Help requied in diagnosing PDC fault code
 

I've had numerous issues with PDC in my A8.
I've replaced all front and all rear sensors, front ones still don't seem to work but they stopped throwing codes, i think maybe the speaker for the front ones may have gone?

With the rear ones I'm getting one code:

01549 Supply Voltage for Parking-Aid Sensor 29-00 Short To ground.

Could this be a wiring fault or maybe the PDC module in boot can be faulty?

This may help: http://wiki.ross-tech.com/wiki/index.php/01549

I don't know which measuring block to look at but you can usually cycle through them quite quickly.

Hmmm, ill be trying this next:

"One faulty sensor can cause this DTC and drop the Sensor Voltage Supply MVB reading. Unplugging the front -or- rear wiring harness to eliminate 4 sensors at a time is advised during the diagnosis. Make sure to cycle the ignition off and back on before evaluating the MVBs. After the front -or- rear of the vehicle are determined to be problematic it is recommended to unplug the senors one at a time to see which one crashes the Sensor Voltage Supply MVB reading."

thanks!

Logical, Captain.

It's raining outside so I can't have a look at the moment but I've had another thought:

When I drive with the handbrake on, i get no beeps, just the light onthe dash show up, would the speaker responsibile for the hand brake beeping be the same as for the front sensors? I know there are 2 speakers 1 in rear for the rear and 1 in front for the front, if thats blown, it would be showing as short to ground and would explain the error.

Does the handbrake light trigger a beep, not on my car? :Confused:

As far as I'm aware the handbrake warning light is a totally dumb circuit. I've even driven significant distances with it (partially) on...…. :o

So IMHO the handbrake isn't going to help diagnose the fault.

I did look into the handbrake warning circuit ages ago when mine broke but don't recall the details of what I found. Replaced my mechanical switch with a magnetic reed switch as used in door sensors of domestic alarms.

There is no handbrake beep. Only Zuul.

OK, so with one of the plugs unplugged as in attached pic, I'm getting:
01543 Parking Aid Warning Chime h15
01625 - front parking aid warning chume h22

I can't tell whether the plug I took out is for front or back, but if i remove the other one and plug in the one i took out, vcds can't communicate with the module.

I've also read the measuring blocks for front and rear sensors and they all seem fine?

I will order a new buzzer from Prestige and go from there unless someone has a better idea?

Does anyone know if the buzzer is located behind the cluster on a RHD or somewhere behind the front passenger air bag?

This means the plugs on the bumpers, not on the module itself. Both are on the left side clipped to the bumper bar, rear is above the tailpipe, front is under the headlight. Headlight lower trim off and bumper bolts out and you can pull the bumper forward enough to disconnect it.

Ahhh so I've had it all wrong completley haha. thanks!