Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

Another owner sent in his old Main Relay for re-soldering.

He bought new one from me several years ago and just wanted to
have backup for emergency usage.
The mechanical relays inside the old one were from WK23-26 of 1991 so
they were the old spec with mechanical spring.
The later spec has metal plate spring instead.








The famous soldering crack at several joints.

It’s triggered by several factors such as the size of the through hole,
circuit board material, amount of solder used, vibration, mounting method,
temperature, age, etc so you can’t predict when it will happen.

This issue is not just specific for NSX but also happens on many other
Honda/Acura models.
For NSX, Honda didn’t make any changes to the relay spec so even you
replace it with the new one, the same issue will happen eventually.

There were even several reports of replacement new relays failing
within just after 2 years!!


Re-soldering won’t fix all of the issues because there were several cases
reported with burnt relay contacts as well.
The internal relay capacity itself was not big enough under certain conditions.
It’s the same reason for the EPS controller with error code #22.




Re-soldered and cleaned all joints carefully.

If you just re-solder them without knowing the actual cause of the issue,
you will end up with solder just covering the surface with big air gap underneath.
Therefore, you need to re-solder it in specific way with proper temperature control.




Applied conformal coating for added protection and ready to be returned to the owner.

Kaz