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Thread: what is Pin 1 (and/or Pin 2) on Relay

  1. #1
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    Default what is Pin 1 (and/or Pin 2) on Relay

    hey smart guys..

    I'm trying to fix my fueling issue on the S3 and walking through the Haynes fix checks (it's actually very nice and easy for simpletons like me).

    How do you know what Pin 1 is (or any pin) on a relay that is not written on it? It does have other numbers, so I just assume the smallest number is the pin 1??

    Numbers written on it (Relay is 167, fuel) are 30, 85, 86 & 87.

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  2. #2
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    What are you trying achieve?


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  3. #3
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    Fault finding fuel issues. Part of the process is the electrical side, so I'm having to check ohms on relay.

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  4. #4
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    30 is unswitched 12V (ie. straight from battery). 87 is the relay output.

    85 and 86 connect to the coil inside the relay and are the trigger lines. So if you stick 12V to 85 and earth 86 (or even other way around), the contacts close between 30 and 87.

    Looking at the photo, the 2 large pins would be 30 and 87 and the two smaller pins would be 85 and 86.

    Current:
    2004 A6 C5 Sedan 3.0 V6 Quattro
    1999 A4 B5 Avant 2.4 V6 (Unreg)

    Retired:
    1990 100 Sedan 2.3
    1991 90 Sedan 2.3
    1999 A4 B5 Sedan 2.4 V6
    2005 A6 4F Sedan 3.2 V6 Quattro

  5. #5
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    Thanks for that. Guide says to stick multimeter between pin 1 and 2 and see redistance...

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  6. #6
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    Relays basically work or they donít. Its a switched state.

    Basically if your seeing power at the fuel pump relay should be fine.

    I would suggest multimeter on terminals at fuel pump, if you see 12v at fuel pump connector and then pull relay and it then drops to zero. Relay is working fine.

    You can also swap with another working relay & see if that solves problem.


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