Front Heater Relay [Toyota Dyna Y50]

1. Checking relay circuits.

a) check for conductivity between terminals 1 and 3 of the relay.

b) check for continuity between terminals 2 and 4 of the relay.



2. Checking the operation of the relay.

a) connect the battery to terminals 1(+) and 3(-) of the relay.

b) check for conductivity between terminals 2 and 4 of the relay.