1997 F355 5.2 Parking Lights Wiring Diagram | Page 2 | FerrariChat
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1997 F355 5.2 Parking Lights Wiring Diagram

Discussion in '348/355' started by C-speed, Jul 26, 2022.

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  1. C-speed

    C-speed Karting

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    #26 C-speed, Jul 28, 2022
  2. C-speed

    C-speed Karting

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    #27 C-speed, Jul 28, 2022
    Ok, so H1 does not have continuity to A9, however, it does have continuity to D3. But H1 doesn't have power when I switch the parking lights on/off.
     
  3. Qavion

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    #28 Qavion, Jul 28, 2022
    This is getting confusing. You mean A9 has continuity to D-3, but A-9 doesn't have continuity to H-1?

    I can't say I've heard of problems with light wiring like this before. I can't think where there might be damage. For problems like this, I use a wire tracker, but the wiring looms get so thick in that area, the wires are impossible to track.
     
  4. C-speed

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    #29 C-speed, Jul 28, 2022
    Correct. H1 from the frunk does NOT have continuity to A9. H1 DOES have continuity to D3. But again, H1 doesn't have switched power with the parking button. I think perhaps the problem is internal of the frunk fuse box between Fuse 13 and the H1 pin?


    Argh :/
     
  5. Qavion

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    #30 Qavion, Jul 28, 2022
    Weird. Are you doing continuity checks with the relay panel plugs still connected?

    Quite possible. I assume, like the footwell panel, the frunk panel can be opened (with some melting of plastic welds) and appropriate circuit board connections resoldered.
     
  6. C-speed

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    #31 C-speed, Jul 28, 2022
    I tried connected and disconnected.

    Hmm, sounds like a lot of work lol. What to do...
     
  7. Qavion

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    #32 Qavion, Jul 28, 2022
    I still can't see how you get continuity between H-1 and D-3 with the H plug disconnected (and continuity checks made through the plug, not the plug socket in the relay panel).
     
  8. C-speed

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    #33 C-speed, Jul 28, 2022
    Last edited: Jul 28, 2022
    Just to clarify, if I unplug the blue H connector from the fuse panel in the frunk, H1 does have continuity to D3. This makes sense since that harness runs through the chassis through the driver side fender somewhere and I assume runs to the fuse panel in the footwell.

    With the H connector plugged into the fuse panel there is still continuity to D3.

    Another option is to jump F4 to H1, then it'll at least be on the correct fuse.
     
  9. Qavion

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    #34 Qavion, Jul 29, 2022
    Last edited: Jul 29, 2022
    Are you using a long piece of spare wire to run from a disconnected H connector to your meter in the footwell area to do your resistance checks?

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    Or are you earthing H-1 to chassis and putting the meter probe (say red) also to a chassis earth.... and then putting the black probe to... where? The disconnected D connector pin 3? In this case, I can see a circuit through the filaments of the RH rear lamps.

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  10. C-speed

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    #35 C-speed, Jul 29, 2022
    I am using a long piece of wire connected to H1 through the DVM to D3. The green wire you have in your diagram.
     
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  11. Qavion

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    #36 Qavion, Jul 29, 2022
    D3 on the footwell panel or D3 on the disconnected D plug?
     
  12. C-speed

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    #37 C-speed, Jul 29, 2022
    I didn't disconnect the D plug from the fuse panel when I checked for continuity from D3 to H1, if that's what you're asking. I only tried with the H plug disconnected. I can try again with it disconnected at both ends.
     
  13. C-speed

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    #38 C-speed, Jul 29, 2022
    Ok, with the H and D plugs unplugged from the fuse panel on both ends, there is NO continuity between H1 and D3. If I plug D back in to the fuse panel and leave H unplugged, there IS continuity between H1 and D3.
     
  14. Qavion

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    #39 Qavion, Jul 29, 2022
    If you test it like this...

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    ... then the only path would be through the yellow wire and the footwell relay panel.
     
  15. C-speed

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    #40 C-speed, Jul 29, 2022
    Yes, check my last post.
     
  16. Qavion

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    #41 Qavion, Jul 29, 2022
    Sorry, crossposted...

    I've forgotten if you re-tested D3 to A9 (to check the relay panel) and A9 to H1 (yellow wire) after the plug mixup.

