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Battery Power-Up After an Accident

Discussion in 'Model S: Battery & Charging' started by kennybobby, Sep 29, 2014.

  1. kennybobby

    kennybobby Member

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    From the Model S Owners Manual:

    If airbags have inflated, or if your vehicle has been in an accident, always have the airbags, seat belt pre-tensioners and any associated components checked and, if necessary, replaced by Tesla.


    In a collision, in addition to the airbags inflating:
    Doors unlock and the door handles extend.
    Hazard warning lights turn on.
    Interior lights turn on.
    High voltage is disabled.
    To restore Battery power, use the touchscreen to manually power off Model S (see page 4.6), then press the brake to power it back on again.


    And in the First Responders Section:

    Vehicle Owners

    In the event of an accident, follow these instructions



    • Turn off the vehicle

      Roadsters – Turn off the vehicle and remove the key

      Model S – Does not turn off—simply press the "park" button on the end of the gear-selector stalk.

      Tesla vehicles are electric and make no noise even when the powertrain is energized.
    • Non-emergency – Notify Tesla Roadside Assistance at 1-877-798-3752


      Emergency – Dial 911
    • See the Vehicle Ownership Card in your glove box for 24-hour Roadside Assistance information and towing instructions



     
  2. tom66

    tom66 Member

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    The method of restoring battery power does not work on any Model S where the airbags detonate. The pyro fuse needs to be reset. I'm not sure what or where this pyro fuse is, apparently Otmar did reset it for his Vanagon project...
     
  3. kennybobby

    kennybobby Member

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    Tyco part numbers and HV Junction Box

    It looks like Tom was right about the contactors having different current ratings.

    The negative terminal relay 2138922-1 is called out at Tyco as Relay, EV200, contactor #2, while 2138920-1 is an EVC500, contactor #1. P/N 2138923-1 is a restricted part, assembly harness, EVC500 (Tesla). For the RAV4 the part numbers are 2138947-1 for EV200 contactor #1 and 2138948-1 EV200 contactor #2, and 2138949-1 (restricted) is the assembly harness, EVC500 RAV4 (Tesla).

    Inside the HV junction box are 3 fuses, two big contactors like in the pack and what looks like some sort of passive thermal protection terminal block. Sorry no pyro devices to disconnect the pack, just two big normally-open relays. They are both restricted parts 2138957-1 (negative side) and-2, Relay, EVC500 SPST-NO w/Auxillary contacts, 230mm/400mm wire. It looks to me that the junction box has 1 HV input (pack) and 4 HV ports downstream of the contactors (drive inverter, dc-dc, on-board charger, and supercharger), this is just my guess.

    It appears that there is redundancy in isolating the pack with one set of relays inside the pack and another pair external the pack in the hv junction box.

    Not sure where they are used, but 2138908-1,-2,-3,-4 are anti-capillary wires, 18 awg in red, white, yellow, black.
    The RAV4 has some white and black wires with contacts, 2138945-2, 46-2. hvjb.jpg
     
  4. tom66

    tom66 Member

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    I think those are the DC fast charge contactors - they engage the supercharger connection. Otherwise, the connector of the car would always have ~400VDC exposed. Which would be a Bad Thing™.

    Is that from the IHS teardown?
    How do you know if the parts are restricted?
     
  5. kennybobby

    kennybobby Member

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    #5 kennybobby, Oct 1, 2014
    Last edited: Oct 1, 2014
    Yes after looking at it some more, i think you are right about the contactors in the junction box are for connecting the SC to the pack. This photo (shopped) is for a single charger (master only). Tyco indicated the contactors are restricted--i tried to buy some and could not...
     
  6. tom66

    tom66 Member

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    #6 tom66, Oct 1, 2014
    Last edited: Oct 1, 2014
  7. kennybobby

    kennybobby Member

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    Here's what the HVJ Box circuits look like to me, may need some tweaks let me know.
    tesla_hvjbox_schematic.jpeg
     
  8. tom66

    tom66 Member

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    Nice work!
    Is "TPC" the disconnect switch after airbag deployment?
    Could explain "12V Battery Low" fault after contactor opening due to loss of DC-DC power
     
  9. kennybobby

    kennybobby Member

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    That was supposed to be TPD, thermal protection device, an as-yet unidentified black terminal block in the box.

    The pyro disconnect switch is located directly on the 12V battery. There is a thread with a picture.

    i thought it was most excellent that the cables for adding a second charger are already wired up and included in the HVJB.
     
  10. kennybobby

    kennybobby Member

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    Might the battery pack be too far gone?

    The 12v battery measured 1.56. After putting a jumper battery on the front terminal posts it measured 12.85v. A minute later the large screen console came on. The range indicated 0 miles. Tried to access the charge port from the console but it would not open. Something then flashed about battery is charging and showed 78 Amps, then measured again at the 12v battery posts it was now reading 13.8v, which was higher than the jumper battery. (dc-dc turned on?)

    Three error messages: battery too low, car needs service, and battery cannot be charged.

    Do you think this is the bad thing™ ?
     
  11. spaceballs

    spaceballs Member

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    *Note only person experienced with high voltage should only attempt this.
    Do you have access to pack HV terminals? If yes, and you do see HV across the pack (but it's low) you could always try manually charging it with HV bench power supply. It will charge super slow but better than keeping it in such a low SOC.
     
  12. kennybobby

    kennybobby Member

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    Revised HVJB found

    It looks like this single-charger M85 has a different routing of the DC-DC converter cables than the version shown earlier in this thread--the cables exit toward the rear of the box near the feed lines to the motor inverter, whereas the other design exits toward the front right corner. Vin 25xxx
     

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  13. tom66

    tom66 Member

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    Also interesting to see warranty void stickers on the charger. Tesla didn't use to do that on earlier MS.
     
  14. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    Are you sure? I recall seeing them on mine over a year ago.
     
  15. qwk

    qwk Model S P2681

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    That's a GenII charger setup.
     
  16. spaceballs

    spaceballs Member

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    Looks like the same warranty void labels as on the ESS in the Roadsters.
     
  17. kennybobby

    kennybobby Member

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  18. Hasse

    Hasse Member

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    Pyroswitch is located on the 12V battery.
     
  19. Hasse

    Hasse Member

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    ...and it looks like this:

    PSS1
     

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