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Thread: Really weird ignition issue.

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  1. Re: Really weird ignition issue. 
    #11
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    Are you checking the switch with the wire connected to pin 15? I intended for you to check the voltage on it with its wire disconnected.

    When you have the key on and 12 volts present on pin 15, pull off the wire and see whether the 12 volts is on the wire or on the pin.
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    1996 A4 B5 (S2) Avant 1.8T (petrol) 150 bhp code AEB automatic with 79,125 kms = 49,450 miles on 30/07/23
    VW T25 Camper, Alfa 33 1.4 ie, 2 Alfa 33's for parts.
     
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  2. Re: Really weird ignition issue. 
    #12
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    Had to find a pin release tool but I found that it’s the same as before. No voltage present with the key out or in. Only get a supply when turned on. The supply remains when the key is turned to the off position but not removed from the barrel.
     
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  3. Re: Really weird ignition issue. 
    #13
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    Just to be clear in my mind. I was previously visualising wires connected to tabs on the switch, which are easily removed, but I guess your switch is pre-wired, with a multi pin connector - correct?

    If so, let's call one connector half, the one wired to the switch, "A", and the other half, wired to the car loom, "B", and look at the wiring in the circuit to "15" on the starter switch.

    With A and B plugged together, and the "15" wire from the car loom removed from B :-

    You put the key in the switch, turn it to the "ignition on" position and back again, but leave it in. The 12 volts remains on the switch side of the connector, and not on the disconnected wire?

    EDIT:- If this is the case, the connector half coming from the car wiring side may be incorrectly wired, as two similar switches have given the same result.

    OR Both the switches have a similar fault

    OR You have the wrong switches.
    Last edited by FrenchAudi; 30-10-2020 at 01:21 PM. Reason: shown
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    1996 A4 B5 (S2) Avant 1.8T (petrol) 150 bhp code AEB automatic with 79,125 kms = 49,450 miles on 30/07/23
    VW T25 Camper, Alfa 33 1.4 ie, 2 Alfa 33's for parts.
     
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  4. Re: Really weird ignition issue. 
    #14
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    Pin 15 removed from connector. Key in 0v, turned on 12v and back again into off position 12v. Remove key from barrel 0v.
     
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  5. Re: Really weird ignition issue. 
    #15
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    I hadn’t put the probe into the connector where pin 15 was
     
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  6. Re: Really weird ignition issue. 
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    I’ve sorted a photo so we are on the same page! The loom plugs straight into the back of the fuse box apparently is common with vehicles of that era for vw. The spare loom is the identical both ends (fuse box and ignition switch) to the one installed.
    One ignition switch is brand new and the other was the original OE one for the van they both seem to function or cause the fault exactly the same way. Possibly the switches are both wrong but I doubt vw changed them, the part nos are used for heaps of models.
    320DA806-6359-456C-8497-372A54B7E0B5.jpg
     
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  7. Re: Really weird ignition issue. 
    #17
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    OK, so with the switch in place, and the black wire removed from the connector:

    After putting in the key, switching it to the "ignition on" position and back again:

    What is the voltage you measure:-

    1) Between earth and the black wire?

    2) Between earth and the contact at the bottom of the place in the connector from where you removed the black wire?
    Did this forum help you? Help make sure it's here next time! Follow the instructions at the top of the page to make a suitable donation using PayPal .
    1996 A4 B5 (S2) Avant 1.8T (petrol) 150 bhp code AEB automatic with 79,125 kms = 49,450 miles on 30/07/23
    VW T25 Camper, Alfa 33 1.4 ie, 2 Alfa 33's for parts.
     
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  8. Re: Really weird ignition issue. 
    #18
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    So for 1) I still have 12v. 2) no voltage.
     
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  9. Re: Really weird ignition issue. 
    #19
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    There should be no voltage between earth and the black wire when it is disconnected from the switch.

    Try this please:

    Leave the black wire disconnected from the switch.

    1) With the key out, what is the voltage a) from earth to the black wire? b) from earth to where you removed the black wire from?

    2) Put in the key - what are the voltages now at a)? and b)?

    3) Turn the key to "ignition on" - again, what are the voltages now at a)? and b)?

    4) Turn the key to "ignition off" - again, what are the voltages now at a)? and b)?

    5) Remove the key - again, what are the voltages now at a)? and b)?

    Don't get confused. Draw up a list: 1) a) _____ 1) b) _____ ; 2) a) _____ 2) b) _____ ; etc.

    Write down, or have someone write down each voltage as you read it, don't measure a few and then write them down.
    Did this forum help you? Help make sure it's here next time! Follow the instructions at the top of the page to make a suitable donation using PayPal .
    1996 A4 B5 (S2) Avant 1.8T (petrol) 150 bhp code AEB automatic with 79,125 kms = 49,450 miles on 30/07/23
    VW T25 Camper, Alfa 33 1.4 ie, 2 Alfa 33's for parts.
     
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  10. Re: Really weird ignition issue. 
    #20
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    Maybe it would help if I tell you the voltages you should see:

    Leave the black wire disconnected from the switch.

    1) With the key out, what is the voltage
    a) from earth to the black wire? Should be 0
    b) from earth to where you removed the black wire from? Should be 0

    2) Put in the key - what are the voltages now
    at a)? Should be 0
    at b)? Should be 0

    3) Turn the key to "ignition on" - again, what are the voltages now
    at a)? Should be 0
    at b)? Should be 12

    4) Turn the key to "ignition off" - again, what are the voltages now
    at a)? Should be 0
    at b)? Should be 0

    5) Remove the key - again, what are the voltages now
    at a)? Should be 0
    at b)? Should be 0
    Did this forum help you? Help make sure it's here next time! Follow the instructions at the top of the page to make a suitable donation using PayPal .
    1996 A4 B5 (S2) Avant 1.8T (petrol) 150 bhp code AEB automatic with 79,125 kms = 49,450 miles on 30/07/23
    VW T25 Camper, Alfa 33 1.4 ie, 2 Alfa 33's for parts.
     
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