Do first gen BMW ‘smart’ keys fail?

[Magnesiumnitrate]

Welp. Finally got some codes from ISTA and it looks like I’m having communication issues between the CAS & several modules.

I found water in the driver side well so I tracked that to the boot that holds the wires running up into the lift gate above the D pillar. That’s fixed, but still the electrical issues.

All the codes indicate one way transmission issues.



Any thoughts? I’ve pulled the D pillar trim and Im looking around for corrosion or damage. It all looks ok and I can’t change anything by wiggling wires around so I don’t suspect physical loom damage.