switch ??

 

You should pull your codes on the DIC. That will give you a place to start looking. Could a number of things. From the wheel speed sensors to the SWPS for just a start. With out the codes it would be just a guess.

 

You never said exactly what your "problem" was with cruise control. Hard to help without knowing what is or is not happening.

 

Sorry,
I have nothing. No codes. I rebuilt the EBCM module cleared all the old codes and I have absoulty no codes what so ever.
When diving I flip the switch on bring it up to speed and push the button. Nothing.
Im going to check the switches under the panel later today and see if that does it. Just found out about that quick fix this morning.

Other than that I got nothing.

 

Checked the switches under the dash on the brake pedal assembly..... nothing.. Still no cruise.
checked again on the DIC "NO CODES'

I'm open for ideas.

With limited electrical testing equipment where is a good place to start.


Thanks

 

Got me stumped on this one. Maybe Bill Curlee will pipe in.

 

I'm wondering if my Multi-switch went south.
Hopefully after Thanksgiving I can take it home and have our family mechanic take a crack at it. I don't have electrical testing equipment of that nature. I have a voltmeter a test light, and a modest collection of hand tools. Everything else is home in the shop.

Now if you want to build a multi story .. I got that stuff..

 

Did the cruise control work correctly before you did the EBCM work?

I looked at the FSM, there are several potential causes including the Multifunction switch. I don't think it is the TAC module since you don't have any codes. The Multifunction switch can be tested without removing it, similar to the brake pedal switch circuit for cruise. Unless your technician has a FSM I don't think he will be in a position to really find your issue easily. It is too much to try and discuss in a post but I can post schematics. If you want to discuss you can PM me with your phone number and I can help you understand.

I can also post the affect switch connector pin outs for in-situ continuity testing of the above switches.

 

I purchased the car with the EBCM problem in So MO. 15 miles from the absfixer gentleman. Was talking to him on the phone in the parking lot of the dealership running the codes on the DIC. He too, without seeing the vehicle, reccommended to take care of the EBCM issue first as this can sometimes effect the abs and the cruise. This sounded logical to me at the time. Plus it was worth $1000 off the asking price, and I got em down another few bucks for the unknown cruise issue. But thats a whole differant story
Went through all the things that could cause it to not work, but as I said I'm stone knives and wood sticks here.

As of last night when I parked it
Switches under the dash are pushed up against the brake pedal arms as they should be
Another newly purchased fuse in slot
No codes on the DIC
Its almost as if its not getting power but that is a guess. The other funcntions work

Thanks again

 

If the brake lights work then that switch should not be the problem. The closing of those contacts disengages cruise via the TAC. Could be wiring from the switch to the TAC but more likely the Multifunction switch.

 

There are more than one Cruise Control switch if you have a MN6/12 trans. The Brake Pedal assy has TWO switches. One for the brake lights and one for the Trans/Cruise control functions.

If your car has a manual trans, there is also a switch on that clutch pedal assembly. The switch MUST be depressed enough to CLOSE the contacts in the switch,

Use your foot and pull UP on the pedal/s and see if you can operate the cruise control function.

I installed a TICK Clutch Master cylinder in my ZO6 and got a CEL. I did not recognize the DTC... When I looked it up, "P-0571"
I realized that I had to readjust that switch.

If you have an A4, you only have to deal with the BRAKE Switch on the brake bracket It’s a simple 2 wire switch and you can easily check it with an ohm meter to make sure that the switch contacts are making and breaking when you push and release the pedal,

 

Gentlemen,
I have a 2001, A4. I located the switches on the brake pedal assembly. As far as I can tell they both function correctly. whether they work or not is still in question. I do have brake lights.
I've checked what I have been told to check. The latest was to drive down the highway, hook my toe under the brake pedal and pull up slightly. While doing this, turn on the cruise and activate the button..... Still nothing.
I'm thinking Multi- function switch, but we'll see.

Though as I was cruising along tonight getting supper, laundry done and everything ready to go home tomorrow. Thoroughly enjoying my drive down I-135 doin every bit of the KS 75 mph, car is purring, thinking to myself "if it wasn't for the cruise control, everything in this old car works just fine" Life is good....... Then I look down at the gauges and the oil pressure is buried. Really???

 

Thanks to Bill, I had overlooked the TCC circuit. The switch for that is also part of the brake petal assembly. The circuit is actually in the transmission section. It is connector C1 with (Pink wire) power coming in via pin B and output thru pin A (Purple wire). This switch opens when the brake pedal is depressed. The circuit is powered from Fuse 19 under the hood. Here is what the connector looks like:



Like I said before if the brake lights work then the main brake switch which feeds the TAC should be good. Hopefully all the wiring and connections are ok. Hope the oil pressure issue is just sender related.

 

I havent checked #19 under the hood. I will today before I take off on my 3-1/2 hour commute. Cruise would be nice
Thanks!!
The oil pressure Issue is the same one that has plagued the rest of the C-5 community. I have oil pressure with the engine off. Anyone in the Salina/Witchita area want a small project. I can hook you up. That one is completely outside my availible DIY resources

Other than wanting one since I was a gear head teenager I bought this car so I would have something to do. Occupy some of my free time while I travel. I guess I got what I wished for huh?

 

Nice talking to you on the phone Don. Removal of the brake switch assembly which has the TCC switch just requires access and removing the 3 connectors. The FSM does say exactly how to physically remove it so it must be self explanatory. Here is what it says about installation and adjustment. Good luck, Mr. Sam