F355 HVAC ECU | Page 11 | FerrariChat

F355 HVAC ECU

Discussion in '348/355' started by baschul, Jun 28, 2016.

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  1. WATSON

    WATSON Two Time F1 World Champ
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    Sep 9, 2010
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    Do we know what the other 5 chips control? More curiosity than anything.
     
  2. Qavion

    Qavion F1 World Champ
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    I'm not sure of the orientation of the HVAC ECU connector.

    Cedrik, if you're checking wiring at the HVAC ECU, can you confirm that the live battery power wire (brown) is in the top left hand corner of the yellow plug (as viewed from the socket side)

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    It may be in any of the corners.
     
  3. Qavion

    Qavion F1 World Champ
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  4. Qavion

    Qavion F1 World Champ
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  5. WATSON

    WATSON Two Time F1 World Champ
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    So:
    1 = unknown
    2 = Blower Fan Motor
    3 = Electric Water Pump
    4 = Re circulation Flap Motor
    5 = Air Distribution Motor
    6 = Heater Control Valve

    Any idea what chip #1 does?
     
  6. Qavion

    Qavion F1 World Champ
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    Not really. The chip seems to be associated with the control panel.

    The white ECU plug in @Zamboniman308 's diagram has pins labelled A thru M. The OEM wiring diagrams are labelled 1~13. Assuming A = 1, B = 2, etc, the H and I pins would correspond to OEM pins 8 and 9. These are hooked up to pins 4 and 5 on the HVAC control panel. They may have something to do with STOP/RECIRC control. I got some pretty strange results when I was carrying out resistance checks on pins 4 and 5. It wasn't clear what the signals represented.
     
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  7. johnk...

    johnk... F1 World Champ
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  8. Qavion

    Qavion F1 World Champ
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    All 6 ;)
     
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  9. Qavion

    Qavion F1 World Champ
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  10. gatekeeper

    gatekeeper Rookie

    Jun 8, 2021
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    Paul
    Hi,

    I'm going to attempt to replace the op amps on mine, but does anyone have any suggestions on how to remove the hard plastic like film which has been sprayed across the board? I'm tried isopropyl, but it doesn't lift it. I've tried with a screwdriver in the safe area on the bottom right of the photo and it comes off, but needs a gentle amount of force and clearly I can't do this on the main area of the board.

    Thanks

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  11. Zamboniman308

    Zamboniman308 Formula Junior

    Feb 2, 2020
    504
    Chicago IL
    Try a little heat to soften. Its a messy process and takes awhile. I can't remember exactly how it went. You basically need to unsolder the chip. The cleanup is more of the area after you get it removed.

    Equipment that is really helpful is a soldering station for surface mount with hot air. I know i used traditional soldering iron to get the board all cleaned up along with some alcohol and hot air and paste to solder the replacement.
     
  12. johnk...

    johnk... F1 World Champ
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    Google PCB conformal coating removal. Lots of products for it. Depends on type of coating.
     
  13. brendon0

    brendon0 Formula Junior

    Dec 13, 2003
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    Brendon
    Send it to the guy I recommended earlier for doing thr chip replacement he only charged $100 if he is still doing it, sooo worth the money vs hassle.
     
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  14. gatekeeper

    gatekeeper Rookie

    Jun 8, 2021
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    Paul
    Thanks. I've ordered a conformal coating remover pen and will give that a go on a safe area before trying around the chips.

    Unfortunately I'm based in the UK therefore shipping each way can be a pain, along with the re-import tax.
     
  15. johnk...

    johnk... F1 World Champ
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    look for a local electronics repair shop.
     
  16. gatekeeper

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    Paul
  17. Qavion

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  18. yelcab

    yelcab F1 World Champ
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    I recently found a place called connectorexperts.com, they can see your pictures, measurements, and sell you pins, housing, and removal tools.
     
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  19. gatekeeper

    gatekeeper Rookie

    Jun 8, 2021
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    Paul
    Thanks

    953736 does seem to be the one and I also can't find anyone that stocks it. I'll just have to modify a right-angled pin PCB one.
     
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