powderlvr

Hello everyone,

My 2006 A8 L's parking sensors have acted up again. I had the system working nicely after replacing some faulty ones but my parking bliss was brief. I've searched the net for these errors but found few hits outside a forum in Poland. According to Google's translation of the page I need to "remove the bacon". While I have no working parking sensors, I sadly have no bacon either, so that cannot be it. Note: When I put the car in reverse and listen, none of the sensors are currently clicking.

Here are the codes and any ideas outside of "take it to the dealer" will be investigated thoroughly and much appreciated:

Saturday,26,October,2013,12:32:16:04775
VCDS Version: Release 12.12.0 (x64)

Address 76: Park Assist Labels: 4E0-910-283.lbl
Control Module Part Number: 4E0 910 283 C HW: 4E0 919 283 C
Component and/or Version: Parkhilfe 8-Kan H12 0020
Software Coding: 0201308
Work Shop Code: WSC 02313 785 00200
VCID: 23450E62E2C75F06A91-8076
2 Faults Found:

01549 - Supply Voltage for Parking-Aid Sensor
009 - Open or Short to Ground
Freeze Frame:
Fault Status: 01101001
Fault Priority: 3
Fault Frequency: 1
Reset counter: 91
Mileage: 224328 km
Time Indication: 0
Date: 2013.10.27
Time: 11:27:02

01549 - Supply Voltage for Parking-Aid Sensor
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 01100010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 91
Mileage: 224328 km
Time Indication: 0
Date: 2013.10.27
Time: 11:27:02

ltooz_a6_a8_q7

None of the sensors work? Did you try the parking with/without the graphics interface? With graphics interface, you may find out which parking sensors not giving any signals. It could be the 4eo 919 283c is faulty? Disconnect it to see if the parking sensors beep?

Cheers,

Louis

snapdragon

What is your symptom? Error beep and parking aid comes up and disappears in a fraction of a second?
http://wiki.ross-tech.com/wiki/index.php/01549

powderlvr

Yes, the symptom is an error beep and the parking aid comes up and vanishes before I can even see it. And no sensors are clicking.

I read the Ross-tech wiki page and it isn't really helpful in diagnosing the problem.

If it's a wiring issue how can I tell whether the wiring issue might be the front or rear?

When I check the measuring blocks with VCDS all sensors show a distance of 255 mm.

There is only one measuring block for voltage and it shows 1.x volts. Intuitively that seems low.

Does anyone have a pin diagram for the parking assist control unit? I could measure resistance between all the pins on the plugs and ground to possibly figure out where a short might be.

-JT

Mister Bally

Blown fuse powerin the module or wire break/corroded connector pins between the module & Harness. Or a defective module but that is unlikely.

powderlvr

Hello everyone,

I've checked the fuses; they are OK. The parking sensors themselves are all good. How should I go about diagnosing this fault? Is there any way to tell whether the problem is with the front or the back sensor system? What should the voltage and/or resistance values be for the three wires to each sensor? Should one of them go to ground? Should any of the others?

I'm sort of at a loss as to how to begin. I suppose I could take off both bumpers and visually inspect the wiring but that's a lot of investment for possibly no return. Any direction is much appreciated.

-JT

Mister Bally

I have had a wire break on the harness for the front sensors. I believ it was caused by a tap onto another bumper or object that pinched the harness eventually causing the wire to break. Years ago I posted how I repaired it withouit pulling the fascia off but it was a royal PITA and took me three hours with a soldering iron. This was prior to my first timing belt job and once I pulled the fascia off, the harness was properly repaired.

My error code was for one particular sensor though which led me to where in the harness I had to repair.

If you determine that it is a front sensor, remove the front fascia, it is not that hard to do.

powderlvr

Hello,

I had a wire break once too but VCDS told me which sensor was at fault. Tracing back the wiring for that sensor I was able to find the break and fix it. Simple job. But this new error is not as helpful. It doesn't tell me where the problem is; therefore, I don't know where to start. Is it front or back? Is it a problem with the wiring for a individual sensor or is it something else? I simply don't know.

-JT

mishar

Those two codes are actually one, luck of power to the sensors. Parking-Aid Sensors are connected only to the Parking Aid Control Module (no direct + or - connections). I would check power supply to the module. Red/yellow and black/yellow wires should be ~12V.

You can check pin layout here.

powderlvr

Thanks to Mishar I'm making progress.

1) With the front sensors unplugged I get only an error saying that the front sensors are unplugged. The rear sensors work fine, click, and throw no codes. This means that the problem is with the front.

2) I checked every lead to the front sensors for a short to ground; none of them are shorted. This means that, well, nothing is shorted.

I wonder if this has anything to do with the headlight work that the dealer did awhile back? They must have had the headlight out, and so presumably had the front bumper off?

What should I do next? Should I pull off the front bumper and have a look around? I don't see how I can do anything else without pulling the front bumper (e.g. check electrical continuity between sensor plugs and connector at the control module).

-JT