roberta berks

Rear convenience module is not communicating.. (nothing is wet back there but water is under passenger foot well)so in process of looking over the rear right wheel first and there are 3 connectors not plugged to anything.Im assuming they are for options? dont see at this point where they could have disconnected ?assuming they are for options? dont see at this point where they could have disconnected ?

About to take a look at my wiring on both sides of vehicle under the carpet which is wet...any advice on pulling it out correctly to check wires on floor without damaging anything?thanks much

39 minutes ago, Loren said:

Does the car have a new (main) battery?

Yes new main..no rear battery

thanks.. any particular area to check first?

Car at dealer one hour they cant find problem yet..Attached is the printout so far..any help reading this to narrow down problem?before they rack up the hours is greatly appreciated! PCM not working or Ac/heat nor keys either..They say nothing is getting a signal..what could that be?car just sitting a couple years..Has new battery..

06 Cayenne S.. PCM not working along with the AC/Heat blower module below it not working either...is there a connection between the two that can solve the issue here by chance?fuses all good..Thanks Rob

Thank you kindly...

Blank PCM and ac/heat screen is blank too.. hope someones got some insight on something other than fuses (all good)or 148 reset ect. Ive removed PCM how can I check it or some module that it and the ac/heat below it,plugs into?

Im getting conflicting info.. some say there is a code for 2006 Cayenne S PCM some say there is not one.Mine doesn't work so I thought maybe I need  code after my Battery was replaced?I dont have my code but is it even required?

A/c and heat controls are blank and fuses are good..any ideas what else this could be? appreciate any help..

PCM seemed to stop working with old low voltage battery ..new battery 2 months ago and PCM and ac/heat blower controls under PCM dont work either just blank..no aux battery in trunk..Loren mentioned maybe some reprogramming needed..keys dont operate anything either with new batterys in keys..no kessy..

Makes sense being off the ground errors though..will post if any changes while driven on hard pavement.. thanks again for the great help!

2006 Cayenne Titanium S started losing voltage from not driving..replaced battery under seat...Car was sitting for 2 years...No aux battery in trunk.Car starts runs fine with new battery.. but..Car has blank PCM screen..radio is very muffled sounding and quiet,only can change radio from steering wheel not blank PCM..,cd player in PCM works but like radio very low sound..rear hatch does not open or click..ac /heat blower not working and its blank too..Key batterys were dead..replaced both battery's and does not work to lock unlock doors or hatch with new key battery's.. PSM light on too.(Its not in off mode).tried 148 code and the main and trip hold on PCM..checked all fuses and pulled and replaced all fuses,all 3 fuse areas getting above 12v with key turned on...Nada..45k miles almost mint Florida weather car..

Thinking about icarsoft scanner for Porsche...dont want to spend to much if this could work on scanning my problem..  any help is truly appreciated..

Update..after pb blastering rotors overnight took off the very tight calipers today..rotors stuck,wouldn't budge..took a pry bar and popped them off..e brake was turned all the way out in drum of rotor. clicked the adjustment pin all the way down to compress it..I could care less about ever using the ebrake so no adjustment clicks back ..washed and brake cleaned everything up..wheels spin now..Thank you Nurbek l..

thanks..car is extremely programmed to go to the stealer..

Update^^ No rear aux battery...

2006 cayenne titanium S.haven't checked under Bose in rear which is under the deflated spare tire for a second battery..Ive heard some say 2nd batt is an option for that year, as well as no because of Bose..In the interim can I hook up another 12v batt in parallel outside the car to check if some electrical gremlins go away(or am I going to add more gremlins to this hyper sensitive vehicle) even though my 2 month old battery is showing 12v plus?

Excellent information Nurbek 1..

Thank you for taking time to write this up..did try option A but had no idea about those pins in back..will update soon..

On 2/11/2019 at 12:24 PM, roberta berks said:

^Thank you for your great info...anyone have used a Durametric for sale? Now the PSM warning light stays on and service now warning is on, and rear wheels only wont move in drive or reverse...front wheels move..any help is truly appreciated..E brake seems ok..

