New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BMW Z4 Forum (E89) > 2009-Current Z4 Forum (E89) General Discussion

Post Reply
 
Thread Tools Search this Thread
      07-31-2021, 11:26 PM   #1
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Top Hall Sensor Question

Hi Everyone (and RobbiZ4 )

Does the hydraulic cylinder on the right side of the trunk have 1 or 2 hall sensors? There appear to be spaces for 2 to clip in.

See image.

Thanks!
Attached Images
 
Appreciate 0
      07-31-2021, 11:27 PM   #2
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Here's an image that appears to show 2 hall sensors clipped in.
Attached Images
 
Appreciate 0
      08-01-2021, 12:08 AM   #3
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

I think I've answered my own question based on another forum. There are 2 hall sensors.

Follow up question. Does a replacement OEM top harness include the hall sensors or are they separate?
Appreciate 0
      08-01-2021, 03:49 AM   #4
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

Hi Bryan,

Yes, there are 2 hall sensors on the right hydraulic cylinder, none on the left.

The front one next to the piston is responsible for the short delay when closing the boot lid. The rear one detects a completely opened boot lid.

None of them is included in the harness, as they do have their own part numbers.
Appreciate 1
      08-01-2021, 05:25 AM   #5
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Thanks Robbi! Great info, as usual.

What does the hall sensor that is on the cylinder in the roof package detect?

I know the last one is in the floor and detects the partition.
Appreciate 0
      08-01-2021, 06:29 AM   #6
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

Quote:
Originally Posted by bryanhoag View Post
What does the hall sensor that is on the cylinder in the roof package detect?
It detects the rear roof shell lying perfectly ON the front shell and initiates the next opening step. Also mounted on the right side only.


Quote:
Originally Posted by bryanhoag View Post
I know the last one is in the floor and detects the partition.
One million dollar question especially for you:

What about the FIFTH hallsensor?
Appreciate 1
      08-01-2021, 06:33 AM   #7
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Thanks again!

I wasn't aware there was a 5th hall sensor… 🤔
Appreciate 0
      08-01-2021, 06:49 AM   #8
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)


YES, there is another one in the boot on the hydraulic cylinder of the right main pillar.
Appreciate 1
      08-01-2021, 08:39 AM   #9
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

And, what does that hall sensor detect?
Appreciate 0
      08-01-2021, 11:34 AM   #10
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

Quote:
Originally Posted by RobbiZ4 View Post

YES, there is another one in the boot on the hydraulic cylinder of the right main pillar.

Quote:
Originally Posted by bryanhoag View Post
And, what does that hall sensor detect?

Of course the position of the main pillar.
Appreciate 0
      08-01-2021, 05:13 PM   #11
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

This makes more sense now. BMW lists 4 hall sensors in the technical manual. But one piece has 2 sensors so it's 5 in total.
Appreciate 0
      08-01-2021, 06:11 PM   #12
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

@RobbiZ4

Has anyone ever written out the full opening and closing sequences detailing what is happening during each part of the process and why (with hall sensor and microswitch triggering, etc)? That would be really valuable info!
Appreciate 0
      08-02-2021, 01:45 AM   #13
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

Quote:
Originally Posted by bryanhoag View Post
This makes more sense now. BMW lists 4 hall sensors in the technical manual. But one piece has 2 sensors so it's 5 in total.
Tbh, this is not quite correct.
There are in total 4 hall sensors mounted on hydraulic cylinders. Each of the same type and partno.

Last edited by RobbiZ4; 08-02-2021 at 04:21 AM..
Appreciate 0
      08-02-2021, 01:46 AM   #14
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

The fifth one is sitting in the boot to detect the position of the luggage compartment. This hall sensor is a completely different part with a partno of its own.

Last edited by RobbiZ4; 08-02-2021 at 04:21 AM..
Appreciate 0
      08-02-2021, 05:39 AM   #15
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Agreed. But, still 5 hall sensors. 4+1

🤪
Appreciate 0
      08-03-2021, 12:41 AM   #16
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

@RobbiZ4

How many microswitches are there in total?
Appreciate 0
      08-03-2021, 01:22 AM   #17
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

2 plus 2 plus 2 plus 1 plus 2 plus 2 (front to back)
Appreciate 1
      08-18-2021, 05:29 AM   #18
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

RobbiZ4 hoping you can shed some light on this.

I have fault code A694. When using the BMW fault decoder, it says:

Microswitch 'cowl panel reached'

Can you explain what this means and what would need to be replaced to fix the fault?

Thanks!
Appreciate 0
      08-18-2021, 05:33 AM   #19
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Maybe these photos help.
Attached Images
  
Appreciate 0
      08-18-2021, 05:34 AM   #20
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Looks like location B, number 3. Is there just one microswitch here or is it paired left and right?
Appreciate 0
      08-18-2021, 05:53 AM   #21
bryanhoag
Private First Class
United_States
32
Rep
172
Posts

Drives: 2013 Z4 sDrive 35i 6MT
Join Date: Jul 2018
Location: Charlotte, NC

iTrader: (0)

Looks like it's paired…

Part numbers:
54377227397 Left
54377227398 Right

Are these correct?

Should both be replaced at the same time?
Appreciate 0
      08-18-2021, 11:55 AM   #22
RobbiZ4
Call me "Dr. Bob"
RobbiZ4's Avatar
Germany
77
Rep
229
Posts

Drives: BMW Z4 E89 sDrive 30i
Join Date: Jan 2018
Location: Munich, Bavaria (Home of BMW)

iTrader: (0)

Quote:
Originally Posted by bryanhoag View Post
RobbiZ4 hoping you can shed some light on this.

I have fault code A694. When using the BMW fault decoder, it says:

Microswitch 'cowl panel reached'

Can you explain what this means and what would need to be replaced to fix the fault?

Thanks!
Fault code numbers can be checked against this web database:


https://bmwfault.codes/


From the result list take the explanation for the correct ECU, in our case "ctm_89".


You have identified the correct description and the correct location B.
It's the microswitch on top of the windshield on the right. There is only one microswitch, not a pair.


Issues with this microswitch are very very rare, so I'm wondering what might have happen to it?
Any experiments with grease, oil or WD40 on it??
Appreciate 1
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 04:38 AM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST