Set the multimeter to continuity mode or the lowest ohms range
Identify the relay coil terminals and contact terminals using the relay diagram or datasheet
Measure resistance across the coil terminals
Check for a finite resistance value on the coil
Check for open circuit between coil and contact terminals
Apply the rated voltage to the coil terminals
Listen or feel for the relay click
Measure continuity between common and normally open terminals after energizing
Measure open circuit between common and normally closed terminals after energizing
Remove power from the coil
Measure continuity between common and normally closed terminals after de-energizing
Measure open circuit between common and normally open terminals after de-energizing
Inspect for burned, pitted, or stuck contacts if readings are abnormal
Replace the relay if coil resistance is open, shorted, or contact switching is incorrect