    And you were testing pin D3 on the panel or on the loose D plug?
     
  17. C-speed

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    #42 C-speed, Jul 29, 2022
    Ok, duh lol. Checking with H unplugged from the fuse panel at H1 from the plug side and D unplugged from the fuse panel at D3 on the fuse panel, there IS continuity.
     
  18. Qavion

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    #43 Qavion, Jul 29, 2022
    So that confirms that your yellow wire is ok. If you can confirm that your footwell panel is ok (D3 panel to A9 panel), then the problem must be an internal frunk relay panel problem.

    Must be getting late there... time for a break?
     
  19. C-speed

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    #44 C-speed, Jul 29, 2022
    Lol ya definitely getting late, been at it all day lol

    With A connector unplugged and D connector unplugged, there is no continuity between A9 panel and D3 panel.

    A9 appears to be a common ground? With A and D plugged into the panel, A9 has continuity with all the pins on plug D except D3.

    Thanks for all your help btw, really appreciate it!
     
  20. Qavion

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    #45 Qavion, Jul 29, 2022
    There should only be one (internal) wire between A9 (panel) and D3 (panel). It's only function is to provide a path for RH rear light power. There are no internal branches.

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    Crazy... Then that means your footwell panel is broken. I would recheck to make sure your meter is on pin 9 on the panel.

    Never check resistance with plugs in unless you're sure what you're checking. In this case, with the plugs in, there are paths through the RH bulbs to the chassis. The ohmmeter current can basically go anywhere from there. The original OEM diagrams sometime don't show all the connections going to a splice, but in this case, there are no undocumented connections.

    Are you relying on a meter that emits a beep to check for "continuity"? Sometimes low ohmage lamp filaments are seen as "continuity" (beep-worthy) rather than as a resistance. It's probably best to look at the ohm value on the meter display.
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  21. C-speed

    C-speed Karting

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    #46 C-speed, Jul 29, 2022
  22. C-speed

    C-speed Karting

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    #47 C-speed, Jul 29, 2022
    Also, I think my car (US model) might be wired differently? Hence the reason why A9 isn't yellow but is gray/black. From my findings, the power distribution is different than your diagram. On mine it appears to go from the frunk fuse 13 > H1 > foot well D3 > RH Rear Parking Light. If this is the case, the problem is between fuse 13 and H1, as fuse 13 has power but H1 does not.

    On my car it doesn't do frunk fuse 13 > H1 > foot well A9 > D3 > RH Rear Parking Light as per your diagram. But regardless, H1 still doesn't have power.
     
  23. Qavion

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    #48 Qavion, Jul 29, 2022
    Last edited: Jul 29, 2022
    I saw your A9 and it was yellow. I think you still have the wrong plug. See red-circled yellow wire in this photo.

    [​IMG]

    Didn't you see my correction in post #17?

    [​IMG]
    The blue plug is "H".

    "A" seems to be a black plug on your car.

    If H1 (frunk) doesn't have power from the fuse, then A9 shouldn't. But hopefully there is continuity between H1 (frunk) and the real A-9.
     
  24. C-speed

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    #49 C-speed, Jul 29, 2022
    OMG! Lol it’s getting way too late for me. 1am now. Yes, I was testing the wrong pins.

    A9 panel and D3 panel DOES have continuity.


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  25. Qavion

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    #50 Qavion, Jul 29, 2022
    Last edited: Jul 29, 2022
    So, now we have the right pins, there are good chances that there is continuity between footwell A9 and frunk H1. This would mean that the frunk panel is indeed faulty.

    If dismantling the frunk panel to carry out repairs is too difficult for you, I would perhaps add a jumper wire between H1 and F4 rather than jumping the wires you mentioned earlier. This would distribute the load on the fuse a little better.

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    At this point, I should probably warn you not to apply power to the car with frunk relay panel I and B connectors disconnected. These provide power to the acceleration sensors for the suspension system (located behind the front bumper). I have this vague recollection that I got a suspension warning light after applying power with this plug disconnected (it may have been coincidence, though, I found a faulty shock actuator shortly after this).

    And on the subject of the frunk panel... I just noticed an interesting relationship between this panel and the footwell panel (regarding plug arrangement and lettering):

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    The top half is virtually identical.
     
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