E89 roof relay change

[RobbiZ4]

 

[Smartbear]

Do you know the pin id’s for the inner contacts robbi? I could have a look at mine tomorrow, I’ve read that a 9v battery is enough to energise the relay. Do you know the pins for the pick up coil also?
Rob

 

[RobbiZ4]

There is a drawing directly on the salmon housing.

 

[Smartbear]

There is a drawing directly on the salmon housing.

Ok
I did take pics of my contacts but it’s a little difficult to see

Rob

 

[RobbiZ4]

 

[flybobbie]

I was wondering if Tyco 70a relay could be used.
It would need the pin outs and blade size checking.
Might be more robust carrying the current.

 

[Silverstar]

Wrong pics

Have a look at my example and my openng instruction:

Now you have to remove the housings, bend away the outer contacts, unclip the movable middle parts and take sharp photos of the inner contacts.

I will have a look at mine tomorrow and post some pics.

 

[Smartbear]

I was wondering if Tyco 70a relay could be used.
It would need the pin outs and blade size checking.
Might be more robust carrying the current.

When the railway needed a high DC current carrying relay they sourced ones with palladium contacts to give a longer life and a lower failure rate, i don’t know if that’s possible in this fitment? :?
Rob

 

[Anonymous]

The bmw relay is a tyco 70a relay, it’s an oem variant for bmw..

 

[javis20]

Yes, relay is a Tyco V23134-E52-X344. But this is a special part number for BMW. It could be Tyco part number 2-1393302-2 If we knew the specs for the OEM relay, we could probably find a cross reference.

 

[enzed4]

SMP relay RY-779 looks exactly the same (same diagram on the casing). Wonder if it is?
https://www.amazon.com/Standard-Mot...7MX37W8KPSA&psc=1&refRID=2Y8EKFMPG7MX37W8KPSA

 

[RobbiZ4]

 

[flybobbie]

Comes down to economics verse availability.
As you say the current relay is cheap and readily available.
Just replace at regular say 5 year interval.

I do have some high powered opto isolated solid state relays, but who knows their longevity.

 

[Maniac]

Is this a known issue then? I’ve only seen issues reported with hall sensors previously?

 

[RobbiZ4]

 

[enzed4]

Well, we've discussed several alternatives in the past as well, but

- for each replacement a test period is required of 8-10 years. Even then we won't get a sufficient statistical result, if its really better

- support and availability for alt. types won't last for 10 or more years as the OEMs do

- each different device adds additional risks to this system

- each alternative housing misses the special mounting pins, so we have to change the covers against old ones with the risk to damage sth.

- none of the above topics is worth to think about as long as the OEM ones are available in a tracked quality for only about 16 bucks

- hardly any of the cars will stay in the hand of their current owners for the next 8-10 years. Why to invest into an unknown future, if the current replacement is cheap and easy to handle?

Based on these thoughts, I personally stopped any activity in identifying an alternative relay. Indeed, we already started the development of an electronical relay, but have stopped it due to much too high costs and unknown risks (i.e. handling of 40 amps with a cheap semiconductor) regarding stability of such a solution.

Thank you, I will get the oem relays. They will be much more expensive here, but not as expensive as the cost of fixing a failure...

 

[RobbiZ4]

 

[enzed4]

Thank you, I will get the oem relays. They will be much more expensive here, but not as expensive as the cost of fixing a failure...

Your Amazon links seems to be fine. What about the price difference between a BMW dealer and Amazon in NZ?

Will hopefully find out tomorrow when dealer reopens (public holiday today). Probably not much benefit in posting price here as I think the other NZ members on this forum are all E85/E86 owners, although I guess it could help lurkers or future searches.

 

[Silverstar]

I have taken some photos of one of the relay, it's a bit tricky trying to get a clear shot of the inner contact but I think I have managed it. Heres photos of one relay, I will do the other in a minute. If you need more photos just let me know.

 

[Silverstar]

Heres the other one, do they help?