Electrical problem puzzlers

[mdhhorn 0]

Hello everyone!  I’ve run into some electrical problems on my '08 Turbo and I’m stumped....  I've looked through a lot of Renntech posts and don't see any thing close. 

• First the panoramic roof and sunshade were opening and stopped about foot open.  Maybe coincidence, it happened right when someone opened the door.  I’ve checked practically every fuse even pulling the pano-roof control unit (back where the motors are located, and the circuit board looks okay.
• Then the instrument panel has started to act strange.  The gear indicator shows that it is all gears at once, see the photo which is while it is in drive and moving.  I can shut the car down and restart and the problem goes away.  The time keeps changing randomly and the outside temperature is wrong.
• The button that opens the rear hatch that’s on the driver door has stopped working.
• Then my battery died, it was five years old so no surprise.  After I replaced it the airbag indicator on the panel has lit up. 

I’ve tried to reset the instrument panel (Main Menu> Settings > Factory Reset) but it will not allow me to select “Reset”.  I’ve also pulled the fuse several times to reset the panel but no change.

Today, I’ve connected my iCarSoft POR II diagnostic tool to the car. 

• The Airbag section says it “cannot connect to the ECU” so I can not reset the airbag light.  There are YouTube videos of people using the tool on Cayenne’s (albeit on newer models) to reset it so I believe I can.
• The Panoramic roof says it does not have any DTC codes. 
• The lift gate button on the driver door indicates it has appropriate voltage and no DTC codes.
• Also, no DTC codes for instrument panel, electrical system or DME

I’m not sure this is related or not, I changed out the interior incandescent bulbs with LEDs.   I now know that LED bulbs give off electromagnetic interference but seems remote.  (as a side note, I found this out when I put LED bulbs on my garage door opener unit and it stopped receiving commands from the remotes – I had to get special bulbs from Amazon)  Yesterday, I removed all the LEDs and went back to the old bulbs – no change.

Any ideas, suggestions or guesses?

Thanks,

Mike

 

FYI: The car is in Drive, "D"  and is in motion. 

Edited October 3, 2019 by mdhhorn
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[Loren 2,166 2 Vehicles]

These cars (specifically Cayenne)  seem very sensitive to weak a battery and poor grounds.

Whenever I see multiple electrical issues on a Cayenne - that is where I start.

[mdhhorn 0]

If I have changed out the battery, how do I reset the electrical system?

Thanks.

[Loren 2,166 2 Vehicles]

You should not have to - unless you hooked up the new battery backwards.

If the polarity was hooked up correctly then you need to start looking for poor grounds. Starting with the battery cable then chassis grounds.

[mdhhorn 0]

Update

I updated the firmware on my iCarsoft and reran code check. Now I’m getting the following code on the panoramic:

— 0470 CAN comfort in single wire operation

 

also I’m getting the following error on the Gateway:

— 1336 CAN comfort OFF

would this info help in my search for the grounding problem?