What is pin 30 on a relay?
What is pin 30 on a relay? The purpose of a relay is to automate this power to switch electrical circuits on and off at particular times. 85 and 86 are the coil pins while 30, 87, and 87a are the switch pins. 87 and 87a are the two contacts to which 30 will connect. If the coil is not activated, 30 will always be connected to 87a. What is a PCM relay coil? The PCM relay, also known as the powertrain control module relay, comes with a power relay that provides battery voltage to the right PCM circuits. This...