2001 Honda Accord Coupe V6 EX - SRS Light is on! Possible OPDS?

on my honda accord, i have SRS light that is on.



now, Honda has a Service Bulletin out (06-009) for OPDS unit. If OPDS unit is bad, SRS light turns on.



How do i test if it is OPDS unit for sure?



Honda wants me to pay $150 to get the diagnostics if it’s not the OPDS unit.