Automotive Relay Terminal List

1 = 15 or 86
2 = 85
3 = 30
4 = 87A

1 and TD pulse from negative side of coil (old fuel injection etc.)

15 Live when ignition on

30 Normally main live in

31 Earth

31B Switch earth (ECU etc.)

50 live when starter motor turning (old fuel injection etc.)

85 Control Trigger winding

86 Control Trigger winding

86B Control Trigger winding (ECU switch etc.)

87 normally output, live when relay switch on

87A Normally output, live relay switch off (change over relay, immobilizer)

87B Normally output, second live when relay switch on

Click Here for How to Test Relays

Click Here for How to Repair Relays