How To Repair Fault With Parking Distance Control On Bmw 728i - E38

TIMM'S BMW E38
PARK Distance Command (PDC) REPAIR

If you accept PDC fitted but all it does is give a long 'beeeeeeeeeeep' when reverse is selected so y'all about likely have a PDC sensor that has fizzled out. I heard a long while ago that you can hear them click when they are working, so, ignition ON (don't start the engine) and press the 'PDC' push button. As long equally information technology is reasonably quiet solar day you lot can hear the sensors clicking by sticking your ear right up to each sensor.

Some sensors are slightly louder than others but it is reasonably like shooting fish in a barrel to tell which ones are working and which ones aren't.

OK, then I take ane dud at the front and 1 dud at the rear. I must say that I didn't fancy this i just it was a LOT easier than expected. This is how the rear trim comes off:

The TIS calls for a 'Hardwood wedge', well, half of Gypsy Roses' dress peg seemed to do the play a joke on. I simply wedged information technology in there and the black rubbery trim along with the chrome top-strip came out nicely. There are around 8 clips meridian and bottom, they just pull out, here's the trim half off:

Before we become any further, this is what a PDC sensor looks similar:

They are Part # 66-21-6-902-182 from BMW and ordinarily effectually �48, as usual Ebay came upwardly with a couple of new ones for a lot less!

I thought these things merely poked into the rubbery trim but of class, being a BMW they actually have a plastic carrier built into the trim:

As you lot can see, this 1 is half out of the carrier and you tin see that the lugs on the side of the PDC clip into securing tabs on the side of the carrier. You lot just open upwardly these tabs a bit and push it out from the front of the sensor (they get a bit gummed in and so a expert poke is required). Once it is out you tin release the PDC sensor from the loom, there is a catch on one side of the connector:

Fit the loom to the new sensor, make sure the little clip is engaged on the connector and simply poke it back in the carrier until information technology goes 'click' and is affluent with the trim.

The trim just pushes back on, make sure you proceed the bottom of the trim a push button quite hard where each clip is, they will snap into position securely. Hither is a picture of what is under the trim, y'all can run into the slots where the clips go in:

The rear sensors are quite easy to do and only take a few minutes. The front end ones are a bit harder simply still reasonably direct-forward.

First, remove the headlight on the corner where the faulty sensor is:

Headlight Removal

Having washed this three times now I can get the headlight off in less than 5 mins! This gives good admission to the back of the PDC sensors. If you take an uncommonly fat arm and then you can remove the headlight carrier which is held on by two bolts. One thing to be careful of is that the carrier looks like it initially sets the headlight mounting position........I would have guessed that the headlight carrier is fitted to the headlight in Product, the headlight fitted to the upper mounts and then the carrier bolted downward, all done before the front end bumper is fitted. So, mark the positions of the fixing before removal so it goes dorsum in the same identify.

Fortunately I have skinny arms:

Information technology is reasonably easy to winkle the PDC sensors out from here once yous know how they unclip, here is the carrier still in place, this must exist glued to the trim in Production and does non come off:

The PDC sensor on the corner trims tin exist reached from here as well, merely ensure that you continue the sensor on the loom until yous supercede information technology, information technology is a lot easier connecting the loom while the sensor is out!