Can anyone tell me what the 4 pin Denso blue 156700-2680 relay is for? It is in an under-hood box next to a grey 5 pin mitsuba rc-5102. Thanks.

 

According to this post on a European based forum, it’s the A/C clutch relay? This is referring to a Civic.

https://www.civinfo.com/forum/honda-...lay-check.html

This reddit post mentions the Denso part number you posted and someone replied that Acura updated the part number, which is the A/C clutch relay part number you see around here. This is referring to an Acura.

https://www.reddit.com/r/autorepair/...7002680_denso/

Hope this helps a bit. Maybe someone else will reply with better knowledge.

 

Thank you 2012fitfan. My bad: the blue denso was actually marked 156700-2780 (not 2680...) I guess I looked up so many Denso numbers, I got confused. Do you think the A05 is still a swap for the 2780 Denso as well? I couldn't find what the difference between -2680 and -2780 might be.