⌛ Prepare E88 hall sensors for E89 use

RobbiZ4

RobbiZ4

Senior member
 Munich, Bavaria, Germany
E89 hall sensors (HS) on the hydraulic rams are very expensive as spare parts. Alternatively, E88 hall sensors can be fitted. These HS use the same housing format, but are supplied without connectors.

What is required:

Preparing these E88 hallsensors is easy going: 8) :?
  • Remove the zip tie from the hydraulic ram, that fixes the rear hall sensors plug.
    Take a photo before removing it!
  • Both hall sensors are clipped into the right hydraulic ram in the trunk. You can unmount it by pushing a tiny screwdriver between the ram and the HS housing
  • Shorten the 2 wires of each new hall sensor according to the lenghts of the old hall sensors, they are different
  • Crimp a new male MQS pin on each wire.
  • Twist both wires to get the wiring a bit more compact.
  • Plug both wires into a new housing.
  • Important: pin orientation is according to he old hall sensors - brown to brown, colour to colour!!. One old HS has a yellow wire, the new one is red. Don't mind, just colour to colour.
  • Don't forget to place a new zip tie sorrowly(!) around the hydraulic ram to fix the plug and the 2x2 wires as initially removed.


file.php

Roof fault A691/A696 Hall sensor

Roof fault A696 Hall sensor

The fault appeared on my z4 when opening and closing the roof. On opening the cycle stopped when the roof package went in the boot and the boot lid failed to close. On closing the roof failed the connect with the windscreen. In both circumstances the cycle could be completed by holding down the...
z4-forum.com z4-forum.com
 
Last edited:
RobbiZ4 said:
E89 hall sensors (HS) on the hydraulic rams are very expensive as spare parts. Alternatively, E88 hall sensors can be fitted. These HS use the same housing format, but are supplied without connectors.

What is required:
  • 2 MQS female pins per HS
  • A MQS crimp tool

Preparing these E88 hallsensors is easy going: 8) :?
  • Remove the zip tie from the hydraulic ram, that fixes the rear hall sensors plug. Take a photo before removing it!
  • Both hall sensors are clipped into the right hydraulic ram in the trunk. You can unmount it by pushing a tiny screwdriver between the ram and the HS housing
  • Shorten the 2 wires of each new hall sensor according to the lenghts of the old hall sensors, they are different
  • Crimp a new pin on each wire
  • Twist both wires to get the wiring a bit more compact
  • Plug both wires into a new housing.
  • Important: pin orientation is according to he old hall sensors - brown to brown, colour to colour!!. One old HS has a yellow wire, the new one is red. Don't mind, just colour to colour
  • Don't forget to place a new zip tie sorrowly(!) around the hydraulic ram to fix the plug and the 2x2 wires as initially removed
Click to expand...
So I done this today and still have the same problem. You seem to be “the roof guy”. Could it be a problem with the ram?
 
Once again, this is absolutely not acceptable from my point of view.

It seems, that I always have to explain in every post, what's the difference between a How-To and an individual discussion. This topic is a How-To.


RobbiZ4 said:
This topic is definitely not intended to discuss individual problems or to post unwanted nonsense as before!
Click to expand...

And, to be honest, why did you quote this complete post? That's nonsense.
 
Why not just solder the wires and do away with connectors that could cause more trouble.
Mind you it helps if you can these days get your hands on good solder, not the rubbish from China.
 
flybobbie said:
Why not just solder the wires...
Click to expand...
Well, that's indeed not everybodys hobby and favourite tool.
flybobbie said:
...do away with connectors that could cause more trouble.
Click to expand...
Never had any trouble with these connectors except, anybody already touched it the wrong way. :D
 
I did this yesterday, easy fix and a 30min job to get the roof properly working again.

Call me lazy, but rather than crimping on connectors etc. I simply just chopped off the old connector and soldered the new HS onto it, trimming to the same length as the old sensor cables. Brown to brown, yellow to red. Clip in the HS, fresh cable ties and all done.

Part number for the HS I used was 54347190735 at a cost of £14.30. Far preferable to the £190.74 they wanted for 54377224679.

Picture of the sensor location in case it helps anyone reading this how to guide:
IMG_8448.jpegIMG_8447.jpeg
 
I have the hall sensors and am hoping to tackle this in the next few days. Does anyone have any further photos showing the process?
 
RobbiZ4 said:
What is required:

Preparing these E88 hallsensors is easy going: 8) :?
  • Remove the zip tie from the hydraulic ram, that fixes the rear hall sensors plug.
    Take a photo before removing it!
  • Both hall sensors are clipped into the right hydraulic ram in the trunk. You can unmount it by pushing a tiny screwdriver between the ram and the HS housing
  • Shorten the 2 wires of each new hall sensor according to the lenghts of the old hall sensors, they are different
  • Crimp a new male MQS pin on each wire.
  • Twist both wires to get the wiring a bit more compact.
  • Plug both wires into a new housing.
  • Important: pin orientation is according to he old hall sensors - brown to brown, colour to colour!!. One old HS has a yellow wire, the new one is red. Don't mind, just colour to colour.
  • Don't forget to place a new zip tie sorrowly(!) around the hydraulic ram to fix the plug and the 2x2 wires as initially removed.
Click to expand...
Isn't that exact enough? 🤔
 
Last edited:
Could anyone provide guidance as to how to access the ram in order to remove and replace the hall sensors, I appreciate the instructions but im struggling to see how i gain access to it in the boot.
 
If I recall correctly, I had the boot open from front hinge, like it was about to receive the roof into it. To do this, I just opened the roof halfway then propped the boot open.
 
You must log in or register to reply here.
Back
Top Bottom