New diagnostic connector cap - doesn't stay on

[db9]

Thanks to all for answering questions.. this is bit of a dumb one..
As part of cleaning things up under the hood I picked up a replacement plug cover (15 pin D shape) (BMW part 12521286052) problem is the cap won't stay on the connector ? is there something missing like a clip? the cover is a "larger" D than the connector body

Car is 84 533i Auto (02/84 build)

[dsmith]

I have had that and put a tiny dab of black rtv on the cap, let dry and it gives a little friction to hold down.

[vinceg101]

I had/have luck with putting one layer of electrical tape around the bottom lip (black or red depending on your flavor). Works like a charm.

[Federico]

IIRC, there should be a couple tiny teeth or protrusions on the flat side of the plug, which hold the cap down.
Mine are broken off letting the cap free, probably the same issue everyone is having.
It might be possible to glue on some bits of plastic to the plug and make it work.

[Federico]

Here's a pic of those little suckers:



10 Bucks ain't too bad:

https://www.ecstuning.com/b-genuine-bmw ... 521273100/

[Federico]

So, today I went ahead and replaced the diagnostic plug on my 528i

The round terminals have double tabs, like so:



So, I made myself a little tool using a round brass terminal. It was just slightly too large in diameter and I used a dremel cutting wheel to widen the "gap" and be able to close the cylinder until it fit the plug nicely. I also sharpened it so that it would slide over the terminal to be removed.



Once set in place, a small screwdriver was used to push the terminal out the bottom.



It's a done deal:





Made myself a schematic just in case

[Federico]

I do notice that with a new plug and cap, the latter doesn't really want to come off.

I'm thinking about shaving some plastic off, so that the tabs bend inwards when pulling on the cap, instead of them locking in place. I don't want them to break again.

[JohnH]

I do notice that with a new plug and cap, the latter doesn't really want to come off.

You could just break those locking tabs off

Excellent work Federico. I really like the ejector.