Roof service past error A6A5 and trunk stuck open shells in but not latched

[RobbiZ4]

This hall sensor signal is irritating me as of the beginning of your reports:

There are two hall sensors sitting below the hydraulic ram on the right in the trunk.
Both are candidates for replacement each 10 years, as they may send wrong states due to corrosion inside of the integrated magnets.

Example:



Clear indication are tiny orange points on the housing like on the upper pics:

See #5)

Thread '⌛ E89: Collection of the typical age-related defects in the roof environment'

Sep 9, 2024

Edit

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05.01.2026
Due to it's age, the following faults/signs of wear in the roof area of our Z4 E89 will come up:

1. Salmon-colored relays
   Wearing internal(!) switching contacts on...

• RobbiZ4
• Replies: 10
• Forum: How-To

• 

Can't be detected with ISTA, but sometimes with INPA.

 

[khalidfh]

I will check these two hall sensors.

I went to the workshop for clarification what they exactly did, fearing that technicians would try to program the CTM but the good news they did not.

He offered me free scanning with scan tool and these are the results:










Is that mean I still have connection issue?

 

[RobbiZ4]

There is no electrical issue with these hall sensors, as their intended and required magnetismn is decreasing over time due to internal corrosion.
Nobody can measure it!

Just get it replaced with new ones as recommended. Can be taken from an 1-series E88 for ~20€ each instead of 200€ for the E89 spare part.

 

[Tornado]

Dude, the error says your micro switch on the right is shorted to ground.
Maybe the micro switch is bad -take it out and test it.

Or maybe the line has shorted to the metal in the roof mechanism because the insulation is damaged.

If you have a broken hydraulic hose you need to fix that too.

A new harness looks like the best option -but where can you get one that isn’t too expensive? Unfortunately these cars are rare so you probably can’t buy one from AliExpress for $300…?

 

[khalidfh]

There is no electrical issue with these hall sensors, as their intended and required magnetismn is decreasing over time due to internal corrosion.
Nobody can measure it!

Just get it replaced with new ones as recommended. Can be taken from an 1-series E88 for ~20€ each instead of 200€ for the E89 spare part.

Sorry I was away for work and itwas raining as well so could not work on the car.

I found damaged insulation, I fixed it.

I checked both hall sensors were a bit oily, but no signs of crack or yellow and red spots picture attached.. So shall I replace them?

 

[khalidfh]

Dude, the error says your micro switch on the right is shorted to ground.
Maybe the micro switch is bad -take it out and test it.

Or maybe the line has shorted to the metal in the roof mechanism because the insulation is damaged.

I fixed that broken wire, unplugged connectors and recently, yes you are right, I found damaged insulation.

If you have a broken hydraulic hose you need to fix that too.

A new harness looks like the best option -but where can you get one that isn’t too expensive? Unfortunately these cars are rare so you probably can’t buy one from AliExpress for $300…?

I will replace the whole harness, but later not these days.

 

[RobbiZ4]

I checked both hall sensors (HS) were a bit oily, but no signs of crack or yellow and red spots picture attached.. So shall I replace them?

As you've liked my HS examples in the different other threads, you know what to check.
From the pictures above I'd say no, not required.

Be sure to fix the red wired HS with a zip tie around the ram as it was before! If not, it'll be teared off while moving.

 

[khalidfh]

Can oil leak put the roof in "roof system"?
And what trigger this error?
Shall I reset the CTM? And if so, how?

I Cleared all errors and will connect to ISTA reading life sensors states and manually operate the hardtop from close position to in trunk after release the pressure. This will ensure if there is a short by broken wire or damaged insulation or even if there is a malfunction microswitch or hall sensor.

 

[RobbiZ4]

Can oil leak put the roof in "roof system"?

Don't understand this question. What is "roof system"?

Missing oil reduces the pressure, which finally will lead to a timeout, but not to a permanent error.
Oil level can be checked at the reservoir of the pump.

Can oil leak put the roof in "roof system"?

Forget any messages on the dash, won't help you.

Shall I reset the CTM? And if so, how?

Nonsense.

I Cleared all errors and will connect to ISTA reading life sensors states and manually operate the hardtop from close position to in trunk after release the pressure.

This will ensure if there is a short by broken wire or damaged insulation or even if there is a malfunction microswitch or hall sensor.

IMHO not possible with ISTA. Limited but better with the right bullet column in INPA's hall sensor view.

In addition, INPA presents a view of preconditions. It's worth to get installed.

That was the reason to develop the Y3 Diagnostic System years ago:

Thread '⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)'

Mar 17, 2022

Before it get's lost in the discussion section, I will place a link into this How-To section:



The whole story:

⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)

The 3rd generation of my roof diagnostic system got finished in these days, after a conceptual phase of about 2 years: Just have a look at some pictures on the German ZRoadster forum of the final build phase. 🤣...

z4-forum.com

• RobbiZ4
• Replies: 8
• Forum: How-To

• 

 

[khalidfh]

Don't understand this question. What is "roof system"?

This is the message on my dash....

Missing oil reduces the pressure, which finally will lead to a timeout, but not to a permanent error.
Oil level can be checked at the reservoir of the pump.


Forget any messages on the dash, won't help you.


Nonsense.


