The pins to jumper at the relay [K-38] are 3 and 4 ..
If that works , then relay itself or relay primary circuits...
I do not see an easy access to it, aside from the NSS..
One question we have not asked and prob should have is ' Do you have an after-market remote start device... ??

Anyway, the feed circuits to the realy are where you
are better taking it in..