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[Olympia5776]

I've just replaced an after market parking system with a genuine ex Omega Bosch Park pilot system . This system came off an Omega saloon and is now fitted on my estate .
In operation when reverse is engaged the system emitts a single bleep per second irrespective if no obstructions are within range .
When in this mode if you simulate getting closer to an object by placing your hand in front of each sensor the system detects it and responds by increasing the frequency of the bleep until a continious sound is emitted at around 9 inches , as it should .
So my question is , should the system bleep once per second when in operation or should it be silent until an obstruction is detected ?
I had a factory fitted Bosch system on a new Audi  some years ago and it bleeped once when reverse was selected but was then silent until an obstruction was detected , I anticipated that this Bosch system would be the same .
I've googled Park pilot calibration but only found a later system that black wires are snipped , these are not on the earlier ones it would seem.
And on the loom is a fuse but not on the power feed . When powered with the fuse out a steady long bleep is given .With the fuse back in and the terminal disconnected there is no change to the operation. here's a photo of these two items,
 

[Entwood]

Thats NOT a fuse .. its a 350 Ohm (I think) resistor.

If you remove that resistor and then activate the park pilot ... ignition on, select reverse ... it enters a self test mode where it beebs in sequence as it tests  .

[RobG]

and to add, the black/white wire connected to the black one keeps the volume level at "Low", disconnect to increase. 430 Ohm

[Entwood]

The black wires that have a "join" plug are the volume control .. if connected the sound is "soft", if unplugged the sound is "loud" ... all things being relative of course !!

EDIT .. beaten by 6 seconds !! 

[Olympia5776]

Thanks lads .
With the resistor removed the system gives the three secs on three secs off code implying all is well.
One thing I never checked prior to fitting was if there was any identifying marks for the orientation of the sensors . I currently have the sensor to loom plug connection pointing downwards would this have an effect ?
Also is there a link to the source of the info posted ?
The system is bleeping phase 1 of warning , by placing your hand in front of each sensor in turn the system goes into phase 2 ie bleeping at the faster frequency , and then to phase 3 which is continious as you get to approx 10 to 12 inches of the sensor.
Cheers 

[feeutfo]

I've just replaced an after market parking system with a genuine ex Omega Bosch Park pilot system . This system came off an Omega saloon and is now fitted on my estate .
In operation when reverse is engaged the system emitts a single bleep per second irrespective if no obstructions are within range .
When in this mode if you simulate getting closer to an object by placing your hand in front of each sensor the system detects it and responds by increasing the frequency of the bleep until a continious sound is emitted at around 9 inches , as it should .
So my question is , should the system bleep once per second when in operation or should it be silent until an obstruction is detected ?
I had a factory fitted Bosch system on a new Audi  some years ago and it bleeped once when reverse was selected but was then silent until an obstruction was detected , I anticipated that this Bosch system would be the same .
I've googled Park pilot calibration but only found a later system that black wires are snipped , these are not on the earlier ones it would seem.
And on the loom is a fuse but not on the power feed . When powered with the fuse out a steady long bleep is given .With the fuse back in and the terminal disconnected there is no change to the operation. here's a photo of these two items,
 

That's not right, as you suspect, normal operation gives
A single beep on selecting reverse, then silence if no obstruction in range, as you say.

It sounds like its seeing an obstruction(maybe),  if the fault finding procedure is saying no fault.
Do you have a toe bar fitted? Or are the sensors too close to the floor, the rear of the car is too low to the ground, there's an up slope behind the car....? (Mine gives a couple of bleeps as I reverse out of my drive sometimes as the rear wheels drop off a slight dip, with the front wheels still on a slightly higher portion of drive. )

[Olympia5776]

Well I''ve had another look this am , no tow bar fitted so no problem there .
The sensors /bumper sits approx 7degrees off the verticle .When reversing out of the garage down the ramp the Bosch system and the old aftermarket system always caught the ground as the car dipped at the rear on the ramp. Parked up on a level open area the system still bleeps every second as if on phase 1 . It's probable that it's "picking up " the ground which makes me wonder if the mounts for the estate and saloon differ due to different bumper contours  although I'd have thought that unlikely.
The fitting position was determined by the previous sensors although I looked at various omegas with PP installed . I'll get in touch with Bosch to see if different fitting rings are available for this version of the PP but I doubt it .....

[feeutfo]

Can't see anything amiss there tbh.

If elite it might be worth raising the self leveling, then test again?
Or reverse the rear wheels onto a brick under each wheel... ?

Might then be enough to alter the angle of the sensors high enough above the floor?
Guessing a bit tbh.

[RobG]

They look as though they`re mounted a bit low comparing them to this one, could be the angle of pic though

[feeutfo]

Does look that way Rob, going by the second picture here
http://www.omegaowners.com/forum/YaBB.pl?num=1231966157

If the sensors where positioned higher, as Robs pic, I wonder would the sensors sit more level and not "see" the road.

Some experimentation needed to diagnose by the looks...?

[RobG]

It`s not a lot so possibly trolley jack either side and raise rear end by about 10-20mm see what the sensors do then

[Olympia5776]

I've taken the measurements of the fitting rings and will turn up some plastic angled rings to raise the angle of the centre line from the sensors .
Rob , I have that photo you posted but as I said I had to use the holes that I drilled when I fitted a previous system only take them out to 30mm from 23mm so I'm afraid there's no changing their position.......
The angle of the bumper face is the same further up so unless we're right on the cusp of the ultrasonic cone picking up the ground I'd say the 10 to 12mm difference between mine and the other photos wouldn't make that much of a difference .
Anyway , I'll try lifting it with a couple of Jacks and see.
Thanks for the replies lads.