X5 stalled/set codes while being inspected!

[andrewwynn]

Like i mentioned earlier. Def get that vaket key first or work out meeting up with the guy with the programmer.

Once you have a second working key then open up your first key and reflow everything.

Three RFID circuit has at least a couple components that are SMD soldered and have solder joints.


You don't need to drill holes like i did but those circles about 2mm from the corner are exactly where to poke pins through to measure the voltage.

The key (pun intended) to figure out if buttons are operating is to watch voltage as you press the buttons. It will drop then recover when you let go.

It's a fairly non invasive test.




If you have a bench power supply you can supply an appropriate amount of current like 20ma



Here's the guts. Notice my oops hole top right where i got the ckt board. I had to repair a trace on the back side. The two pins on the top are 16g steel i used to make alignment pins.



I suspect this is the RFID ckt. I somehow managed to not take a photo of the back of the board but i think there's an antenna in the pcb trace for the remotes. I think the fine winding coil is for charging and maybe also the RFID antenna. (i don't remember if i ever confirmed it).

I reflowed all the solder joints and both my non working keys worked again.

Lost one a year later and another year later second stopped working that's when i bought a factory key and fixed my original key again.

I only kept original as a spare until the car was "totaled". I only used the beautiful new key and it was so new when the car died i kept the key as a keepsake of my first BMW.


–awr–

Using Tapatalk VIP on iPhone