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      08-18-2021, 11:00 AM   #23
RobbiZ4
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Quote:
Originally Posted by bryanhoag View Post
Looks like it's paired…

Part numbers:
54377227397 Left
54377227398 Right

Are these correct?

Should both be replaced at the same time?
NO.
NO.


The correct part is "Base plate right", 54377192950


It's position 6 on the following chart:
https://www.realoem.com/bmw/enUS/sho...diagId=54_0413
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      08-18-2021, 11:05 AM   #24
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Quote:
Originally Posted by bryanhoag View Post
@RobbiZ4

How many microswitches are there in total?

Quote:
Originally Posted by RobbiZ4 View Post
2 plus 2 plus 2 plus 1 plus 2 plus 2 (front to back)
Forgot exactly this one Brian fights against:

2 plus 1 plus 2 plus 2 plus 1 plus 2 plus 2 (front to back)
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      08-18-2021, 04:43 PM   #25
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Thanks for all of your input RobbiZ4 ! I have not tried any grease or WD40. Is it easily accessible? How easy is it to replace if it's simply bad?
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      08-18-2021, 05:11 PM   #26
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Also. What does that microswitch trigger or detect?
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      08-19-2021, 02:28 AM   #27
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Quote:
Originally Posted by bryanhoag View Post
Also. What does that microswitch trigger or detect?
As it's name says:
Quote:
Originally Posted by bryanhoag View Post
Microswitch 'cowl panel reached'
It detects the arrival or opening of the front roof shell on the windscreen.
On the black 41-pole plug X13039 of the CTM its connected to the pins 27 and 35.

Documentation:
http://e89.zpost.com/forums/attachme...8&d=1335371623
https://e89.zpost.com/forums/attachm...2&d=1477456021

In the circuit diagram on page 18 you can see, that switch no. 5 containts two resistors. Generally it's 560 ohms in a row an 2.200 ohms in parallel to the switch. You can measure 560 ohms if the switch is closed and 2.760 ohms, if the switch is open. Everything else like zero ohms (there is a short in the wiring before the microswitch) or infinite (a wire is broken/interrupted) is a failure.


BMW Z4 E89 Convertible Base Plate Riught 7192950
https://www.realoem.com/bmw/enUS/par...&mg=&q=7192950
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Last edited by RobbiZ4; 08-19-2021 at 02:43 AM..
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      08-19-2021, 10:55 PM   #28
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Awesome. Thanks Robbi!
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      08-20-2021, 06:34 PM   #29
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RobbiZ4 is the CTM plug and play? Or would a new CTM need to be coded by the dealership?

Thanks!
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      08-21-2021, 08:01 AM   #30
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There are 2 generations of CTMs in use:
2009-spring 2012
2012 til 2019 (the youngest I've seen)

The newer ones only work fine on a hydraulic pump with 4 solenoids on top.
Our elder pumps mounted until spring 2012 only have 3 solenoids.

If you buy a new one from stock, only BMW can re-code it for an elder Z4.
If you buy a used one from i.e. eBay, you have to look at the 4 digits timestamp with WWYY (i.e. 4711 for week 47 on 2011).
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      08-21-2021, 06:14 PM   #31
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RobbiZ4 so if I have a newer Z4 (build date 11/2012) and bought a new CTM or used CTM from a Z4 with the 4 solenoid system, it would not need coding?

Am I understanding you correctly? Thanks!
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      08-22-2021, 01:46 AM   #32
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Quote:
Originally Posted by bryanhoag View Post
RobbiZ4 so if I have a newer Z4 (build date 11/2012)...
You have to count the numbers of the solenoids on top of your pump! 3 or 4?

That's the only criteria, not a date.



In general, there is no coding required.
I always keep 2 spare CTM's in my car for test purposes on other Z4's: an elder one for 3 solenoids and a newer one for 4 solenoid pumps.


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The production week of this CTM is 2812 (week 28/2012). All hardware versions HW 003 AND a software version beginning with this SW number 6.50.00 or higher are designed for the hydraulic pump with 4 solenoids.

Last edited by RobbiZ4; 08-22-2021 at 12:53 PM..
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      08-28-2021, 01:46 AM   #33
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Any update on it?
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      08-30-2021, 07:34 AM   #34
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Haven't received the new CTM to swap yet. I will keep you posted!
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