Update^^ ebrake seems to be stuck in rotors,got rear hubs turning after prying on rotor and removing 50 torx bolt..

4 hours ago, Nurbek I said:

 

Yes, it is most likely e-brake if we apply the Occam's razor theory. Brake shoes or any related mechanism might be rusted and not releasing fully, if the car sat for long with the e-brake engaged.

 

If the car was working fine before, then there is a low chance of transmission not sending the power to the rear or psm err. I am pretty sure PSM works thru via calipers, so if the pads are not sticking, then that's not a problem.

 

The long way to verify that e-brake is the issue is to take off the rear calipers, then rear rotors. If the rear wheels move freely after that, then e-brake is the issue. 

 

If you don't want to take off the rotors or calipers, you can try engaging/disengaging the parking brake few times, hit the top hat of the rotors with rubber mallet, while trying to move the rotor by hand. You can actually feel if it's parking brake issue if you listen to around the back of the rotor while you try to move the rotor back n forth with hand. 

 

You can spray some brake cleaner to the inside of the rotor top hat thru the holes. You can stick a screwdriver through the 5mm hole and rotate the parking brake adjuster to release some tension. You can see this pelican diy article's last three pics to see what I mean. 

https://www.pelicanparts.com/techarticles/Porsche-Cayenne/19-BRAKES-Rear_Brake_Rotor_Replacement/19-BRAKES-Rear_Brake_Rotor_Replacement.htm

 

Hope that helps. Keep up updated.

 

 

Thanks helps a lot..well I believe its the e brake shoes holding on rotor..didn't remove caliper just pushed out pads..but cant take off 5mm triple bolt its stripped..took off the other t50 torx on rotor and now the rear drive shafts are spinning and rotor is staying put..Can I cut this e brake somewhere or pull it out of the rotor from the back to release it from rotor?(I know its not the right thing to do just temporarily)dont need it anyway..thanks much

Anyone have any product # for Vag tool for 2006 Cayenne S? I believe it works 90% of what durametric does I hear...thanks much

3 hours ago, Nurbek I said:

First of all, try disconnecting the battery to see if it changes anything. 

 

If you jack up the car and have all 4 wheels off the pavement(safely), do the rear wheels move by hand in neutral? 

Check the driveshaft, rear diff while you have the wheels off the ground.

 

Are the calipers stuck? Take off the calipers to see if the problem still there. 

Maybe parking brake cable not releasing at all. According to a parts diagram, parking brake shoes are inside the rear brake rotors. If the parking brake is ON, it's really hard to remove rear rotors. So if you already have the rear calipers off from the previous step, then try taking off the rear rotors and inspect the operation of parking brake.

 

GL

Thanks..What would you check on rear diff and driveshaft?they look good..car has 45k miles..

Thanks..battery disconnect no change..car is on stands front wheels turn in neutral, drive and reverse with car running ..rears do not move.. if tranny is moving the front wheels and shifting correctly does this isolate e brake only?wiggled and pulled on e brake at rotors no change..moved brake pads off rotors no change..would any sensor,electrical or psm problem cause a rear wheel lock up like this?car sat for many months but drove fine has new battery..

^Thank you for your great info...anyone have used a Durametric for sale? Now the PSM warning light stays on and service now warning is on, and rear wheels only wont move in drive or reverse...front wheels move..any help is truly appreciated..E brake seems ok..

On 2/1/2019 at 9:22 PM, Loren said:

Well, that should not happen - changing the car battery should not affect the keys.

Do the keys have good batteries?

If all is okay then somehow the central locking and alarm module got confused and may need to be re-programmed.

Any idea how a DIYer can reprogram  the central locking and alarm module ?

Car feels like the emergency brake is on but its not.Shifts into drive and reverse but will not move rear wheels.Front wheels do move both in drive and reverse...PSM warning light on pressing PSM button does not turn it off.. Sometimes feel a loud grinding pull and car moves a couple inches when trying to drive it...anything besides e-brake that could lock up rear wheels only?Any help appreciated!