Front parking sensors

[Spawny lad]

Newbie.
I pulled into the supermarket yesterday and had no bleep from front sensors when very near some bushes.
But on leaving when i put it in reverse the bleeper was on.
Any ideas thanks

 

[markplant]

Fronts aren't normally on all the time, rears activate when put in reverse with also switches on the front the front then turn off when a certain speed is reached,

 

[Spawny lad]

Thanks.
Thats strange.so if i drive up to a wall the front sensors wont work unless i check by putting in reverse. :?

 

[Vonlipvig]

That's correct. You can also press the parking sensor switch which will switch them on. I do that if going forward into somewhere

 

[Spawny lad]

Thankyou.
I thought that switch just switched them off.
And asumed they would be on from start up.
So rears come on from start up but not fronts.
If you want fronts you press the switch ??

 

[MKZ4000]

Don't have an E89 but, on my 4 series that's exactly how it works

 

[Spawny lad]

Thanks .
Thought they were faulty.
Just used and all good.

 

[tintoverano]

That's correct. You can also press the parking sensor switch which will switch them on. I do that if going forward into somewhere

yep, it works like that

 

[markplant]

Thankyou.
I thought that switch just switched them off.
And asumed they would be on from start up.
So rears come on from start up but not fronts.
If you want fronts you press the switch ??

When the car goes into reverse it will switch both front and rear on, as you may need both to park , they will automatically switch off when a certain speed is reached going forward as it thinks you can't be parking anymore.
So if your about to park by driving straight into a space then you'd press the button

 

[DR-Z]

Thanks.
Thats strange.so if i drive up to a wall the front sensors wont work unless i check by putting in reverse. :?

If it didn't work like that, the sensors would activate whenever you came up behind another car, such as at traffic lights or a junction.