IMHO not possible with ISTA. Limited but better with the right bullet column in INPA's hall sensor view.

In addition, INPA presents a view of preconditions. It's worth to get installed.

I installed INPA but still cannot figure out how to use it properly, i.e. activate the motor to latch the rooftop in the trunk and opening the trunk lid.

That was the reason to develop the Y3 Diagnostic System years ago:

Thread '⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)'

Mar 17, 2022

Before it get's lost in the discussion section, I will place a link into this How-To section:



The whole story:

⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)

The 3rd generation of my roof diagnostic system got finished in these days, after a conceptual phase of about 2 years: Just have a look at some pictures on the German ZRoadster forum of the final build phase. 🤣...

z4-forum.com

• RobbiZ4
• Replies: 8
• Forum: How-To

• 

WOW..... That's impressive....
Having reference data and also possible live data with ability to send signal from outside MS....
I recon you can also command the pump to pressure specific line.

This post need concentration and reading every single word...
Thanks Rob...

 

[RobbiZ4]

I installed INPA but still cannot figure out how to use it properly, i.e. activate the motor to latch the rooftop in the trunk

That's a function of the CTM, F6 and then F4.

...and opening the trunk lid.

That's a function of the Junction Box, JBE / JBBF and F6. An activated ignition is required.

 

[khalidfh]

That's a function of the Junction Box, JBE / JBBF and F6. An activated ignition is required.

This is what I found for the JBE. Maybe I don't have the right daten for the E89. I ve just noticed written E70 at the top left corner!!!!

 

[RobbiZ4]

View attachment 287626
This is what I found for the JBE. Maybe I don't have the right daten for the E89. I ve just noticed written E70 at the top left corner!!!!

Correct, E70 is the problem as it doesn't have this locking system.

There is a post in zroadster.com, how to integrate our E89 into INPA...

Z4 E89 Kofferraum über INPA öffnen Lösung

Hallo alle zusammen, das ist mein erster Beitrag hier im Forum. Ich habe mir vor ein paar Wochen einen Z4 3.0i E89 zugelegt und direkt mal im Forum nachgeschaut was es so für Probleme geben kann vor allem bzgl. dem Hardtop und Kofferraum. Die Problematik, dass der Kofferraum nicht mehr...

www-zroadster-com.translate.goog

 

[khalidfh]

That was the reason to develop the Y3 Diagnostic System years ago:

Thread '⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)'

Mar 17, 2022

Before it get's lost in the discussion section, I will place a link into this How-To section:



The whole story:

⌛Y3 & Y4 Roof Diagnostic System (for all convertible & roadster)

The 3rd generation of my roof diagnostic system got finished in these days, after a conceptual phase of about 2 years: Just have a look at some pictures on the German ZRoadster forum of the final build phase. 🤣...

z4-forum.com

• RobbiZ4
• Replies: 8
• Forum: How-To

• 

Reading some posts, I concluded "correct me if I am wrong" that is even if the microswitch is working and shows proper state, small deviation in the voltage reading, CTM could trigger an error and malfunction the operation....
It is continuous reading either high 0.5 V or low 0.2 V. The change in any sensor state, lead to initiation or responsible for the next motion or actuation.

I red also, very little change in microswitch resistance resulted in large change in voltage..... So if improper wire is used to replace broken wire, may cause increasing the resistance and may result in large variation in the voltage reading....

Thats why it is important Y3 diagnostic system and called EKG roof...

 

[RobbiZ4]

This minor glitch you are refering to was an exception and is not the standard.

 

[khalidfh]

Can I latch the rear module? Using ISTA or INPA?

But better if I can solve the issue...all sensors change state while packing the roof to the trunk area. Unless four sensors, video shows moving roof from top to trunk with reading states by ISTA.


Those sensors are:
Rear end module closed, right
Rear end module closed, left
Roof shell 2 closed, right
Roof shell 2 closed, left

When I packed the roof in place at the trunk I latch the roof and the sensor titled "cowl panel locked" changed to "yes". And "cowl panel unlocked" changed to "no"

 

[RobbiZ4]

View attachment 288028
Can I latch the rear module? Using ISTA or INPA?

No.
That's a hydraulic task for the 2 rams on both inner sides of the trunk.

 

[khalidfh]

So why it is flashing and no operation is possible??

I can reach the CTM, what to measure and what is the expected reading?!!!especially for those four sensors
Rear end module closed, right
Rear end module closed, left
Roof shell 2 closed, right
Roof shell 2 closed, left

 

[RobbiZ4]

So why it is flashing ...

Cause it's currently neither completely opened nor closed. It's in-between.

...and no operation is possible??

No idea.

CTM, what to measure and what is the expected reading?!!!especially for those four sensors
Rear end module closed, right
Rear end module closed, left
Roof shell 2 closed, right
Roof shell 2 closed, left

All 4 are not pressed in the following situation:

Each pair of these switches always have to be in sync, means pressed or not. If there is a difference between left & right, the CTM blocks.

 

[khalidfh]

Each pair of these switches always have to be in sync, means pressed or not. If there is a difference between left & right, the CTM blocks.

They are consistent, but during the manual operation of the shells, they did not changed. Do they only changed when cylinders are pressurized and piston reach the limit?