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      08-04-2018, 03:00 PM   #1
RobbiZ4
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Z4 E89 / 3er E93 / 4er F33/F34 -Urgent recommendation to replace the hardtop relais

Hi guys,

In the German zroadster.com forum we currently had several cars with damaged hydraulic pumps. Today I got one damaged pump as well as the 2 pink relais from one of the forum members for further analysis.



[All content removed due to a link-blocker in this forum]
Cheers
Rob

https://e89.zpost.com/forums/showthread.php?t=1523165

Last edited by RobbiZ4; 08-07-2018 at 01:46 AM.. Reason: added EKG diagram, new title
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      08-04-2018, 10:39 PM   #2
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This is a seminal piece of work. I could not get the links to work. At least the analysis ones. I have an account as well, which I suggest others do. In the meantime, this link got me to your content:

http://www.zroadster.com/forum/index...-jahre.133521/

As I understand it, there are two identical relays you recommend bi-annual changing BMW P/N 12631742690 (https://www.realoem.com/bmw/enUS/sho...02#12631742690)

We have this conversation also going on Spooolstreet.

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Last edited by fmorelli; 08-08-2018 at 01:13 AM..
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      08-05-2018, 01:17 AM   #3
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Morning Filippo,

Thanks for your hint.
I've updatd the 2 faulty analysis links.

It's correct, there are 2 identical pink relais to be replaced regularly to avoid the damage of the very expensive hydraulic pump.
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      08-05-2018, 04:53 AM   #4
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Quote:
Originally Posted by fmorelli View Post
This is a seminole piece of work. I could not get the links to work. At least the analysis ones. I have an account as well, which I suggest others do. In the meantime, this link got me to your content:

http://www.zroadster.com/forum/index...-jahre.133521/

As I understand it, there are two identical relays you recommend bi-annual changing BMW P/N 12631742690 (https://www.realoem.com/bmw/enUS/sho...02#12631742690)

Filippo
So I checked that part number on RealOem and it says its for my car but when I put it on FCPEuro to purchase it, they say it doesn't fit my car. Any idea as to why? I have a 2015 Z4 35i.
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      08-05-2018, 07:31 AM   #5
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Don't worry, the part number
12631742690 is correct.

BMW TeileNr 12631742690
https://www.realoem.com/bmw/de/parts...&q=12631742690
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      08-05-2018, 11:17 AM   #6
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I admit to not having done a lot of research. Where exactly are these relays and are they relatively easy to get to?

Update: I think I just answered my own question. I went and looked. It’s under the floor panel in the trunk, next to the battery.

Last edited by Mayhem; 08-05-2018 at 11:37 AM..
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      08-05-2018, 11:39 AM   #7
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2 new relays: $36
New pump: $3500 (what kind of frickin' pump costs $3500?)

It's a no brainer. Ordered my new relays today. Thanks RobbiZ4 for this awesome post.
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      08-05-2018, 12:00 PM   #8
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Quote:
Originally Posted by jparnes1 View Post
2 new relays: $36
New pump: $3500 (what kind of frickin' pump costs $3500?)

It's a no brainer. Ordered my new relays today. Thanks RobbiZ4 for this awesome post.
Where did you end up ordering from?
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      08-05-2018, 12:12 PM   #9
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Quote:
Originally Posted by Mayhem View Post
Where did you end up ordering from?
FCP Euro
http://www.fcpeuro.com/products/bmw-...ay-12631742690

Use a small screwdriver to release the tabs on the sides of the relays and pull them out. Couldn't be easier.
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      08-05-2018, 01:16 PM   #10
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$2,700 from BMW of Fairfax for the pump, though I hope no one needs one.

On the relays, one can pop the covers and inspect them. My car is a 2011 - paid $30 for two new relays on eBay. I'll swap in new, pull the old ones and inspect them - if good I'll keep them as spares. Know that those relays are used on like 50 BMWs, so good to have in the toolbox.

And .... those relays are known to fail on the other cars as they get older ... been that way for a long time.

