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360 360 Windshield Wiper Gremlin

Discussion in '360/430' started by Aeron Fout, Dec 6, 2021.

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  1. Aeron Fout

    Aeron Fout Karting

    Nov 21, 2019
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    flyadf
    #1 Aeron Fout, Dec 6, 2021
    My 360 started a weird new habit recently. As soon as I turn the ignition on, the windshield wipers turn on full blast. The lever on the steering column can be used to change the wiper speed, but will not turn them off. I have the wiper motor unplugged at the moment so I can drive the car. I have already replaced the wiper relay, but before I throw any more parts at it, I was wondering if anyone else has seen this issue?


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  2. Qavion

    Qavion F1 World Champ
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    #2 Qavion, Dec 6, 2021
    The 360 wiper system is weird (in general). I'm still trying to understand the wiring for it.

    There could be a faulty Wiper Module (ECU) or a faulty column switch. The switch sends 12 volts (ignition power) from relay 57 behind the RH seat to the Wiper Module on different wires (depending on speed selection).

    You could probably disable the wiper simply by pulling the fuse or relay behind the RH seat (rather than pulling the plug).

    Here's a wiring diagram for the Modena (with an earlier type of Wiper Module). There are wiring variations between cars.

    https://www.dropbox.com/t/2sXbNJW62EcSKg9P

    Link expires in 6 days. Let me know if you need further guidance on wiring analysis.
     
  3. Qavion

    Qavion F1 World Champ
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    #3 Qavion, Dec 6, 2021
    Sorry, had to amend my last message. Relay 57 is behind the RH seat. There is a fuse, however, behind the LH seat (F76).

    NB: Fuse & relay numbers may vary depending on the car. Check your Owners Handbook for the appropriate numbers.
     
  4. Aeron Fout

    Aeron Fout Karting

    Nov 21, 2019
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    #4 Aeron Fout, Dec 7, 2021
    Thank you for the insight. I am going to do some more troubleshooting. If I figure it out, I will post my results here. I never drive the car in the rain, so it’s not an urgent repair. It just gets on my nerves when I know something is broken!


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  5. Qavion

    Qavion F1 World Champ
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    #5 Qavion, Dec 7, 2021
    Power for the steering column wiper switch and the Wiper Module comes from their respective relays. Oddly, the relays are enabled by power from the instrument cluster (for reasons unknown).

    Anyway, the column switch still has to be moved before the Wiper ECU gets a 12 volt activation signal (speed/on). Because of this, I would be leaning towards a faulty switch. If you can access the Wiper Module, check for an (abnormal) permanent 12 volts on the blue (high wiper speed) wire with the ignition on. Module plug pin numbers vary, but the high wiper speed still uses the same colour.

    INT = grey (in conjuction with a resistive input on the brown/green wire)
    SLOW = red/black
    HI = blue
     
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  6. Aeron Fout

    Aeron Fout Karting

    Nov 21, 2019
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    #6 Aeron Fout, Dec 8, 2021
    I have just checked the blue wire going into the wiper ECU, and I am getting 12.2 volts with the ignition switched on and the wiper switch off. This is leading me to believe I have a faulty switch on the column.


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  7. Qavion

    Qavion F1 World Champ
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    #7 Qavion, Dec 8, 2021
    Last edited: Dec 8, 2021
    Sorry to hear that. Those switches can't be cheap (new). Perhaps you have some loose wiring in the column causing power to get to the blue wire.

    If you can get to the column connectors, try disconnecting plug 13E and see if there is still power on the blue wire at the ECU.

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  8. Aeron Fout

    Aeron Fout Karting

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    #8 Aeron Fout, Dec 13, 2021
    Thank you for the diagram. I’m going to work on taking the steering column apart this weekend. I removed the airbag and steering wheel about 2 years ago for refinishing, so it should be a relatively familiar process.

    I managed to find a used replacement wiper switch on eBay for $125. The seller guarantees that it’s in working order. We shall see!


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  9. Ghostdiver

    Ghostdiver Formula 3

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    #9 Ghostdiver, Dec 16, 2021
    Had the same problem...have a brand new relay sitting in the box that wasn't the problem. Ended up replacing the switch assy.
     
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  10. tbakowsky

    tbakowsky F1 World Champ
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    #10 tbakowsky, Dec 17, 2021
    I had to replace an insurment cluster for this exact reason. Test carefully. The cluster acts as a gateway for a number of different operations. The wipers being one of them.
     
  11. Qavion

    Qavion F1 World Champ
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    #11 Qavion, Dec 17, 2021
    Strange. Looking at the wiring diagram, the instrument cluster enables the wiper relays, including relay 57 which provides power to the steering column wiper switch. However, you still need to activate the switch before that power can flow to the Wiper ECU.

    Diagram reposted due to timeout:

    https://www.dropbox.com/t/4l6VgywycbRuCBfI
     

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