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Parking Sensor Error Codes - 04 CS - Help

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I have an 04 Cayenne S which broken parking sensors.

Its shows only only the 2 red lights at the left and right and nothing in between. It has been like this for about 2 weeks.

I've had this issue before after a 16 hour drive (8hrs each way), but the problem came right again.

This time, same thing, 16 hour drive, and it's broken, except this time it hasn't come right.


The sensors look ok and not damaged, not physically anyway. Have washed the car just in case of bugs / debris, but not helped.

Have checked the fuse and it's fine.


I've looked at the DTC codes and here's what I got

DTC Count: 13
01549 Supply Voltage for Parking-Aid Sensor
       Status : Sporadic error
    lower limit exceeded
01629 Sensor for Parking-Aid; Front Left (G255)
       Status : Permanent error
    cut in, short to ground
.... and 11 more "Status : Permanent error cut in, short to ground" ... presumably it's from each of the 12 sensors.
From what I've read, this could be either the controller, damaged sensors, or broken wires. Since all the sensors are giving short to ground error, I'm going to assume it's not the sensors. So this leaves the controller or the wires.
The wires I assume is underneath the bumpers, which means I'll have to take the bumpers off.
But where exactly is the controller?
My idea is to check the controller first, and if that's a no go to check the wiring. Am I doing it right or am I totally on the wrong track?
Anyone have experience with this? Or can give any advice?
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