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      08-05-2018, 02:16 PM   #11
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Quote:
Originally Posted by jparnes1 View Post
FCP Euro
http://www.fcpeuro.com/products/bmw-...ay-12631742690

Use a small screwdriver to release the tabs on the sides of the relays and pull them out. Couldn't be easier.
Thanks. Ordered from FCP Euro.
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      08-05-2018, 02:56 PM   #12
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Quote:
Originally Posted by Mayhem View Post
I admit to not having done a lot of research. Where exactly are these relays and are they relatively easy to get to?

Update: I think I just answered my own question. I went and looked. It’s under the floor panel in the trunk, next to the battery.
Just have a look at the pictures:
http://www.zroadster.com/forum/index...2#post-2763037
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      08-05-2018, 03:05 PM   #13
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Quote:
Originally Posted by RobbiZ4 View Post
Yes, I found them under a rubber pad next to the battery...
Attached Images
 
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      08-06-2018, 08:56 AM   #14
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Just ordered from BMW Northwest in Takoma, WA
Great price and no charge for shipping.
Relay changer salmon red 12631742690
Quantity:2
Price:$15.72
Shipping & Handling:$0.00
Total:$31.44
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      08-06-2018, 09:47 AM   #15
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Thanks to all

Just wondering if anyone in the USA has known of this relay problem or have actually burned out a motor because of it??
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      08-06-2018, 10:42 AM   #16
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Kinda wondering the same thing. Haven't heard of this specific type of failure on any of the Z4 boards but that certainly doesn't mean it hasn't happened. (how many times are expensive repairs made under warranty by drivers who have no clue what caused their cars to need service and never frequent the forums?)

Anyway I did go ahead and order since the relays are very inexpensive and certainly can't "hurt".
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      08-06-2018, 11:39 AM   #17
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[Content dropped]

Last edited by RobbiZ4; 08-07-2018 at 01:45 AM..
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      08-09-2018, 07:29 AM   #18
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Quote:
Originally Posted by RobbiZ4 View Post
Don't worry, the part number
12631742690 is correct.

BMW TeileNr 12631742690
https://www.realoem.com/bmw/de/parts...&q=12631742690
Thanks. Going to order 2. A couple of questions. How do you know if they are bad or going bad and how often do you think they need to be replaced?
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      08-09-2018, 07:37 AM   #19
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Quote:
Originally Posted by sgt3966 View Post
Thanks. Going to order 2. A couple of questions. How do you know if they are bad or going bad and how often do you think they need to be replaced?
You can't recognize their end of life. Just replace it regularly every 5 years.

The broken pump I've examined was driven by a 9 year old relay, that failed.

Last edited by RobbiZ4; 08-22-2021 at 01:33 AM..
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      08-09-2018, 05:58 PM   #20
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Thanks. Ordered the relays on Amazon. With Prime and free shipping it was cheaper and faster
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      08-09-2018, 08:19 PM   #21
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Quote:
Originally Posted by Romer View Post
Thanks. Ordered the relays on Amazon. With Prime and free shipping it was cheaper and faster
I'm not sure I buy this story, if the relay has enough contact areas / proper rating they should last nearly forever.

If they can't handle the load, I'd go for a better relay or do something about the motor start surge rather than simply replacing under rated relays for a fresh set of under rated relays.

Does anyone have specification on the relays and the actual starting current on the motor?

I have seen faulty motors kill relays. So cause and affect need to be established.
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      08-10-2018, 08:12 PM   #22
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Quote:
Originally Posted by rjahl View Post
I have seen faulty motors kill relays. So cause and affect need to be established.
I thought about that too. But let's clarify: here is the workshop & repair manual:

Quote:
The temperature in the hydraulic pump is measured to avoid the pump
overheating during frequent use of the retractable hardtop. Two cables connect
the temperature sensor ground-free to the convertible top module. A line break
(open circuit) results in a fault code being entered in the fault code memory. At
from a temperature of 90°C, hardtop closing movement already started is
continued up to the secure end position. The movement of the retractable hardtop
is stopped immediately at a temperature of 105°C.
The relays should have be opened before the pump was dead...

----------

By the way, on the video, the relays is tagged 13A...
When i see salmon relays (exact same OEM reference) tagged with 73A.
Wtf?

RobbiZ4 How much your ones was tagged?
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